Fix publish

.dockerignore

@@ -0,0 +1,35 @@
+# Version control
+.git
+.forgejo
+
+# Data volume (never bake in runtime data)
+data/
+
+# Test artefacts (Playwright)
+**/test-results/
+**/playwright-report/
+**/visuals/
+
+# Build artifacts and caches
+**/node_modules/
+**/dist/
+**/.angular/
+**/__pycache__/
+**/.pytest_cache/
+**/.venv/
+
+# Docs (the API spec is the runtime contract — but the image doesn't need it)
+docs/
+*.md
+README.md
+
+# Secrets — never bake into images
+.env
+.env.*
+*.pem
+*.key
+*.crt
+secrets/
+
+# OS artefacts
+.DS_Store

.forgejo/workflows/ci.yml

@@ -0,0 +1,190 @@
+name: CI
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  backend:
+    name: Backend tests
+    runs-on: docker
+    defaults:
+      run:
+        working-directory: backend
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install uv
+        run: |
+          curl -LsSf https://astral.sh/uv/install.sh | sh
+          echo "$HOME/.local/bin" >> "$GITHUB_PATH"
+
+      - name: Set up Python
+        run: uv python install 3.13
+
+      - name: Sync dependencies
+        run: uv sync
+
+      - name: Run pytest
+        run: uv run pytest -v
+
+  frontend-lint:
+    name: Frontend lint
+    runs-on: docker
+    defaults:
+      run:
+        working-directory: frontend
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+          cache: npm
+          cache-dependency-path: frontend/package-lock.json
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run ESLint
+        run: npm run lint
+
+  frontend-test:
+    name: Frontend unit tests
+    runs-on: docker
+    defaults:
+      run:
+        working-directory: frontend
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+          cache: npm
+          cache-dependency-path: frontend/package-lock.json
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run Vitest
+        run: npm test
+
+  frontend-build:
+    name: Frontend build
+    runs-on: docker
+    defaults:
+      run:
+        working-directory: frontend
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+          cache: npm
+          cache-dependency-path: frontend/package-lock.json
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build production bundle
+        run: npm run build
+
+  e2e:
+    name: Playwright e2e
+    runs-on: docker
+    needs: [backend, frontend-build]
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Ensure Docker CLI
+        run: |
+          set -eux
+          if ! command -v docker >/dev/null 2>&1; then
+            DOCKER_VERSION=27.5.1
+            curl -fsSL "https://download.docker.com/linux/static/stable/$(uname -m)/docker-${DOCKER_VERSION}.tgz" \
+              | tar -xz -C /usr/local/bin --strip-components=1 docker/docker
+          fi
+          if ! docker compose version >/dev/null 2>&1; then
+            COMPOSE_VERSION=v2.32.4
+            mkdir -p /usr/local/lib/docker/cli-plugins
+            curl -fsSL "https://github.com/docker/compose/releases/download/${COMPOSE_VERSION}/docker-compose-$(uname -s | tr '[:upper:]' '[:lower:]')-$(uname -m)" \
+              -o /usr/local/lib/docker/cli-plugins/docker-compose
+            chmod +x /usr/local/lib/docker/cli-plugins/docker-compose
+          fi
+          docker --version
+          docker compose version
+
+      - name: Start stack
+        run: docker compose -p life-towers -f docker-compose.dev.yml up --build -d
+
+      - name: Wait for /api/v1/health
+        run: |
+          set -e
+          cid=$(docker compose -p life-towers -f docker-compose.dev.yml ps -q life-towers)
+          for i in $(seq 1 60); do
+            status=$(docker inspect -f '{{.State.Health.Status}}' "$cid" 2>/dev/null || echo starting)
+            if [ "$status" = healthy ]; then
+              echo "stack healthy after ${i} attempts"
+              exit 0
+            fi
+            sleep 2
+          done
+          echo "stack failed to become healthy" >&2
+          docker compose -p life-towers -f docker-compose.dev.yml logs >&2
+          exit 1
+
+      - name: Run Playwright
+        run: |
+          set -eux
+          # Sibling-container (Docker-out-of-Docker) setup: the host daemon can't
+          # see this job's filesystem, so `-v "$(pwd)/frontend:/work"` would mount
+          # an empty dir. Instead create the container, copy the source IN, run,
+          # then copy artifacts back OUT — all via the CLI, which reads/writes the
+          # job container's filesystem.
+          cid=$(docker create \
+            --network life-towers_default \
+            -e PLAYWRIGHT_BASE_URL=http://life-towers:8000 \
+            -e CI=true \
+            mcr.microsoft.com/playwright:v1.60.0-noble \
+            sh -c 'cd /work && npm ci && npx playwright test')
+          # /work does not exist yet, so cp creates it from frontend's contents.
+          docker cp ./frontend "$cid":/work
+          # Run, but always copy artifacts back even when tests fail.
+          set +e
+          docker start -a "$cid"
+          code=$?
+          set -e
+          docker cp "$cid":/work/playwright-report ./frontend/ || true
+          docker cp "$cid":/work/visuals ./frontend/ || true
+          docker rm -f "$cid" >/dev/null 2>&1 || true
+          exit "$code"
+
+      - name: Upload Playwright report
+        if: always()
+        uses: actions/upload-artifact@v3
+        with:
+          name: playwright-report
+          path: frontend/playwright-report
+          if-no-files-found: ignore
+          retention-days: 14
+
+      - name: Upload visual screenshots
+        if: always()
+        uses: actions/upload-artifact@v3
+        with:
+          name: playwright-visuals
+          path: frontend/visuals
+          if-no-files-found: ignore
+          retention-days: 14
+
+      - name: Dump container logs on failure
+        if: failure()
+        run: docker compose -p life-towers -f docker-compose.dev.yml logs
+
+      - name: Tear down stack
+        if: always()
+        run: docker compose -p life-towers -f docker-compose.dev.yml down -v

.forgejo/workflows/docker.yml

@@ -0,0 +1,75 @@
+name: Docker
+
+on:
+  push:
+    branches: [master]
+    tags: ["v*"]
+  workflow_dispatch:
+
+jobs:
+  build-and-push:
+    runs-on: docker
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Docker CLI
+        run: |
+          ARCH=$(uname -m)
+          curl -fsSL "https://download.docker.com/linux/static/stable/${ARCH}/docker-27.5.1.tgz" \
+            | tar xz --strip-components=1 -C /usr/local/bin docker/docker
+          docker --version
+
+      - name: Set up Docker Buildx
+        uses: https://github.com/docker/setup-buildx-action@v3
+        with:
+          driver-opts: |
+            network=host
+
+      - name: Resolve registry vars
+        id: registry
+        env:
+          CONTAINER_REGISTRY_HOST: ${{ vars.CONTAINER_REGISTRY_HOST }}
+        run: |
+          host="${CONTAINER_REGISTRY_HOST:-${{ gitea.server_url }}}"
+          host="${host#https://}"
+          host="${host#http://}"
+          host="${host%/}"
+          if [ "$host" = "forgejo:3000" ]; then
+            host="127.0.0.1:13000"
+          fi
+          repo=$(echo "${{ gitea.repository }}" | tr '[:upper:]' '[:lower:]')
+          owner="${repo%%/*}"
+          {
+            echo "host=${host}"
+            echo "owner=${owner}"
+            echo "image=${host}/${repo}"
+          } >> "$GITHUB_OUTPUT"
+
+      - name: Log in to Forgejo Container Registry
+        uses: https://github.com/docker/login-action@v3
+        with:
+          registry: ${{ steps.registry.outputs.host }}
+          username: ${{ steps.registry.outputs.owner }}
+          password: ${{ secrets.FORGEJO_PACKAGE_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: https://github.com/docker/metadata-action@v5
+        with:
+          images: ${{ steps.registry.outputs.image }}
+          tags: |
+            type=sha,format=short
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+
+      - name: Build and push
+        uses: https://github.com/docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=registry,ref=${{ steps.registry.outputs.image }}:buildcache
+          cache-to: type=registry,ref=${{ steps.registry.outputs.image }}:buildcache,mode=max

.gitignore

@@ -1,46 +1 @@
-# See http://help.github.com/ignore-files/ for more about ignoring files.
+**/__pycache__
-
-# compiled output
-/dist
-/tmp
-/out-tsc
-# Only exists if Bazel was run
-/bazel-out
-
-# dependencies
-/node_modules
-
-# profiling files
-chrome-profiler-events.json
-speed-measure-plugin.json
-
-# IDEs and editors
-/.idea
-.project
-.classpath
-.c9/
-*.launch
-.settings/
-*.sublime-workspace
-
-# IDE - VSCode
-.vscode/*
-!.vscode/settings.json
-!.vscode/tasks.json
-!.vscode/launch.json
-!.vscode/extensions.json
-.history/*
-
-# misc
-/.sass-cache
-/connect.lock
-/coverage
-/libpeerconnection.log
-npm-debug.log
-yarn-error.log
-testem.log
-/typings
-
-# System Files
-.DS_Store
-Thumbs.db

.prettierrc

@@ -1,8 +0,0 @@
-{
-  "printWidth": 120,
-  "singleQuote": true,
-  "useTabs": false,
-  "tabWidth": 2,
-  "semi": true,
-  "bracketSpacing": true
-}

CLAUDE.md

@@ -0,0 +1,291 @@
+# Life Towers — agent notes
+
+This file captures the load-bearing things to know about this codebase. Read it before making non-trivial changes.
+
+## What this is
+
+A personal-productivity TODO app where each user has multiple **pages**, each page holds several **towers** (vertical task columns), and each tower has **blocks** (atomic tasks). Pending blocks live in a **tasks accordion** at the top of the tower; completed ones fall into the tower as colored squares (the "falling animation" is the defining visual). Date-range slider filters which done blocks are visible.
+
+This is a port/modernisation of a legacy Angular 7 app. **Design parity with the legacy is a hard requirement** — the user cares deeply about the original aesthetic. The legacy source lives at `_legacy_reference/` (gitignored) and is the source of truth for any visual question. A detailed style guide is at `docs/DESIGN.md`.
+
+## Repo layout
+
+```
+backend/                 # FastAPI + SQLite (WAL)
+  src/life_towers/
+    main.py              # ASGI app, lifespan, static mount + SPA fallback
+    api.py               # Routes (/api/v1/{health,register,data})
+    auth.py              # Bearer UUIDv4 → user_id
+    db.py                # sqlite3 factory + migration runner
+    limits.py            # slowapi limiter + payload-size middleware
+    models.py            # pydantic v2 schemas
+    logging.py           # structlog JSON
+    migrations/          # 001_initial.sql consolidated schema
+  tests/test_api.py      # pytest + httpx AsyncClient
+  pyproject.toml         # uv-managed
+frontend/                # Angular 21+ standalone, signals, zoneless
+  src/app/
+    components/
+      pages/             # Top-level: page selector + Settings button
+      page/              # Tower row + slider + trash zone + confirm-delete
+      tower/             # White tower card: tasks accordion + add-block + falling stack + name input
+      block/             # Colored square (1/6 tower width)
+      tasks/             # Pending-blocks accordion with tickbox
+      welcome/           # Zero-state intro modal + "Try an example"
+      modal/             # Generic backdrop shell + sub-modals (block-edit carousel, settings, tower-settings)
+      shared/            # select-add, toggle, double-slider, color-picker, icon
+    services/
+      api.service.ts     # HttpClient wrapper, exact API contract
+      store.service.ts   # signal-based store, debounced PUT, retry, loadExample
+      modal-state.service.ts  # global open-modal counter (drag locking)
+    models/index.ts      # Page / Tower / Block / HslColor TS interfaces
+    utils/{color,hash}.ts
+  library/               # Legacy SCSS dropped in verbatim — DO NOT REFACTOR
+  public/assets/         # SVG icons (arrow, pen, plus-sign, trash, x-sign)
+  src/assets/fonts/      # Self-hosted woff2 (Open Sans Condensed, Raleway, …)
+  e2e/                   # Playwright (smoke + visuals)
+docs/
+  api-spec.md            # Single source of truth for the HTTP API contract
+  DESIGN.md              # Legacy visual spec (verbatim SCSS quotes)
+_legacy_reference/       # Original Angular 7 source — read-only, gitignored
+Dockerfile               # Multi-stage: node:22-alpine build → python:3.13-slim runtime
+docker-compose.yml       # Production single-container
+docker-compose.dev.yml   # Ephemeral volume for Playwright runs
+.forgejo/workflows/      # CI + deploy
+```
+
+## Tech stack quickrefs
+
+- **Frontend**: Angular 21+, **standalone components** (no NgModule), `signal()` / `computed()` / `effect()` / `linkedSignal()`, **zoneless change detection** (`provideZonelessChangeDetection`), `@if`/`@for` control flow, **OnPush** everywhere, esbuild builder (`@angular/build:application`), Reactive Forms, Angular Service Worker (PWA), Angular CDK (drag-drop, A11yModule for focus trap)
+- **Backend**: FastAPI, pydantic v2, slowapi (rate limiting), structlog, **sqlite3 with WAL + foreign_keys ON** every connection, uv-managed deps
+- **Runtime topology**: single Docker container — FastAPI process serves both `/api/v1/*` JSON endpoints AND the built Angular SPA as static files with SPA fallback. Behind nginx; uvicorn launched with `--proxy-headers --forwarded-allow-ips=*`
+- **Storage**: SQLite at `/data/life-towers.db` on a named Docker volume. Tree-replace semantics (PUT replaces user's full tree atomically inside `BEGIN IMMEDIATE`)
+
+## Build / dev / test / deploy
+
+```bash
+# Full local stack (ephemeral data)
+docker compose -f docker-compose.dev.yml up --build -d        # http://localhost:8000
+docker compose -f docker-compose.dev.yml down -v              # teardown
+
+# Frontend dev (with backend proxied via proxy.conf.json)
+cd frontend && npm start                                       # ng serve on :4200, /api → :8000
+cd frontend && npm run build                                   # production bundle to dist/frontend/browser/
+cd frontend && npm test                                        # vitest (--run already in the script)
+cd frontend && npm run test:e2e                                # Playwright
+
+# Backend dev
+cd backend && uv sync
+cd backend && uv run pytest -v
+cd backend && uv run uvicorn life_towers.main:app --reload     # :8000
+
+# E2E in the sandbox: host-to-container port forwarding is broken here.
+# Run Playwright INSIDE a container on the docker network instead:
+docker run --rm \
+  --network life-towers_default \
+  -v "$(pwd)/frontend:/work" -w /work \
+  -e PLAYWRIGHT_BASE_URL=http://life-towers:8000 \
+  mcr.microsoft.com/playwright:v1.60.0-noble \
+  npx playwright test
+```
+
+## Design system — the legacy is the source of truth
+
+`docs/DESIGN.md` is the comprehensive spec. Key tokens:
+
+```scss
+// _legacy_reference/frontend/src/library/common-variables.scss
+$accent-color: #a2666f;          // rose
+$text-color:   #5d576b;          // muted purple-grey (also iOS theme-color)
+$light-color:  #ffffff;
+$background-gradient:        linear-gradient(90deg, #fff9e07f 0, #ffd6d67f 100%);  // 50% alpha — modal backdrop
+$background-gradient-opaque: linear-gradient(90deg, #fffcf0 0, #ffebeb 100%);      // body background
+$shadow:        0 0 1.5px 1.5px rgba(0,0,0,0.1), 0 0 3px 2px rgba(0,0,0,0.05);
+$shadow-border: 0 0 0 0.75px rgba(0,0,0,0.1);                                      // hairline
+$normal-font: 'Open Sans Condensed', sans-serif;
+$title-font:  'Raleway', serif;
+$mobile-width: 520px;
+```
+
+Spacing tokens (`library/main.scss`):
+```scss
+:root {
+  --large-padding: 30px;   // 20px on mobile
+  --medium-padding: 15px;
+  --small-padding: 10px;   // 7.5px on mobile
+  --border-radius: 5px;    // 3px on mobile
+}
+```
+
+Font sizes (`library/text.scss`): `--larger/large/medium/small-font-size` = `22/18/16/11` desktop, `20/16/14/10` mobile.
+
+**Animation timings**:
+- `$long-animation-time: 200ms` — opacity, hover transforms, modal entry
+- `$short-animation-time: 100ms` — tighter transitions (red trash-highlight overlay)
+- **Falling animation**: `transform 1.5s cubic-bezier(0.5, 0, 1, 0)` (gravity ease-in)
+- **Modal opacity entry/exit**: `300ms`
+
+## Architectural conventions to follow
+
+### Components
+
+- Every component is **standalone**, **OnPush**, with `signal()`-based local state. No NgModule.
+- Templates use **`@if` / `@for` / `@switch`** — never `*ngIf`/`*ngFor`.
+- Inline templates + inline styles in `@Component({ template: \`...\`, styles: \`...\` })` is the norm. Larger components use templateUrl + styleUrl (only `pages.component`, `page.component`).
+- SCSS inside `styles:` template literal — **`//` comments are fine inside SCSS but watch for backticks**; `// `display: contents`` inside a template literal closes it early. Use `/* */` if you need to mention CSS strings in comments.
+- Library files (`library/*.scss`) are dropped from the legacy verbatim. Don't refactor them. Components `@import '../../../library/main'` (or similar relative depth).
+
+### State
+
+- `StoreService` is the single source of truth (signal-based).
+- Mutations update the signal immediately (**optimistic**) and call `scheduleSave()` which debounces 750ms and PUTs the full tree.
+- Failure mode: exponential backoff up to 5 attempts (1s, 2s, 4s, 8s, 16s).
+- LocalStorage cache key: `life-towers.cache.v4`. Token: `life-towers.token.v4`.
+- `init()` flow: stored token? Use it. No token? Mint via `uuidV4()` → register → GET data. On 401: re-register the SAME token (idempotent server-side), never silently mint a fresh one (would orphan data).
+
+### Reactivity caveats with zoneless
+
+- Plain field mutations in event handlers (`(click)="x = true"`) still trigger CD because Angular's event manager marks the view dirty — even with zoneless. But any async mutation outside an Angular event (setTimeout, raw addEventListener, MutationObserver) **will not** trigger CD; use signals there.
+- `effect()` running on `signal()` reads triggers re-runs; wrap writes in `untracked()` to avoid loops.
+- For input-driven derived state that the user can also override (e.g. `tasks.expanded` seeded from `initiallyOpen` but also clickable), use either `linkedSignal` or `effect()` + a flag (the codebase uses the latter for `tasks.component`).
+
+### Sync model
+
+- **Tree-replace**: `PUT /api/v1/data` sends the entire user hierarchy atomically. Backend wraps in `BEGIN IMMEDIATE`, deletes existing pages (cascading to towers + blocks via FK), inserts new rows. `position` columns track ordering.
+- **No granular endpoints** for individual entity CRUD. Keep it tree-replace.
+- Spec is in `docs/api-spec.md`. Backend pydantic models match it. Frontend `models/index.ts` matches it. Field names are **snake_case** on both sides.
+
+### Backend
+
+- All endpoints are inside `APIRouter(prefix="/api/v1")`. Spec drives behavior — if you change a limit, update both spec and code.
+- Migrations: package data under `src/life_towers/migrations/`, loaded via `importlib.resources.files("life_towers").joinpath("migrations")`. The runner tracks applied state in a `schema_migrations(filename TEXT PRIMARY KEY, applied_at INTEGER)` table.
+- All sqlite connections must do `PRAGMA journal_mode=WAL; PRAGMA foreign_keys=ON; PRAGMA busy_timeout=5000`. The `get_connection()` factory does this.
+- Errors → JSON `{"error": code, "detail": str}` via a single `HTTPException` handler in `main.py`. Stack traces never leak (logged server-side).
+- Rate limits via slowapi: `/register` 30/hour/IP, `GET /data` 60/min/token, `PUT /data` 30/min/token.
+
+## Visual + interaction details that bit me
+
+### Falling animation (tower.component)
+
+The `.block-container` has `transform: scaleY(-1)` so blocks visually fall from the TOP into the bottom of the tower. Each block default-positions at `translateY(500%)` via a `*` rule; the inline `[style.transform]="b._transform"` binding overrides per-block.
+
+When exactly **one** new done block is added, the `reconcile()` method:
+1. Sets the new block's `_transform: 'translateY(500%)'` and `_opacity: '0'` (off-screen)
+2. Calls `requestAnimationFrame` → `requestAnimationFrame` to let the browser paint the initial state
+3. Sets `_anim: 'descend'`, `_transform: 'translateY(0)'`, `_opacity: '1'` — the CSS transition fires
+
+**Critical**: `grewByOne` detection is position-independent (set-difference). When a tickbox flips a pending block to done, the new entry inserts at its original `tower.blocks` index, not appended. Use the new ID, not `styled[length-1]`.
+
+The **date range** slider asymmetry: blocks below `range.from` are removed from `visibleBlocks` entirely (instant shuffle, no gap), blocks above `range.to` get `_anim: 'ascend'` and stay in the list flying up. `prevDoneIds` tracks the full `allDone` array — not the filtered styled list — so range expansions don't mis-fire as "new block".
+
+### Block-edit carousel (modal/block-edit.component)
+
+- Lives at `position: fixed; z-index: 10001` to escape the modal dialog wrapper and cover the viewport
+- Two placeholder cards flank the real cards so the active card can fully center via `scroll-snap-align: center`
+- `.mask` overlay on non-active cards has three tiers: `active opacity 0`, `near-active 0.55`, default `1`. Card opacity also tiered (1 / 0.85 / 0.6) mimicking the legacy `1.33*(1-t/2)` curve
+- Backdrop click (anywhere not a non-placeholder card) closes the modal
+- Delete on an existing card **does not** close the modal — it stays open and the card re-renders out of the list
+- Auto-save on tag/toggle change; description deferred to blur
+
+### Select-add (shared/select-add)
+
+- Has a `.top` chip and a `.bottom` slide-down panel. `:has(.bottom.open) .top, .background { border-radius: var(--border-radius) var(--border-radius) 0 0 }` squares the bottom corners when open so the chip and panel read as one card
+- Shadow seam between chip + panel solved with `clip-path: inset(...)`: `.background.active` clips bottom (`inset(-6px -6px 0 -6px)`), `.bottom.open` clips top (`inset(0 -6px -6px -6px)`). 6px > the total $shadow spread (5px) so neither edge bleeds across the seam
+- Closing animation requires a two-transition setup: default state has `transition: ... visibility 0s $long-animation-time` (visibility delays on close), `.open` overrides with `visibility 0s 0s` (instant on open)
+
+### Modal shell (modal/modal.component)
+
+- `:host { display: contents }` — critical. Without this, the `lt-modal` host element takes a flex slot in `pages.component`'s `inner-spacing` layout, pushing the Settings button up when the modal mounts
+- `section.modal` is `position: fixed; z-index: 10000` with `transition: opacity 300ms`. The component flips `active = true` in `ngAfterViewInit` via `setTimeout(0)` so the opacity 0 → 1 transition runs
+- `ModalStateService.open()` / `.close()` are called in `AfterViewInit`/`OnDestroy`. `page.component` reads `modalState.anyOpen` and binds it to every tower's `[cdkDragDisabled]` so users can't drag towers behind an open modal
+
+### Carousel card date format
+
+```ts
+formatDate(ts: number): string {
+  return new Date(ts * 1000).toLocaleString(undefined, {
+    year: 'numeric', month: 'short', day: 'numeric',
+    hour: '2-digit', minute: '2-digit',
+  });  // "May 28, 2026, 14:32"
+}
+```
+
+### Double-slider relative-time labels
+
+`page.component.ts` formats with `Intl.RelativeTimeFormat(undefined, { numeric: 'auto', style: 'short' })`. Buckets: `<45s` second, `<45min` minute, `<22h` hour, `<26d` day, `<320d` month, else year. Labels are **deduped** by string (multiple distinct timestamps that round to the same "5 hr ago" appear once).
+
+When `values.length` grows (new block added), the slider snaps the **higher** of `oneValue`/`otherValue` to `MAX - 1` so the newest entry is always visible; the lower thumb (the user's left edge) stays put.
+
+### Color picker (shared/color-picker)
+
+- Row of 12 preset color swatches + a rainbow hue slider + a big preview swatch
+- Saturation and lightness are FIXED at 0.7 / 0.55. Only hue varies
+- Preset hues `[0, 15, 30, 45, 195, 215, 235, 255, 280, 310, 335, 355]` — skips the green/yellow zone (60°–180°) which muddies with the rose accent palette
+
+### Tickbox (tasks/tasks.component)
+
+- `✓` glyph is hidden at rest (`opacity: 0`) and only revealed on interaction: `0.85` (hover/focus-visible), `1` (active). It fades via the `opacity` transition
+- The tickbox is a `<button>`, so the global animated-underline bar from `forms.scss` (`button:after { content:''; height: 2px; width: 0→100% on hover; background-color: $text-color }`) applies to it. `all: unset` strips the button's own styling but does NOT reach the pseudo-element — so `.tickbox::after` MUST re-assert `width: 100%; height: 100%; background: none`, otherwise on hover a dark `$text-color` bar paints across the top AND the box collapses to 2px (pinned at `top:0`), which centers the glyph near the top
+- `font: bold 18px/1 $normal-font` is re-asserted on `::after` because `all: unset` drops the font to serif (Times New Roman)
+- `transform: translateY(1px)` nudges the `✓` to optical centre (it sits a touch high in its em-box); `:active` must re-state the translateY or the glyph jumps when pressed
+- `.all-task` is `overflow: hidden` (NOT a scroller) and animates to `#all.scrollHeight`; tall lists scroll in the outer `.container` (`overflow-y: auto; max-height: 30vh`). Making `.all-task` itself `overflow-y: auto` pops a scrollbar the moment the tickbox `scale(1.05)`s on hover (transforms widen the scrollable-overflow box)
+
+### Mobile responsive
+
+- `$mobile-width: 520px` is the single breakpoint
+- Tower row: on mobile, `width: calc(66vw - var(--medium-padding)) !important` per tower with `overflow-x: auto` + `scroll-snap-type: x mandatory`. About 1.5 columns visible by default
+- Carousel cards: `width: 85vw`, placeholders `7.5vw`, carousel `padding: 0 7.5vw` → snap-center lines up perfectly
+- Modal cards (settings/tower-settings/welcome/confirm-delete): `width: 88vw; padding: var(--medium-padding)` on mobile. Confirm-buttons stack vertically with full width
+- Block hover effect (`gravitate`) gated behind `@media (hover: hover) and (pointer: fine)` so touch devices don't get stuck scale-up
+- Viewport meta blocks pinch-zoom: `<meta name="viewport" content="..., maximum-scale=1.0, user-scalable=no" />`
+- `scrollbar-gutter: stable` + `overflow-y: scroll` on `html` so modal opens don't shift content sideways
+
+### Tower drag-drop
+
+- CDK drag-drop on `.towers cdkDropList[orientation=horizontal]`, each tower is `cdkDrag`
+- Trash zone: `<img class="trash">` is OUTSIDE `.towers` (anchored to `page.component :host` at `bottom: 8px; left: 50%`). The legacy structure — moving it inside `.towers` breaks because it becomes a flex item
+- Trash-highlight: `pointerenter` on trash → direct DOM `document.querySelector('.cdk-drag-preview').classList.add('trash-highlight')`. Matches legacy approach
+- Drop over trash → opens a confirm modal (no immediate delete)
+
+### Welcome modal + example data
+
+- Shows when `!store.loading() && store.pages().length === 0`. Auto-dismisses when `pages().length > 0`
+- "Try an example" calls `store.loadExample()` which creates a "Hobbies" page with three towers (Reading, Side projects, Exercise) at varied `created_at` ages so the slider has interesting labels
+
+## Frontend sharp edges
+
+- **`crypto.randomUUID()` requires a secure context** (HTTPS or localhost). On a plain-HTTP origin behind nginx, it throws and `init()` rejects, leaving `loading = true` forever. Always fall back to `crypto.getRandomValues` (`uuidV4()` helper in `store.service.ts`)
+- **Angular 17+ deprecated `fileReplacements`** for env-per-build. Don't use `environment.ts` — use relative API paths everywhere + `proxy.conf.json` for ng serve
+- **Angular 19+ `application` builder copies `public/`, NOT `src/assets/`**. SVG icons must live at `frontend/public/assets/` to be served at `/assets/foo.svg`. Fonts referenced via `url()` in styles.scss go through the CSS asset pipeline and emit to `/media/`
+- **Backticks inside `styles:` template literal** close the string early — break TS parsing
+- **Async iframe-like spawning of agents in this sandbox** (host port forwarding) doesn't work — run e2e via Playwright Docker image on the same `life-towers_default` network
+
+## Backend sharp edges
+
+- The 256 KiB payload cap is enforced by middleware reading `Content-Length`. Chunked encoding bypasses the check. Defense-in-depth would also stream `request.stream()`
+- 10 MiB per-user quota is checked against the request body, NOT the existing user's stored total. With the 256 KiB request cap, the 10 MiB check is effectively unreachable. Documented spec gap
+- The migrations directory was moved to `src/life_towers/migrations/` (inside the package) to ship as `importlib.resources` data — don't recreate `backend/migrations/`
+
+## Visual e2e
+
+- `frontend/e2e/visuals.spec.ts` is the source-of-truth for "what should this look like." It captures ~15 screenshots into `frontend/visuals/` (gitignored)
+- Add a screenshot every time we land a visual change. Don't merge if it broke the visuals run
+- Mobile screenshots use a separate test that spawns its own `browser.newContext({ viewport: { width: 390, height: 844 } })` — that's the iPhone 14 Pro viewport
+
+## Conventions to enforce on changes
+
+- Never use the legacy `frontend-legacy/` or `backend-legacy/` paths — those folders are GONE. `_legacy_reference/` is the reference, gitignored
+- Never refactor `library/*.scss` — those files are dropped verbatim from the legacy and downstream components depend on their exports
+- Never change the API contract in `docs/api-spec.md` without updating both pydantic models, api.py, frontend `models/index.ts`, and the backend tests in `tests/test_api.py`
+- Never put modal-related elements as direct flex children of a layout container without `:host { display: contents }` on the modal — they'll add invisible flex slots
+- Always run `npm run build` after a frontend change to catch TS/template errors that don't surface in the IDE
+- Always run the visuals test after a visual change. Pull the screenshots, look at them, compare to the legacy
+
+## Where to look next
+
+- For the API contract: `docs/api-spec.md`
+- For visual design questions: `docs/DESIGN.md` + `_legacy_reference/frontend/src/library/`
+- For the sync flow: `frontend/src/app/services/store.service.ts` (the `init()`, `flush()`, `scheduleSave()` chain)
+- For the falling animation: `frontend/src/app/components/tower/tower.component.ts:reconcile()`
+- For drag-drop + trash: `frontend/src/app/components/page/page.component.{ts,html,scss}`
+- For deploy: `Dockerfile`, `docker-compose.yml`, `.forgejo/workflows/`

Dockerfile

@@ -0,0 +1,57 @@
+# Stage 1: SPA build
+FROM node:22-alpine AS spa-build
+WORKDIR /build
+COPY frontend/package.json frontend/package-lock.json ./
+RUN npm ci
+COPY frontend/ ./
+RUN npm run build
+# Angular's application builder outputs to dist/frontend/browser/
+
+# Stage 2: runtime
+FROM python:3.13-slim
+
+# Runtime essentials:
+#   curl     — used by HEALTHCHECK
+#   sqlite3  — used for `docker compose exec ... sqlite3` backups
+#   uv       — Python dependency installer
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends curl ca-certificates sqlite3 \
+    && rm -rf /var/lib/apt/lists/* \
+    && pip install --no-cache-dir uv
+
+# Create non-root user with a real shell so `docker exec ... sh` works for ops.
+RUN useradd -r -u 1000 -m -s /bin/sh appuser
+
+WORKDIR /app
+
+# Install backend deps WITHOUT building the project (source not copied yet).
+# The package itself is resolvable via PYTHONPATH=/app/src below; this avoids
+# busting the dep-layer cache on every source change.
+COPY backend/pyproject.toml backend/uv.lock ./
+RUN uv sync --frozen --no-dev --no-install-project
+
+# Backend source (migrations now ship as package data under src/life_towers/)
+COPY backend/src/ ./src/
+
+# SPA static files
+COPY --from=spa-build /build/dist/frontend/browser/ /app/static/
+
+# Persistent data directory + recursive ownership for everything appuser
+# might read or write at runtime.
+RUN mkdir -p /data && chown -R appuser:appuser /data /app
+
+USER appuser
+
+ENV LIFE_TOWERS_DB_PATH=/data/life-towers.db \
+    LIFE_TOWERS_STATIC_DIR=/app/static \
+    LIFE_TOWERS_FORWARDED_ALLOW_IPS=* \
+    PYTHONUNBUFFERED=1 \
+    PYTHONPATH=/app/src \
+    PATH=/app/.venv/bin:$PATH
+
+EXPOSE 8000
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=15s --retries=3 \
+    CMD curl -fsS http://localhost:8000/api/v1/health || exit 1
+
+CMD ["sh", "-c", "uvicorn life_towers.main:app --host 0.0.0.0 --port 8000 --proxy-headers --forwarded-allow-ips=${LIFE_TOWERS_FORWARDED_ALLOW_IPS}"]

README.md

@@ -1,27 +1,98 @@
-# Frontend
+<p align="center">
+  <img src="frontend/public/logo.svg" alt="Life Towers" width="420">
+</p>
 
-This project was generated with [Angular CLI](https://github.com/angular/angular-cli) version 7.3.8.
+A personal productivity tool for organising tasks into visual "towers" of blocks, grouped on pages. Each user is identified by a client-generated token — no accounts, no passwords.
 
-## Development server
+## Architecture
 
-Run `ng serve` for a dev server. Navigate to `http://localhost:4200/`. The app will automatically reload if you change any of the source files.
+The application runs as a single Docker container. A FastAPI process serves both the Angular SPA (as static files) and the JSON API on port 8000. Data is stored in a SQLite database file persisted via a volume mount at `/data`. There is no separate database server required.
 
-## Code scaffolding
+The container is designed to run behind a reverse proxy (nginx, Caddy, Traefik). It honors `X-Forwarded-For`, `X-Forwarded-Proto`, and `X-Forwarded-Host` so rate limiting and logging see the real client IP, and links built with `request.url` produce the correct scheme.
 
-Run `ng generate component component-name` to generate a new component. You can also use `ng generate directive|pipe|service|class|guard|interface|enum|module`.
+## Quick start
 
-## Build
+```bash
+# Local build (uses docker-compose.dev.yml which builds from source and
+# wipes data on `down -v`):
+docker compose -f docker-compose.dev.yml up --build -d
+```
 
-Run `ng build` to build the project. The build artifacts will be stored in the `dist/` directory. Use the `--prod` flag for a production build.
+Then visit http://localhost:8000.
 
-## Running unit tests
+For a production-style run, set `LIFE_TOWERS_IMAGE` to point at your registry tag and use the default `docker-compose.yml`:
 
-Run `ng test` to execute the unit tests via [Karma](https://karma-runner.github.io).
+```bash
+export LIFE_TOWERS_IMAGE=registry.example.com/life-towers:latest
+docker compose pull
+docker compose up -d
+```
 
-## Running end-to-end tests
+## Environment variables
 
-Run `ng e2e` to execute the end-to-end tests via [Protractor](http://www.protractortest.org/).
+| Variable | Default | Description |
+|---|---|---|
+| `LIFE_TOWERS_IMAGE` | `life-towers:local` | The image `docker-compose.yml` will run. Point at your registry tag for production deploys. |
+| `LIFE_TOWERS_PORT` | `8000` | Host port mapped to the container. |
+| `LIFE_TOWERS_PULL_POLICY` | `missing` | `pull_policy` passed to compose. Set `always` to force-pull on `up`. |
+| `LIFE_TOWERS_ALLOWED_ORIGIN` | _(empty)_ | If set, restricts CORS to this origin. Leave empty for same-origin mode (the typical setup behind nginx). |
+| `LIFE_TOWERS_PUBLIC_URL` | _(derived from request)_ | Absolute public URL used for canonical and Open Graph image tags. Set this when serving behind a path prefix or proxy that rewrites the visible URL. |
+| `LIFE_TOWERS_FORWARDED_ALLOW_IPS` | `*` | (Optional, advanced.) Override uvicorn's `--forwarded-allow-ips` if you want to narrow the set of trusted proxies. |
 
-## Further help
+## Data persistence
 
-To get more help on the Angular CLI use `ng help` or go check out the [Angular CLI README](https://github.com/angular/angular-cli/blob/master/README.md).
+SQLite data is stored at `/data/life-towers.db` inside the container, persisted via the `life-towers-data` Docker named volume. Back up with:
+
+```bash
+docker compose exec life-towers sqlite3 /data/life-towers.db .dump > backup.sql
+```
+
+To switch to a host bind mount for easier file-level backups, see the commented line in `docker-compose.yml`.
+
+## Behind nginx
+
+Sample reverse-proxy snippet:
+
+```nginx
+server {
+    listen 443 ssl http2;
+    server_name towers.example.com;
+
+    # SSL config omitted
+
+    client_max_body_size 4m;     # backend enforces 2 MiB; give a small margin
+
+    location / {
+        proxy_pass http://127.0.0.1:8000;
+        proxy_http_version 1.1;
+        proxy_set_header Host              $host;
+        proxy_set_header X-Real-IP         $remote_addr;
+        proxy_set_header X-Forwarded-For   $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_set_header X-Forwarded-Host  $host;
+    }
+}
+```
+
+## Development without Docker
+
+- Backend: `cd backend && uv run uvicorn life_towers.main:app --reload`
+- Frontend: `cd frontend && npm start` — runs `ng serve` on :4200 with `/api/*` proxied to the backend on :8000 (see `frontend/proxy.conf.json`).
+
+## End-to-end tests
+
+A `docker-compose.dev.yml` builds a single-container stack with an ephemeral volume — ideal for Playwright runs:
+
+```bash
+docker compose -f docker-compose.dev.yml up --build -d
+cd frontend && npm run test:e2e          # http://localhost:8000
+docker compose -f docker-compose.dev.yml down -v
+```
+
+`PLAYWRIGHT_BASE_URL` overrides the target (e.g. `http://life-towers:8000` when Playwright itself runs in a container on the same docker network).
+
+## Deployment
+
+Forgejo CI (`.forgejo/workflows/ci.yml`) tests the backend, frontend, production build, and Playwright e2e flow on every push to `master`.
+
+The Docker workflow (`.forgejo/workflows/docker.yml`) builds and pushes images tagged `latest` and `sha-<commit>` on pushes to `master` or manual dispatch. It publishes to `vars.REGISTRY` (default `ghcr.io`) under the repository name, using `secrets.GITHUB_TOKEN` for registry auth.

angular.json

@@ -1,86 +0,0 @@
-{
-  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
-  "version": 1,
-  "newProjectRoot": "projects",
-  "projects": {
-    "frontend": {
-      "root": "",
-      "sourceRoot": "src",
-      "projectType": "application",
-      "prefix": "app",
-      "schematics": {
-        "@schematics/angular:component": {
-          "style": "scss"
-        }
-      },
-      "architect": {
-        "build": {
-          "builder": "@angular-devkit/build-angular:browser",
-          "options": {
-            "outputPath": "dist/frontend",
-            "index": "src/index.html",
-            "main": "src/main.ts",
-            "polyfills": "src/polyfills.ts",
-            "tsConfig": "src/tsconfig.app.json",
-            "assets": ["src/favicon.ico", "src/assets"],
-            "styles": ["src/styles.scss"],
-            "scripts": [],
-            "es5BrowserSupport": true
-          },
-          "configurations": {
-            "production": {
-              "fileReplacements": [
-                {
-                  "replace": "src/environments/environment.ts",
-                  "with": "src/environments/environment.prod.ts"
-                }
-              ],
-              "optimization": true,
-              "outputHashing": "all",
-              "sourceMap": false,
-              "extractCss": true,
-              "namedChunks": false,
-              "aot": true,
-              "extractLicenses": true,
-              "vendorChunk": false,
-              "buildOptimizer": true,
-              "budgets": [
-                {
-                  "type": "initial",
-                  "maximumWarning": "20mb",
-                  "maximumError": "50mb"
-                }
-              ]
-            }
-          }
-        },
-        "serve": {
-          "builder": "@angular-devkit/build-angular:dev-server",
-          "options": {
-            "browserTarget": "frontend:build"
-          },
-          "configurations": {
-            "production": {
-              "browserTarget": "frontend:build:production"
-            }
-
-          }
-        },
-        "extract-i18n": {
-          "builder": "@angular-devkit/build-angular:extract-i18n",
-          "options": {
-            "browserTarget": "frontend:build"
-          }
-        },
-        "lint": {
-          "builder": "@angular-devkit/build-angular:tslint",
-          "options": {
-            "tsConfig": ["src/tsconfig.app.json", "src/tsconfig.spec.json"],
-            "exclude": ["**/node_modules/**"]
-          }
-        }
-      }
-    }
-  },
-  "defaultProject": "frontend"
-}

backend/pyproject.toml

@@ -0,0 +1,33 @@
+[project]
+name = "life-towers"
+version = "0.1.0"
+description = "Life Towers FastAPI backend"
+requires-python = ">=3.11"
+dependencies = [
+    "fastapi>=0.111.0",
+    "uvicorn[standard]>=0.29.0",
+    "slowapi>=0.1.9",
+    "structlog>=24.1.0",
+    "pydantic>=2.0.0",
+]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.hatch.build.targets.wheel]
+packages = ["src/life_towers"]
+
+[tool.hatch.build.targets.wheel.force-include]
+"src/life_towers/migrations" = "life_towers/migrations"
+
+[tool.pytest.ini_options]
+asyncio_mode = "auto"
+testpaths = ["tests"]
+
+[dependency-groups]
+dev = [
+    "pytest>=8.0.0",
+    "pytest-asyncio>=0.23.0",
+    "httpx>=0.27.0",
+]

backend/src/life_towers/__init__.py

@@ -0,0 +1 @@
+# Life Towers FastAPI backend

backend/src/life_towers/api.py

@@ -0,0 +1,251 @@
+from __future__ import annotations
+
+import sqlite3
+import time
+from typing import Annotated
+
+import structlog
+from fastapi import APIRouter, Depends, HTTPException, Request
+
+from .auth import get_current_user
+from .db import db_connection
+from .limits import limiter
+from .logging import token_log_id
+from .models import (
+    BlockOut,
+    DataIn,
+    DataOut,
+    HealthResponse,
+    HslColor,
+    PageOut,
+    RegisterRequest,
+    RegisterResponse,
+    TowerOut,
+)
+
+router = APIRouter(prefix="/api/v1")
+logger = structlog.get_logger(__name__)
+
+
+@router.get("/health", response_model=HealthResponse)
+async def health() -> HealthResponse:
+    return HealthResponse(status="ok")
+
+
+@router.post("/register", response_model=RegisterResponse)
+@limiter.limit("30/hour", key_func=lambda request: request.client.host if request.client else "unknown")
+async def register(request: Request, body: RegisterRequest) -> RegisterResponse:
+    token = body.token
+    now = int(time.time())
+    with db_connection() as conn:
+        existing = conn.execute(
+            "SELECT id FROM users WHERE id = ?", (token,)
+        ).fetchone()
+        if existing is None:
+            conn.execute(
+                "INSERT INTO users (id, created_at, last_seen_at) VALUES (?, ?, ?)",
+                (token, now, now),
+            )
+        else:
+            conn.execute(
+                "UPDATE users SET last_seen_at = ? WHERE id = ?",
+                (now, token),
+            )
+        conn.commit()
+    logger.info("user_registered", user_id=token_log_id(token), new=existing is None)
+    return RegisterResponse(user_id=token)
+
+
+@router.get("/data", response_model=DataOut)
+@limiter.limit("60/minute")
+async def get_data(
+    request: Request,
+    user_id: Annotated[str, Depends(get_current_user)],
+) -> DataOut:
+    with db_connection() as conn:
+        pages_rows = conn.execute(
+            """
+            SELECT id, name, hide_create_tower_button, keep_tasks_open, default_date_from, default_date_to
+            FROM pages
+            WHERE user_id = ?
+            ORDER BY position
+            """,
+            (user_id,),
+        ).fetchall()
+
+        pages_out: list[PageOut] = []
+        for page_row in pages_rows:
+            page_id = page_row["id"]
+
+            tower_rows = conn.execute(
+                """
+                SELECT id, name, base_color_h, base_color_s, base_color_l
+                FROM towers
+                WHERE page_id = ?
+                ORDER BY position
+                """,
+                (page_id,),
+            ).fetchall()
+
+            towers_out: list[TowerOut] = []
+            for tower_row in tower_rows:
+                tower_id = tower_row["id"]
+
+                block_rows = conn.execute(
+                    """
+                    SELECT id, tag, description, is_done, difficulty, created_at
+                    FROM blocks
+                    WHERE tower_id = ?
+                    ORDER BY position
+                    """,
+                    (tower_id,),
+                ).fetchall()
+
+                blocks_out = [
+                    BlockOut(
+                        id=b["id"],
+                        tag=b["tag"],
+                        description=b["description"],
+                        is_done=bool(b["is_done"]),
+                        difficulty=b["difficulty"],
+                        created_at=b["created_at"],
+                    )
+                    for b in block_rows
+                ]
+
+                towers_out.append(
+                    TowerOut(
+                        id=tower_row["id"],
+                        name=tower_row["name"],
+                        base_color=HslColor(
+                            h=tower_row["base_color_h"],
+                            s=tower_row["base_color_s"],
+                            l=tower_row["base_color_l"],
+                        ),
+                        blocks=blocks_out,
+                    )
+                )
+
+            pages_out.append(
+                PageOut(
+                    id=page_row["id"],
+                    name=page_row["name"],
+                    hide_create_tower_button=bool(
+                        page_row["hide_create_tower_button"]
+                    ),
+                    keep_tasks_open=bool(page_row["keep_tasks_open"]),
+                    default_date_from=page_row["default_date_from"],
+                    default_date_to=page_row["default_date_to"],
+                    towers=towers_out,
+                )
+            )
+
+    return DataOut(pages=pages_out)
+
+
+@router.put("/data", status_code=204)
+@limiter.limit("30/minute")
+async def put_data(
+    request: Request,
+    body: DataIn,
+    user_id: Annotated[str, Depends(get_current_user)],
+) -> None:
+    # Tree-replace semantics mean the request size IS the user's total storage,
+    # so the 2 MiB request cap (enforced by payload_size_middleware) is the only
+    # quota we need.
+    now = int(time.time())
+
+    with db_connection() as conn:
+        conn.execute("BEGIN IMMEDIATE")
+        try:
+            # Delete existing data for this user (cascades to towers + blocks)
+            conn.execute("DELETE FROM pages WHERE user_id = ?", (user_id,))
+
+            for page_pos, page in enumerate(body.pages):
+                conn.execute(
+                    """
+                    INSERT INTO pages
+                        (id, user_id, position, name, hide_create_tower_button,
+                         keep_tasks_open, default_date_from, default_date_to,
+                         created_at, updated_at)
+                    VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+                    """,
+                    (
+                        page.id,
+                        user_id,
+                        page_pos,
+                        page.name,
+                        1 if page.hide_create_tower_button else 0,
+                        1 if page.keep_tasks_open else 0,
+                        page.default_date_from,
+                        page.default_date_to,
+                        now,
+                        now,
+                    ),
+                )
+
+                for tower_pos, tower in enumerate(page.towers):
+                    conn.execute(
+                        """
+                        INSERT INTO towers
+                            (id, page_id, user_id, position, name,
+                             base_color_h, base_color_s, base_color_l,
+                             created_at, updated_at)
+                        VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+                        """,
+                        (
+                            tower.id,
+                            page.id,
+                            user_id,
+                            tower_pos,
+                            tower.name,
+                            tower.base_color.h,
+                            tower.base_color.s,
+                            tower.base_color.l,
+                            now,
+                            now,
+                        ),
+                    )
+
+                    for block_pos, block in enumerate(tower.blocks):
+                        created_at = block.created_at if block.created_at is not None else now
+                        conn.execute(
+                            """
+                            INSERT INTO blocks
+                                (id, tower_id, user_id, position, tag,
+                                 description, is_done, difficulty,
+                                 created_at, updated_at)
+                            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+                            """,
+                            (
+                                block.id,
+                                tower.id,
+                                user_id,
+                                block_pos,
+                                block.tag,
+                                block.description,
+                                1 if block.is_done else 0,
+                                block.difficulty,
+                                created_at,
+                                now,
+                            ),
+                        )
+
+            # Update last_seen_at
+            conn.execute(
+                "UPDATE users SET last_seen_at = ? WHERE id = ?",
+                (now, user_id),
+            )
+
+            conn.commit()
+        except sqlite3.IntegrityError as exc:
+            conn.rollback()
+            raise HTTPException(
+                status_code=409,
+                detail="Submitted IDs conflict with existing data",
+            ) from exc
+        except Exception:
+            conn.rollback()
+            raise
+
+    logger.info("data_replaced", user_id=token_log_id(user_id), pages=len(body.pages))

backend/src/life_towers/auth.py

@@ -0,0 +1,55 @@
+"""Bearer token extraction, UUIDv4 validation, and DB lookup."""
+
+from __future__ import annotations
+
+from fastapi import HTTPException, Request
+
+from .db import db_connection
+from .models import _canonical_uuidv4
+
+# Single generic detail used for ALL 401 responses. Per spec, the response
+# must not distinguish between missing / malformed / unknown tokens — that
+# would let an attacker enumerate registered tokens.
+_UNAUTHORIZED_DETAIL = "Authentication required"
+
+
+def _unauthorized() -> HTTPException:
+    return HTTPException(
+        status_code=401,
+        detail={"error": "unauthorized", "detail": _UNAUTHORIZED_DETAIL},
+    )
+
+
+def extract_bearer_token(request: Request) -> str | None:
+    """Return the raw Bearer token from the Authorization header, or None."""
+    auth_header = request.headers.get("Authorization") or request.headers.get(
+        "authorization"
+    )
+    if not auth_header:
+        return None
+    parts = auth_header.split()
+    if len(parts) == 2 and parts[0].lower() == "bearer":
+        return parts[1]
+    return None
+
+
+def get_current_user(request: Request) -> str:
+    """Dependency that extracts and validates a Bearer token, returns user_id."""
+    token = extract_bearer_token(request)
+    if token is None:
+        raise _unauthorized()
+
+    try:
+        token = _canonical_uuidv4(token)
+    except ValueError:
+        raise _unauthorized()
+
+    with db_connection() as conn:
+        row = conn.execute(
+            "SELECT id FROM users WHERE id = ?", (token,)
+        ).fetchone()
+
+    if row is None:
+        raise _unauthorized()
+
+    return token

backend/src/life_towers/db.py

@@ -0,0 +1,95 @@
+"""SQLite connection factory, WAL/FK pragmas, and migration runner."""
+
+from __future__ import annotations
+
+import os
+import sqlite3
+import time
+from contextlib import contextmanager
+from importlib import resources
+from pathlib import Path
+from typing import Generator
+
+import structlog
+
+logger = structlog.get_logger(__name__)
+
+_DB_PATH: Path | None = None
+
+
+def get_db_path() -> Path:
+    global _DB_PATH
+    if _DB_PATH is None:
+        _DB_PATH = Path(os.environ.get("LIFE_TOWERS_DB_PATH", "/data/life-towers.db"))
+    return _DB_PATH
+
+
+def _apply_pragmas(conn: sqlite3.Connection) -> None:
+    conn.execute("PRAGMA journal_mode=WAL")
+    conn.execute("PRAGMA foreign_keys=ON")
+    conn.execute("PRAGMA busy_timeout=5000")
+
+
+def get_connection() -> sqlite3.Connection:
+    """Open a new connection with required pragmas applied."""
+    path = get_db_path()
+    path.parent.mkdir(parents=True, exist_ok=True)
+    conn = sqlite3.connect(str(path), check_same_thread=False)
+    conn.row_factory = sqlite3.Row
+    _apply_pragmas(conn)
+    return conn
+
+
+@contextmanager
+def db_connection() -> Generator[sqlite3.Connection, None, None]:
+    """Context manager yielding a connection that is closed on exit."""
+    conn = get_connection()
+    try:
+        yield conn
+    finally:
+        conn.close()
+
+
+def _migration_files() -> list[tuple[str, str]]:
+    """Return [(filename, sql)] for every migration, in lexical order.
+
+    Migrations ship as package data under `life_towers/migrations/`, so they
+    travel with the wheel and are resolvable regardless of cwd or how the
+    package is installed (editable, wheel, or PYTHONPATH).
+    """
+    pkg_files = resources.files("life_towers").joinpath("migrations")
+    out: list[tuple[str, str]] = []
+    for entry in sorted(pkg_files.iterdir(), key=lambda p: p.name):
+        if entry.name.endswith(".sql"):
+            out.append((entry.name, entry.read_text()))
+    return out
+
+
+def run_migrations(conn: sqlite3.Connection) -> None:
+    """Apply pending SQL migrations in lexical order."""
+    conn.execute(
+        """
+        CREATE TABLE IF NOT EXISTS schema_migrations (
+            filename   TEXT PRIMARY KEY,
+            applied_at INTEGER NOT NULL
+        )
+        """
+    )
+    conn.commit()
+
+    for filename, sql in _migration_files():
+        row = conn.execute(
+            "SELECT filename FROM schema_migrations WHERE filename = ?",
+            (filename,),
+        ).fetchone()
+        if row is not None:
+            continue
+
+        logger.info("applying_migration", filename=filename)
+        conn.executescript(sql)
+        conn.execute(
+            "INSERT INTO schema_migrations (filename, applied_at) VALUES (?, ?)",
+            (filename, int(time.time())),
+        )
+        conn.commit()
+        logger.info("migration_applied", filename=filename)

backend/src/life_towers/limits.py

@@ -0,0 +1,83 @@
+"""Payload size middleware and rate-limit setup."""
+
+from __future__ import annotations
+
+import json
+
+from fastapi import Request, Response
+from slowapi import Limiter
+from slowapi.util import get_remote_address
+
+from .auth import extract_bearer_token
+
+PAYLOAD_LIMIT_BYTES = 2 * 1024 * 1024  # 2 MiB
+
+_TOO_LARGE_BODY = json.dumps(
+    {
+        "error": "payload_too_large",
+        "detail": f"Request body exceeds {PAYLOAD_LIMIT_BYTES} bytes",
+    }
+).encode()
+
+
+def _get_token_or_ip(request: Request) -> str:
+    """Key function for rate limiting: use Bearer token if present, else IP."""
+    return extract_bearer_token(request) or get_remote_address(request)
+
+
+limiter = Limiter(key_func=_get_token_or_ip, default_limits=[])
+
+
+def _too_large() -> Response:
+    return Response(
+        content=_TOO_LARGE_BODY,
+        status_code=413,
+        media_type="application/json",
+    )
+
+
+async def payload_size_middleware(request: Request, call_next) -> Response:
+    """Reject requests larger than PAYLOAD_LIMIT_BYTES.
+
+    Two-layer enforcement:
+      1. If `Content-Length` is present, reject up front (cheap and avoids
+         buffering anything).
+      2. Otherwise (chunked encoding / missing header) wrap `request.receive`
+         so the body stream is tallied as it arrives; abort the moment the
+         running total exceeds the cap. This is defense-in-depth against
+         clients that omit Content-Length.
+    """
+    content_length = request.headers.get("content-length")
+    if content_length is not None:
+        try:
+            length = int(content_length)
+        except ValueError:
+            length = 0
+        if length > PAYLOAD_LIMIT_BYTES:
+            return _too_large()
+        # Trust the declared length; the ASGI server enforces it.
+        return await call_next(request)
+
+    # No Content-Length: tally bytes as they arrive.
+    received_total = 0
+    too_large = False
+    original_receive = request.receive
+
+    async def guarded_receive() -> dict:
+        nonlocal received_total, too_large
+        message = await original_receive()
+        if message.get("type") == "http.request":
+            body = message.get("body") or b""
+            received_total += len(body)
+            if received_total > PAYLOAD_LIMIT_BYTES:
+                too_large = True
+                # Tell downstream "no more body" — they may still try to
+                # parse what's been seen, but we'll override the response.
+                return {"type": "http.disconnect"}
+        return message
+
+    request._receive = guarded_receive  # type: ignore[attr-defined]
+    response = await call_next(request)
+    if too_large:
+        return _too_large()
+    return response

backend/src/life_towers/logging.py

@@ -0,0 +1,66 @@
+"""structlog JSON config and request logging middleware."""
+
+from __future__ import annotations
+
+import time
+import uuid as _uuid_mod
+from hashlib import sha256
+
+import structlog
+from fastapi import Request, Response
+
+from .auth import extract_bearer_token
+
+
+def configure_logging() -> None:
+    """Configure structlog for JSON output."""
+    structlog.configure(
+        processors=[
+            structlog.contextvars.merge_contextvars,
+            structlog.processors.add_log_level,
+            structlog.processors.TimeStamper(fmt="iso"),
+            structlog.processors.StackInfoRenderer(),
+            structlog.processors.JSONRenderer(),
+        ],
+        wrapper_class=structlog.make_filtering_bound_logger(0),
+        context_class=dict,
+        logger_factory=structlog.PrintLoggerFactory(),
+        cache_logger_on_first_use=True,
+    )
+
+
+def token_log_id(token: str) -> str:
+    return sha256(token.encode("utf-8")).hexdigest()[:12]
+
+
+async def request_logging_middleware(request: Request, call_next) -> Response:
+    """Log each request without writing bearer credentials to the log stream."""
+    request_id = str(_uuid_mod.uuid4())
+    structlog.contextvars.clear_contextvars()
+    structlog.contextvars.bind_contextvars(request_id=request_id)
+
+    # Extract user_id from Authorization header for logging (no DB call here)
+    token = extract_bearer_token(request)
+    user_id = token_log_id(token) if token else None
+
+    start = time.monotonic()
+    response = await call_next(request)
+    duration_ms = round((time.monotonic() - start) * 1000, 2)
+
+    # request.client is rewritten by uvicorn's ProxyHeadersMiddleware
+    # (--proxy-headers) to the real client IP when behind a trusted reverse proxy.
+    client_ip = request.client.host if request.client else None
+
+    log = structlog.get_logger("access")
+    log.info(
+        "request",
+        method=request.method,
+        path=request.url.path,
+        status=response.status_code,
+        duration_ms=duration_ms,
+        user_id=user_id,
+        client_ip=client_ip,
+    )
+
+    response.headers["X-Request-Id"] = request_id
+    return response

backend/src/life_towers/main.py

@@ -0,0 +1,227 @@
+from __future__ import annotations
+
+import os
+from contextlib import asynccontextmanager
+from html import escape
+from pathlib import Path
+from typing import AsyncGenerator
+from urllib.parse import urlsplit, urlunsplit
+
+import structlog
+from fastapi import FastAPI, HTTPException, Request, Response
+from fastapi.exceptions import RequestValidationError
+from fastapi.middleware.cors import CORSMiddleware
+from fastapi.responses import FileResponse, HTMLResponse, JSONResponse
+from slowapi import _rate_limit_exceeded_handler
+from slowapi.errors import RateLimitExceeded
+from starlette.middleware.base import BaseHTTPMiddleware
+
+from .api import router
+from .db import db_connection, run_migrations
+from .limits import limiter, payload_size_middleware
+from .logging import configure_logging, request_logging_middleware
+
+logger = structlog.get_logger(__name__)
+
+# Map HTTP status codes to error code strings
+STATUS_CODE_MAP: dict[int, str] = {
+    400: "bad_request",
+    401: "unauthorized",
+    403: "forbidden",
+    404: "not_found",
+    405: "method_not_allowed",
+    409: "conflict",
+    413: "payload_too_large",
+    422: "bad_request",
+    429: "rate_limited",
+    500: "server_error",
+}
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI) -> AsyncGenerator[None, None]:
+    configure_logging()
+    logger.info("starting_up")
+    with db_connection() as conn:
+        run_migrations(conn)
+    logger.info("migrations_complete")
+    yield
+    logger.info("shutting_down")
+
+
+def create_app() -> FastAPI:
+    app = FastAPI(
+        title="Life Towers",
+        lifespan=lifespan,
+        docs_url="/api/docs",
+        redoc_url="/api/redoc",
+    )
+
+    # Rate limiter state
+    app.state.limiter = limiter
+
+    # CORS (only if env var set)
+    allowed_origin = os.environ.get("LIFE_TOWERS_ALLOWED_ORIGIN")
+    if allowed_origin:
+        app.add_middleware(
+            CORSMiddleware,
+            allow_origins=[allowed_origin],
+            allow_credentials=False,
+            allow_methods=["GET", "POST", "PUT", "DELETE", "OPTIONS"],
+            allow_headers=["Authorization", "Content-Type"],
+        )
+
+    # Payload size middleware
+    app.add_middleware(BaseHTTPMiddleware, dispatch=payload_size_middleware)
+
+    # Request logging middleware
+    app.add_middleware(BaseHTTPMiddleware, dispatch=request_logging_middleware)
+
+    # Rate limit exceeded handler
+    app.add_exception_handler(RateLimitExceeded, _rate_limit_exceeded_handler)
+
+    # Pydantic / FastAPI validation errors → 400 bad_request.
+    # We do NOT echo the user-supplied input back in the detail string —
+    # pydantic's default messages include the offending value, which would
+    # reflect arbitrary attacker-controlled content. Instead we just list
+    # the failing field paths.
+    @app.exception_handler(RequestValidationError)
+    async def validation_exception_handler(
+        request: Request, exc: RequestValidationError
+    ) -> JSONResponse:
+        fields = sorted(
+            field
+            for field in {
+                ".".join(str(loc) for loc in e.get("loc", ()) if loc != "body")
+                for e in exc.errors()
+            }
+            if field
+        )
+        if fields:
+            detail_str = "Validation failed for: " + ", ".join(fields)
+        else:
+            detail_str = "Validation failed"
+        return JSONResponse(
+            status_code=400,
+            content={"error": "bad_request", "detail": detail_str},
+        )
+
+    # HTTP exception handler → normalized JSON
+    @app.exception_handler(HTTPException)
+    async def http_exception_handler(request: Request, exc: HTTPException) -> JSONResponse:
+        if isinstance(exc.detail, dict):
+            # Already shaped correctly (from auth.py etc.)
+            detail = exc.detail
+        else:
+            code = STATUS_CODE_MAP.get(exc.status_code, "server_error")
+            detail = {"error": code, "detail": str(exc.detail)}
+
+        headers = exc.headers or {}
+        return JSONResponse(status_code=exc.status_code, content=detail, headers=headers)
+
+    # Generic 500 handler
+    @app.exception_handler(Exception)
+    async def generic_exception_handler(request: Request, exc: Exception) -> JSONResponse:
+        logger.exception("unhandled_exception", exc_info=exc)
+        return JSONResponse(
+            status_code=500,
+            content={"error": "server_error", "detail": "Internal server error"},
+        )
+
+    # Register API router
+    app.include_router(router)
+
+    # Static files
+    static_dir = Path(os.environ.get("LIFE_TOWERS_STATIC_DIR", "/app/static"))
+    if static_dir.exists() and static_dir.is_dir():
+        _mount_static(app, static_dir)
+    else:
+        logger.warning("static_dir_missing", path=str(static_dir))
+
+    return app
+
+
+def _mount_static(app: FastAPI, static_dir: Path) -> None:
+    """Mount static files with SPA fallback and proper cache headers."""
+
+    import re
+
+    # Matches Angular's content-hashed asset filenames, e.g.
+    #   main-L5B7PG5E.js, chunk-deadbeef.css, styles-6JWNHNC2.css, font.AbCdEf12.woff2
+    # The hash is at least 8 chars of alphanumerics, separated from the base name
+    # by either '-' (modern Angular) or '.' (older Angular / generic).
+    HASHED_PATTERN = re.compile(
+        r"[-.][A-Za-z0-9]{8,}\.(?:js|css|woff2?|png|jpe?g|svg|ico|map)$"
+    )
+
+    def _absolute_meta_urls(request: Request) -> tuple[str, str]:
+        configured_public_url = os.environ.get("LIFE_TOWERS_PUBLIC_URL", "").strip()
+        if configured_public_url:
+            public_root = configured_public_url.rstrip("/") + "/"
+            return public_root, f"{public_root}og-image.png"
+
+        parts = urlsplit(str(request.url))
+        canonical_url = urlunsplit((parts.scheme, parts.netloc, parts.path or "/", "", ""))
+
+        root_path = str(request.scope.get("root_path") or "").strip("/")
+        og_image_path = f"/{root_path}/og-image.png" if root_path else "/og-image.png"
+        og_image_url = urlunsplit((parts.scheme, parts.netloc, og_image_path, "", ""))
+        return canonical_url, og_image_url
+
+    def _serve_index(file_path: Path, request: Request) -> HTMLResponse:
+        canonical_url, og_image_url = _absolute_meta_urls(request)
+        html = file_path.read_text(encoding="utf-8")
+        html = html.replace(
+            'href="/" data-dynamic-url="canonical"',
+            f'href="{escape(canonical_url, quote=True)}" data-dynamic-url="canonical"',
+        )
+        html = html.replace(
+            'content="/" data-dynamic-url="canonical"',
+            f'content="{escape(canonical_url, quote=True)}" data-dynamic-url="canonical"',
+        )
+        html = html.replace(
+            'content="/og-image.png" data-dynamic-url="og-image"',
+            f'content="{escape(og_image_url, quote=True)}" data-dynamic-url="og-image"',
+        )
+
+        resp = HTMLResponse(html)
+        resp.headers["Cache-Control"] = "no-cache"
+        return resp
+
+    def _serve_file(file_path: Path, request: Request) -> Response:
+        if file_path.name == "index.html":
+            return _serve_index(file_path, request)
+
+        resp = FileResponse(str(file_path))
+        if HASHED_PATTERN.search(file_path.name):
+            resp.headers["Cache-Control"] = "public, max-age=31536000, immutable"
+        else:
+            resp.headers["Cache-Control"] = "no-cache"
+        return resp
+
+    @app.get("/{full_path:path}", include_in_schema=False)
+    async def spa_fallback(request: Request, full_path: str) -> Response:
+        # API routes are handled by the API router (registered before this);
+        # if execution reaches here for an /api/* path, it really is unknown.
+        if full_path.startswith("api/"):
+            raise HTTPException(status_code=404, detail="Not found")
+
+        # Real file? Serve it (with cache headers based on hash detection).
+        # Guard against path traversal by resolving and re-checking containment.
+        candidate = (static_dir / full_path).resolve()
+        try:
+            candidate.relative_to(static_dir.resolve())
+        except ValueError:
+            raise HTTPException(status_code=404, detail="Not found")
+        if candidate.is_file():
+            return _serve_file(candidate, request)
+
+        # SPA fallback to index.html.
+        index = static_dir / "index.html"
+        if index.is_file():
+            return _serve_file(index, request)
+
+        raise HTTPException(status_code=404, detail="Not found")
+
+
+app = create_app()

backend/src/life_towers/migrations/001_initial.sql

@@ -0,0 +1,54 @@
+-- Life Towers v4 initial schema.
+-- WAL mode, foreign keys, and busy_timeout are applied per-connection in
+-- db._apply_pragmas(), so they are not (and need not be) set here.
+-- All timestamps are unix epoch seconds (INTEGER).
+
+CREATE TABLE IF NOT EXISTS users (
+    id            TEXT PRIMARY KEY,
+    created_at    INTEGER NOT NULL,
+    last_seen_at  INTEGER NOT NULL
+) STRICT;
+
+CREATE TABLE IF NOT EXISTS pages (
+    id                          TEXT PRIMARY KEY,
+    user_id                     TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    position                    INTEGER NOT NULL,
+    name                        TEXT NOT NULL,
+    hide_create_tower_button    INTEGER NOT NULL DEFAULT 0 CHECK (hide_create_tower_button IN (0, 1)),
+    keep_tasks_open             INTEGER NOT NULL DEFAULT 0 CHECK (keep_tasks_open IN (0, 1)),
+    default_date_from           INTEGER,
+    default_date_to             INTEGER,
+    created_at                  INTEGER NOT NULL,
+    updated_at                  INTEGER NOT NULL
+) STRICT;
+CREATE INDEX IF NOT EXISTS idx_pages_user_position ON pages(user_id, position);
+
+CREATE TABLE IF NOT EXISTS towers (
+    id            TEXT PRIMARY KEY,
+    page_id       TEXT NOT NULL REFERENCES pages(id) ON DELETE CASCADE,
+    user_id       TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    position      INTEGER NOT NULL,
+    name          TEXT NOT NULL,
+    base_color_h  REAL NOT NULL CHECK (base_color_h BETWEEN 0 AND 1),
+    base_color_s  REAL NOT NULL CHECK (base_color_s BETWEEN 0 AND 1),
+    base_color_l  REAL NOT NULL CHECK (base_color_l BETWEEN 0 AND 1),
+    created_at    INTEGER NOT NULL,
+    updated_at    INTEGER NOT NULL
+) STRICT;
+CREATE INDEX IF NOT EXISTS idx_towers_page_position ON towers(page_id, position);
+CREATE INDEX IF NOT EXISTS idx_towers_user ON towers(user_id);
+
+CREATE TABLE IF NOT EXISTS blocks (
+    id            TEXT PRIMARY KEY,
+    tower_id      TEXT NOT NULL REFERENCES towers(id) ON DELETE CASCADE,
+    user_id       TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    position      INTEGER NOT NULL,
+    tag           TEXT NOT NULL DEFAULT '',
+    description   TEXT NOT NULL DEFAULT '',
+    is_done       INTEGER NOT NULL DEFAULT 0 CHECK (is_done IN (0, 1)),
+    difficulty    INTEGER NOT NULL DEFAULT 1 CHECK (difficulty >= 1),
+    created_at    INTEGER NOT NULL,
+    updated_at    INTEGER NOT NULL
+) STRICT;
+CREATE INDEX IF NOT EXISTS idx_blocks_tower_position ON blocks(tower_id, position);
+CREATE INDEX IF NOT EXISTS idx_blocks_user ON blocks(user_id);

backend/src/life_towers/models.py

@@ -0,0 +1,146 @@
+"""Pydantic v2 models matching the API spec exactly."""
+
+from __future__ import annotations
+
+from typing import Optional
+
+from pydantic import BaseModel, Field, field_validator, model_validator
+import uuid as _uuid_mod
+
+
+def _canonical_uuidv4(value: str) -> str:
+    try:
+        u = _uuid_mod.UUID(value)
+        if u.version == 4:
+            return str(u)
+    except (ValueError, AttributeError):
+        pass
+    raise ValueError("must be a UUIDv4")
+
+
+class HslColor(BaseModel):
+    h: float = Field(ge=0.0, le=1.0)
+    s: float = Field(ge=0.0, le=1.0)
+    l: float = Field(ge=0.0, le=1.0)
+
+
+class BlockIn(BaseModel):
+    id: str
+    tag: str = Field(max_length=200)
+    description: str = Field(max_length=10_000)
+    is_done: bool
+    difficulty: int = Field(default=1, ge=1, le=100)
+    created_at: Optional[int] = None
+
+    @field_validator("id")
+    @classmethod
+    def validate_id(cls, v: str) -> str:
+        return _canonical_uuidv4(v)
+
+
+class BlockOut(BaseModel):
+    id: str
+    tag: str
+    description: str
+    is_done: bool
+    difficulty: int
+    created_at: int
+
+
+class TowerIn(BaseModel):
+    id: str
+    name: str = Field(max_length=200)
+    base_color: HslColor
+    blocks: list[BlockIn] = Field(max_length=1000)
+
+    @field_validator("id")
+    @classmethod
+    def validate_id(cls, v: str) -> str:
+        return _canonical_uuidv4(v)
+
+
+class TowerOut(BaseModel):
+    id: str
+    name: str
+    base_color: HslColor
+    blocks: list[BlockOut]
+
+
+class PageIn(BaseModel):
+    id: str
+    name: str = Field(max_length=200)
+    hide_create_tower_button: bool = False
+    keep_tasks_open: bool = False
+    default_date_from: Optional[int] = None
+    default_date_to: Optional[int] = None
+    towers: list[TowerIn] = Field(max_length=100)
+
+    @field_validator("id")
+    @classmethod
+    def validate_id(cls, v: str) -> str:
+        return _canonical_uuidv4(v)
+
+
+class PageOut(BaseModel):
+    id: str
+    name: str
+    hide_create_tower_button: bool
+    keep_tasks_open: bool
+    default_date_from: Optional[int]
+    default_date_to: Optional[int]
+    towers: list[TowerOut]
+
+
+class DataIn(BaseModel):
+    pages: list[PageIn] = Field(max_length=100)
+
+    @model_validator(mode="after")
+    def check_unique_ids(self) -> "DataIn":
+        page_ids: set[str] = set()
+        tower_ids: set[str] = set()
+        block_ids: set[str] = set()
+        total_blocks = 0
+
+        for page in self.pages:
+            if page.id in page_ids:
+                raise ValueError(f"Duplicate page id: {page.id}")
+            page_ids.add(page.id)
+
+            for tower in page.towers:
+                if tower.id in tower_ids:
+                    raise ValueError(f"Duplicate tower id: {tower.id}")
+                tower_ids.add(tower.id)
+
+                for block in tower.blocks:
+                    if block.id in block_ids:
+                        raise ValueError(f"Duplicate block id: {block.id}")
+                    block_ids.add(block.id)
+                    total_blocks += 1
+
+        if total_blocks > 50_000:
+            raise ValueError(
+                f"Total blocks ({total_blocks}) exceeds maximum of 50,000"
+            )
+
+        return self
+
+
+class DataOut(BaseModel):
+    pages: list[PageOut]
+
+
+class RegisterRequest(BaseModel):
+    token: str
+
+    @field_validator("token")
+    @classmethod
+    def validate_token(cls, v: str) -> str:
+        return _canonical_uuidv4(v)
+
+
+class RegisterResponse(BaseModel):
+    user_id: str
+
+
+class HealthResponse(BaseModel):
+    status: str

backend/tests/__init__.py

@@ -0,0 +1 @@
+# Life Towers tests

backend/tests/test_api.py

@@ -0,0 +1,457 @@
+"""pytest + httpx AsyncClient tests for the Life Towers API."""
+
+from __future__ import annotations
+
+import uuid
+from pathlib import Path
+from typing import AsyncGenerator
+
+import pytest
+import pytest_asyncio
+from httpx import ASGITransport, AsyncClient
+
+import life_towers.db as db_module
+from life_towers.db import run_migrations, get_connection
+from life_towers.limits import limiter
+from life_towers.main import create_app
+
+
+def make_uuidv4() -> str:
+    return str(uuid.uuid4())
+
+
+@pytest.fixture()
+def anyio_backend():
+    return "asyncio"
+
+
+@pytest_asyncio.fixture()
+async def client(tmp_path: Path) -> AsyncGenerator[AsyncClient, None]:
+    """Create a test client backed by a fresh SQLite database."""
+    db_path = tmp_path / "test.db"
+    db_module._DB_PATH = db_path
+
+    # Reset rate limiter state so each test starts clean
+    limiter.reset()
+
+    # Run migrations using a fresh connection
+    conn = get_connection()
+    run_migrations(conn)
+    conn.close()
+
+    app = create_app()
+
+    async with AsyncClient(
+        transport=ASGITransport(app=app),
+        base_url="http://testserver",
+    ) as c:
+        yield c
+
+    # Reset DB path for next test
+    db_module._DB_PATH = None
+
+
+@pytest.mark.asyncio
+async def test_spa_index_injects_absolute_open_graph_urls(
+    tmp_path: Path, monkeypatch: pytest.MonkeyPatch
+) -> None:
+    static_dir = tmp_path / "static"
+    static_dir.mkdir()
+    (static_dir / "index.html").write_text(
+        """
+<!doctype html>
+<html>
+  <head>
+    <link rel="canonical" href="/" data-dynamic-url="canonical" />
+    <meta property="og:url" content="/" data-dynamic-url="canonical" />
+    <meta property="og:image" content="/og-image.png" data-dynamic-url="og-image" />
+    <meta name="twitter:image" content="/og-image.png" data-dynamic-url="og-image" />
+  </head>
+</html>
+""",
+        encoding="utf-8",
+    )
+    (static_dir / "og-image.png").write_bytes(b"fake png")
+    monkeypatch.setenv("LIFE_TOWERS_STATIC_DIR", str(static_dir))
+
+    app = create_app()
+    async with AsyncClient(
+        transport=ASGITransport(app=app),
+        base_url="https://towers.example",
+    ) as c:
+        resp = await c.get("/tasks?utm_source=test")
+
+    assert resp.status_code == 200
+    assert (
+        '<link rel="canonical" href="https://towers.example/tasks" '
+        'data-dynamic-url="canonical" />'
+    ) in resp.text
+    assert (
+        '<meta property="og:url" content="https://towers.example/tasks" '
+        'data-dynamic-url="canonical" />'
+    ) in resp.text
+    assert (
+        '<meta property="og:image" content="https://towers.example/og-image.png" '
+        'data-dynamic-url="og-image" />'
+    ) in resp.text
+    assert (
+        '<meta name="twitter:image" content="https://towers.example/og-image.png" '
+        'data-dynamic-url="og-image" />'
+    ) in resp.text
+
+    monkeypatch.setenv("LIFE_TOWERS_PUBLIC_URL", "https://public.example/towers")
+    app = create_app()
+    async with AsyncClient(
+        transport=ASGITransport(app=app),
+        base_url="https://internal.example",
+    ) as c:
+        resp = await c.get("/")
+
+    assert resp.status_code == 200
+    assert (
+        '<link rel="canonical" href="https://public.example/towers/" '
+        'data-dynamic-url="canonical" />'
+    ) in resp.text
+    assert (
+        '<meta property="og:image" content="https://public.example/towers/og-image.png" '
+        'data-dynamic-url="og-image" />'
+    ) in resp.text
+
+
+# ---------------------------------------------------------------------------
+# Register
+# ---------------------------------------------------------------------------
+
+@pytest.mark.asyncio
+async def test_register_new_token(client: AsyncClient) -> None:
+    token = make_uuidv4()
+    resp = await client.post("/api/v1/register", json={"token": token})
+    assert resp.status_code == 200
+    assert resp.json() == {"user_id": token}
+
+
+@pytest.mark.asyncio
+async def test_register_idempotent(client: AsyncClient) -> None:
+    token = make_uuidv4()
+    r1 = await client.post("/api/v1/register", json={"token": token})
+    r2 = await client.post("/api/v1/register", json={"token": token})
+    assert r1.status_code == 200
+    assert r2.status_code == 200
+    assert r1.json() == {"user_id": token}
+    assert r2.json() == {"user_id": token}
+
+
+@pytest.mark.asyncio
+async def test_register_non_uuid_token(client: AsyncClient) -> None:
+    resp = await client.post("/api/v1/register", json={"token": "not-a-uuid"})
+    assert resp.status_code == 400
+
+
+@pytest.mark.asyncio
+async def test_register_non_uuidv4_token(client: AsyncClient) -> None:
+    # UUIDv1
+    v1 = str(uuid.uuid1())
+    resp = await client.post("/api/v1/register", json={"token": v1})
+    assert resp.status_code == 400
+
+
+@pytest.mark.asyncio
+async def test_uuid_inputs_are_canonicalized(client: AsyncClient) -> None:
+    token = make_uuidv4()
+    upper_token = token.upper()
+    register_resp = await client.post("/api/v1/register", json={"token": upper_token})
+    assert register_resp.status_code == 200
+    assert register_resp.json() == {"user_id": token}
+
+    data_resp = await client.get(
+        "/api/v1/data",
+        headers={"Authorization": f"Bearer {upper_token}"},
+    )
+    assert data_resp.status_code == 200
+
+
+# ---------------------------------------------------------------------------
+# Auth / GET /data
+# ---------------------------------------------------------------------------
+
+@pytest.mark.asyncio
+async def test_get_data_no_token(client: AsyncClient) -> None:
+    resp = await client.get("/api/v1/data")
+    assert resp.status_code == 401
+
+
+@pytest.mark.asyncio
+async def test_get_data_bogus_token(client: AsyncClient) -> None:
+    resp = await client.get(
+        "/api/v1/data",
+        headers={"Authorization": f"Bearer {make_uuidv4()}"},
+    )
+    assert resp.status_code == 401
+
+
+@pytest.mark.asyncio
+async def test_get_data_empty_user(client: AsyncClient) -> None:
+    token = make_uuidv4()
+    await client.post("/api/v1/register", json={"token": token})
+    resp = await client.get(
+        "/api/v1/data",
+        headers={"Authorization": f"Bearer {token}"},
+    )
+    assert resp.status_code == 200
+    assert resp.json() == {"pages": []}
+
+
+# ---------------------------------------------------------------------------
+# Round-trip: register → PUT → GET
+# ---------------------------------------------------------------------------
+
+def _make_tree() -> dict:
+    """Build a valid tree with 2 pages × 2 towers × 3 blocks."""
+    pages = []
+    for pi in range(2):
+        towers = []
+        for ti in range(2):
+            blocks = []
+            for bi in range(3):
+                blocks.append(
+                    {
+                        "id": make_uuidv4(),
+                        "tag": f"tag-{pi}-{ti}-{bi}",
+                        "description": f"desc-{pi}-{ti}-{bi}",
+                        "is_done": False,
+                        "difficulty": bi + 1,
+                        "created_at": 1700000000 + bi,
+                    }
+                )
+            towers.append(
+                {
+                    "id": make_uuidv4(),
+                    "name": f"Tower {pi}-{ti}",
+                    "base_color": {"h": 0.1 * ti, "s": 0.5, "l": 0.6},
+                    "blocks": blocks,
+                }
+            )
+        pages.append(
+            {
+                "id": make_uuidv4(),
+                "name": f"Page {pi}",
+                "hide_create_tower_button": False,
+                "keep_tasks_open": False,
+                "default_date_from": None,
+                "default_date_to": None,
+                "towers": towers,
+            }
+        )
+    return {"pages": pages}
+
+
+@pytest.mark.asyncio
+async def test_round_trip(client: AsyncClient) -> None:
+    token = make_uuidv4()
+    await client.post("/api/v1/register", json={"token": token})
+    headers = {"Authorization": f"Bearer {token}"}
+
+    tree = _make_tree()
+    put_resp = await client.put("/api/v1/data", json=tree, headers=headers)
+    assert put_resp.status_code == 204
+
+    get_resp = await client.get("/api/v1/data", headers=headers)
+    assert get_resp.status_code == 200
+    data = get_resp.json()
+
+    assert len(data["pages"]) == 2
+    for pi, page in enumerate(data["pages"]):
+        assert page["id"] == tree["pages"][pi]["id"]
+        assert page["name"] == tree["pages"][pi]["name"]
+        assert len(page["towers"]) == 2
+        for ti, tower in enumerate(page["towers"]):
+            assert tower["id"] == tree["pages"][pi]["towers"][ti]["id"]
+            assert tower["name"] == tree["pages"][pi]["towers"][ti]["name"]
+            assert len(tower["blocks"]) == 3
+            for bi, block in enumerate(tower["blocks"]):
+                assert block["id"] == tree["pages"][pi]["towers"][ti]["blocks"][bi]["id"]
+                assert block["tag"] == tree["pages"][pi]["towers"][ti]["blocks"][bi]["tag"]
+                assert (
+                    block["difficulty"]
+                    == tree["pages"][pi]["towers"][ti]["blocks"][bi]["difficulty"]
+                )
+
+
+@pytest.mark.asyncio
+async def test_difficulty_defaults_to_one_when_omitted(client: AsyncClient) -> None:
+    """A block sent without `difficulty` is stored and returned as 1."""
+    token = make_uuidv4()
+    await client.post("/api/v1/register", json={"token": token})
+    headers = {"Authorization": f"Bearer {token}"}
+
+    tree = _make_tree()
+    # Drop difficulty from the very first block.
+    del tree["pages"][0]["towers"][0]["blocks"][0]["difficulty"]
+
+    put_resp = await client.put("/api/v1/data", json=tree, headers=headers)
+    assert put_resp.status_code == 204
+
+    data = (await client.get("/api/v1/data", headers=headers)).json()
+    assert data["pages"][0]["towers"][0]["blocks"][0]["difficulty"] == 1
+
+
+@pytest.mark.asyncio
+async def test_difficulty_must_be_positive(client: AsyncClient) -> None:
+    """difficulty < 1 is rejected by validation."""
+    token = make_uuidv4()
+    await client.post("/api/v1/register", json={"token": token})
+    headers = {"Authorization": f"Bearer {token}"}
+
+    tree = _make_tree()
+    tree["pages"][0]["towers"][0]["blocks"][0]["difficulty"] = 0
+
+    resp = await client.put("/api/v1/data", json=tree, headers=headers)
+    assert resp.status_code == 400
+
+
+# ---------------------------------------------------------------------------
+# Validation errors
+# ---------------------------------------------------------------------------
+
+@pytest.mark.asyncio
+async def test_put_duplicate_page_id(client: AsyncClient) -> None:
+    token = make_uuidv4()
+    await client.post("/api/v1/register", json={"token": token})
+    headers = {"Authorization": f"Bearer {token}"}
+
+    dup_id = make_uuidv4()
+    tree = _make_tree()
+    tree["pages"][0]["id"] = dup_id
+    tree["pages"][1]["id"] = dup_id  # duplicate
+
+    resp = await client.put("/api/v1/data", json=tree, headers=headers)
+    assert resp.status_code == 400  # pydantic validation error → 400 bad_request per spec
+    assert resp.json() == {"error": "bad_request", "detail": "Validation failed"}
+
+
+@pytest.mark.asyncio
+async def test_put_cross_user_id_conflict_returns_409(client: AsyncClient) -> None:
+    first_token = make_uuidv4()
+    second_token = make_uuidv4()
+    await client.post("/api/v1/register", json={"token": first_token})
+    await client.post("/api/v1/register", json={"token": second_token})
+
+    tree = _make_tree()
+    first_resp = await client.put(
+        "/api/v1/data",
+        json=tree,
+        headers={"Authorization": f"Bearer {first_token}"},
+    )
+    assert first_resp.status_code == 204
+
+    second_resp = await client.put(
+        "/api/v1/data",
+        json=tree,
+        headers={"Authorization": f"Bearer {second_token}"},
+    )
+    assert second_resp.status_code == 409
+    assert second_resp.json() == {
+        "error": "conflict",
+        "detail": "Submitted IDs conflict with existing data",
+    }
+
+
+@pytest.mark.asyncio
+async def test_put_name_too_long(client: AsyncClient) -> None:
+    token = make_uuidv4()
+    await client.post("/api/v1/register", json={"token": token})
+    headers = {"Authorization": f"Bearer {token}"}
+
+    tree = _make_tree()
+    tree["pages"][0]["name"] = "A" * 201  # exceeds 200 char limit
+
+    resp = await client.put("/api/v1/data", json=tree, headers=headers)
+    assert resp.status_code == 400  # pydantic validation error → 400 bad_request per spec
+
+
+@pytest.mark.asyncio
+async def test_put_body_too_large_via_content_length(client: AsyncClient) -> None:
+    """A body exceeding the 2 MiB cap, with Content-Length set, returns 413."""
+    from life_towers.limits import PAYLOAD_LIMIT_BYTES
+
+    token = make_uuidv4()
+    await client.post("/api/v1/register", json={"token": token})
+    over = PAYLOAD_LIMIT_BYTES + 1
+    headers = {
+        "Authorization": f"Bearer {token}",
+        "Content-Length": str(over),
+        "Content-Type": "application/json",
+    }
+    resp = await client.put("/api/v1/data", content=b"x" * over, headers=headers)
+    assert resp.status_code == 413
+    body = resp.json()
+    assert body == {
+        "error": "payload_too_large",
+        "detail": f"Request body exceeds {PAYLOAD_LIMIT_BYTES} bytes",
+    }
+
+
+@pytest.mark.asyncio
+async def test_unauthorized_detail_is_uniform(client: AsyncClient) -> None:
+    """All 401 responses must share an identical detail to prevent enumeration."""
+    bodies: list[dict] = []
+    # missing header
+    bodies.append((await client.get("/api/v1/data")).json())
+    # wrong scheme
+    bodies.append(
+        (
+            await client.get("/api/v1/data", headers={"Authorization": "Basic foo"})
+        ).json()
+    )
+    # malformed token
+    bodies.append(
+        (
+            await client.get(
+                "/api/v1/data", headers={"Authorization": "Bearer not-a-uuid"}
+            )
+        ).json()
+    )
+    # well-formed but unknown token
+    bodies.append(
+        (
+            await client.get(
+                "/api/v1/data", headers={"Authorization": f"Bearer {make_uuidv4()}"}
+            )
+        ).json()
+    )
+    assert len({tuple(sorted(b.items())) for b in bodies}) == 1, bodies
+
+
+@pytest.mark.asyncio
+async def test_put_replaces_prior_data(client: AsyncClient) -> None:
+    token = make_uuidv4()
+    await client.post("/api/v1/register", json={"token": token})
+    headers = {"Authorization": f"Bearer {token}"}
+
+    # First PUT: 2 pages
+    tree1 = _make_tree()
+    await client.put("/api/v1/data", json=tree1, headers=headers)
+
+    # Second PUT: 1 page
+    tree2 = {"pages": [tree1["pages"][0]]}
+    await client.put("/api/v1/data", json=tree2, headers=headers)
+
+    get_resp = await client.get("/api/v1/data", headers=headers)
+    data = get_resp.json()
+    assert len(data["pages"]) == 1
+    assert data["pages"][0]["id"] == tree1["pages"][0]["id"]
+
+
+# ---------------------------------------------------------------------------
+# Rate limit (mock / direct hit)
+# ---------------------------------------------------------------------------
+
+@pytest.mark.asyncio
+async def test_register_rate_limit(client: AsyncClient) -> None:
+    """Hit /register past the per-IP limit; the next call returns 429."""
+    # Limit is 30/hour/IP. Make 31 requests; the 31st must be 429.
+    responses = []
+    for _ in range(31):
+        resp = await client.post("/api/v1/register", json={"token": make_uuidv4()})
+        responses.append(resp.status_code)
+    assert responses[-1] == 429, f"Expected 429 on 31st request, got: {responses[-3:]}"

backend/uv.lock

@@ -0,0 +1,831 @@
+version = 1
+revision = 3
+requires-python = ">=3.11"
+
+[[package]]
+name = "annotated-doc"
+version = "0.0.4"
+source = { registry = "https://pypi.org/simple" }
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+wheels = [
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+]
+
+[[package]]
+name = "annotated-types"
+version = "0.7.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/ee/67/531ea369ba64dcff5ec9c3402f9f51bf748cec26dde048a2f973a4eea7f5/annotated_types-0.7.0.tar.gz", hash = "sha256:aff07c09a53a08bc8cfccb9c85b05f1aa9a2a6f23728d790723543408344ce89", size = 16081, upload-time = "2024-05-20T21:33:25.928Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/78/b6/6307fbef88d9b5ee7421e68d78a9f162e0da4900bc5f5793f6d3d0e34fb8/annotated_types-0.7.0-py3-none-any.whl", hash = "sha256:1f02e8b43a8fbbc3f3e0d4f0f4bfc8131bcb4eebe8849b8e5c773f3a1c582a53", size = 13643, upload-time = "2024-05-20T21:33:24.1Z" },
+]
+
+[[package]]
+name = "anyio"
+version = "4.13.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "idna" },
+    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
+]
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+]

docker-compose.dev.yml

@@ -0,0 +1,25 @@
+# Dev / e2e compose. Uses an ephemeral anonymous volume so each `up` starts
+# with a clean SQLite database — ideal for Playwright runs that expect a
+# fresh state.
+#
+# Usage:
+#   docker compose -f docker-compose.dev.yml up --build -d
+#   # ... run tests against http://localhost:8000 ...
+#   docker compose -f docker-compose.dev.yml down -v
+
+services:
+  life-towers:
+    build: .
+    image: life-towers:dev
+    ports:
+      - "8000:8000"
+    volumes:
+      - /data
+    environment:
+      LIFE_TOWERS_ALLOWED_ORIGIN: ""
+    healthcheck:
+      test: ["CMD", "curl", "-fsS", "http://localhost:8000/api/v1/health"]
+      interval: 2s
+      timeout: 3s
+      retries: 15
+      start_period: 5s

docker-compose.yml

@@ -0,0 +1,28 @@
+services:
+  life-towers:
+    # Default to a registry image so `docker compose pull && up -d` deploys
+    # a new build. Override LIFE_TOWERS_IMAGE in your `.env` to pin a tag,
+    # or set it to e.g. `life-towers:local` and uncomment `build: .` for
+    # local builds.
+    image: ${LIFE_TOWERS_IMAGE:-life-towers:local}
+    # build: .  # uncomment for local builds (or use docker-compose.dev.yml)
+    pull_policy: ${LIFE_TOWERS_PULL_POLICY:-missing}
+    ports:
+      - "${LIFE_TOWERS_PORT:-8000}:8000"
+    volumes:
+      # Named volume inherits ownership from the image (UID 1000 / appuser).
+      # To switch to a bind mount for easy host-side backups, replace with:
+      #   - ./data:/data
+      # and first run: `mkdir -p data && sudo chown 1000:1000 data`.
+      - life-towers-data:/data
+    environment:
+      LIFE_TOWERS_ALLOWED_ORIGIN: "${LIFE_TOWERS_ALLOWED_ORIGIN:-}"
+    restart: unless-stopped
+    logging:
+      driver: json-file
+      options:
+        max-size: "10m"
+        max-file: "3"
+
+volumes:
+  life-towers-data:

frontend/.browserslistrc

@@ -0,0 +1,7 @@
+last 2 Chrome versions
+last 2 Firefox versions
+last 2 Safari versions
+last 2 Edge versions
+Firefox ESR
+not dead
+not IE 11

frontend/.editorconfig

@@ -8,6 +8,10 @@ indent_size = 2
 insert_final_newline = true
 trim_trailing_whitespace = true
 
+[*.ts]
+quote_type = single
+ij_typescript_use_double_quotes = false
+
 [*.md]
 max_line_length = off
 trim_trailing_whitespace = false

frontend/.gitignore

@@ -0,0 +1,50 @@
+# See https://docs.github.com/get-started/getting-started-with-git/ignoring-files for more about ignoring files.
+
+# Compiled output
+/dist
+/tmp
+/out-tsc
+/bazel-out
+
+# Playwright
+/test-results
+/playwright-report
+/playwright/.cache
+/visuals
+
+# Node
+/node_modules
+npm-debug.log
+yarn-error.log
+
+# IDEs and editors
+.idea/
+.project
+.classpath
+.c9/
+*.launch
+.settings/
+*.sublime-workspace
+
+# Visual Studio Code
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+!.vscode/mcp.json
+.history/*
+
+# Miscellaneous
+/.angular/cache
+.sass-cache/
+/connect.lock
+/coverage
+/libpeerconnection.log
+testem.log
+/typings
+__screenshots__/
+
+# System files
+.DS_Store
+Thumbs.db

frontend/.prettierrc

@@ -0,0 +1,12 @@
+{
+  "printWidth": 100,
+  "singleQuote": true,
+  "overrides": [
+    {
+      "files": "*.html",
+      "options": {
+        "parser": "angular"
+      }
+    }
+  ]
+}

frontend/.vscode/extensions.json

@@ -0,0 +1,4 @@
+{
+  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=827846
+  "recommendations": ["angular.ng-template"]
+}

frontend/.vscode/launch.json

@@ -0,0 +1,20 @@
+{
+  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "ng serve",
+      "type": "chrome",
+      "request": "launch",
+      "preLaunchTask": "npm: start",
+      "url": "http://localhost:4200/"
+    },
+    {
+      "name": "ng test",
+      "type": "chrome",
+      "request": "launch",
+      "preLaunchTask": "npm: test",
+      "url": "http://localhost:9876/debug.html"
+    }
+  ]
+}

frontend/.vscode/mcp.json

@@ -0,0 +1,9 @@
+{
+  // For more information, visit: https://angular.dev/ai/mcp
+  "servers": {
+    "angular-cli": {
+      "command": "npx",
+      "args": ["-y", "@angular/cli", "mcp"]
+    }
+  }
+}

frontend/.vscode/tasks.json

@@ -0,0 +1,42 @@
+{
+  // For more information, visit: https://go.microsoft.com/fwlink/?LinkId=733558
+  "version": "2.0.0",
+  "tasks": [
+    {
+      "type": "npm",
+      "script": "start",
+      "isBackground": true,
+      "problemMatcher": {
+        "owner": "typescript",
+        "pattern": "$tsc",
+        "background": {
+          "activeOnStart": true,
+          "beginsPattern": {
+            "regexp": "Changes detected"
+          },
+          "endsPattern": {
+            "regexp": "bundle generation (complete|failed)"
+          }
+        }
+      }
+    },
+    {
+      "type": "npm",
+      "script": "test",
+      "isBackground": true,
+      "problemMatcher": {
+        "owner": "typescript",
+        "pattern": "$tsc",
+        "background": {
+          "activeOnStart": true,
+          "beginsPattern": {
+            "regexp": "Changes detected"
+          },
+          "endsPattern": {
+            "regexp": "bundle generation (complete|failed)"
+          }
+        }
+      }
+    }
+  ]
+}

frontend/README.md

@@ -0,0 +1,11 @@
+# Life Towers Frontend
+
+Angular frontend for the Life Towers app. See the root `README.md` for the full
+stack setup.
+
+```bash
+npm start          # dev server on :4200, with /api proxied to :8000
+npm test           # Vitest unit tests
+npm run test:e2e   # Playwright against PLAYWRIGHT_BASE_URL or localhost:8000
+npm run build      # production bundle
+```

frontend/angular.json

@@ -0,0 +1,91 @@
+{
+  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
+  "version": 1,
+  "cli": {
+    "packageManager": "npm",
+    "schematicCollections": [
+      "angular-eslint"
+    ],
+    "analytics": false
+  },
+  "projects": {
+    "frontend": {
+      "projectType": "application",
+      "schematics": {
+        "@schematics/angular:component": {
+          "style": "scss"
+        }
+      },
+      "root": "",
+      "sourceRoot": "src",
+      "prefix": "app",
+      "architect": {
+        "build": {
+          "builder": "@angular/build:application",
+          "options": {
+            "browser": "src/main.ts",
+            "tsConfig": "tsconfig.app.json",
+            "inlineStyleLanguage": "scss",
+            "assets": [
+              {
+                "glob": "**/*",
+                "input": "public"
+              }
+            ],
+            "styles": [
+              "src/styles.scss"
+            ]
+          },
+          "configurations": {
+            "production": {
+              "budgets": [
+                {
+                  "type": "initial",
+                  "maximumWarning": "500kB",
+                  "maximumError": "1MB"
+                },
+                {
+                  "type": "anyComponentStyle",
+                  "maximumWarning": "16kB",
+                  "maximumError": "32kB"
+                }
+              ],
+              "outputHashing": "all",
+              "serviceWorker": "ngsw-config.json"
+            },
+            "development": {
+              "optimization": false,
+              "extractLicenses": false,
+              "sourceMap": true
+            }
+          },
+          "defaultConfiguration": "production"
+        },
+        "serve": {
+          "builder": "@angular/build:dev-server",
+          "configurations": {
+            "production": {
+              "buildTarget": "frontend:build:production"
+            },
+            "development": {
+              "buildTarget": "frontend:build:development"
+            }
+          },
+          "defaultConfiguration": "development",
+          "options": {
+            "proxyConfig": "proxy.conf.json"
+          }
+        },
+        "lint": {
+          "builder": "@angular-eslint/builder:lint",
+          "options": {
+            "lintFilePatterns": [
+              "src/**/*.ts",
+              "src/**/*.html"
+            ]
+          }
+        }
+      }
+    }
+  }
+}

frontend/e2e/smoke.spec.ts

@@ -0,0 +1,183 @@
+import { test, expect, type Page } from '@playwright/test';
+
+async function expectTaskListOpen(page: Page, description: string): Promise<void> {
+  const tasks = page.locator('lt-tasks', { hasText: description }).first();
+  const taskBody = tasks.locator('.all-task');
+  const taskRow = tasks.locator('.task-container', { hasText: description }).first();
+
+  await expect(tasks.locator('.header')).toHaveCount(0);
+  await expect
+    .poll(async () =>
+      taskBody.evaluate((el) => {
+        const height = el.getBoundingClientRect().height;
+        return height / Math.max(1, el.scrollHeight);
+      }),
+    )
+    .toBeGreaterThan(0.9);
+  await taskRow.locator('.tickbox').click({ trial: true });
+}
+
+/**
+ * Smoke test: drives the legacy-styled UI end-to-end.
+ *
+ *   docker compose -f docker-compose.dev.yml up --build -d
+ *   PLAYWRIGHT_BASE_URL=http://life-towers:8000 npx playwright test
+ *   docker compose -f docker-compose.dev.yml down -v
+ */
+test.describe('Life Towers smoke test', () => {
+  test('create page → tower → block, mark done, reload, persists', async ({ page }) => {
+    await page.goto('/');
+
+    // Wait for init, then dismiss the welcome modal so the page controls are reachable.
+    await expect(page.getByText('Welcome to Life Towers')).toBeVisible({ timeout: 15000 });
+    await page.getByRole('button', { name: 'Start empty' }).click();
+    await page.waitForSelector('section.modal', { state: 'detached' });
+    await expect(page.getByText('Add a new page to get started!')).toBeVisible();
+
+    // Create a page via the select-add dropdown.
+    await page.locator('lt-select-add .top').first().click();
+    await page.locator('lt-select-add input[placeholder="Add a value…"]').fill('Hobbies');
+    await page.locator('lt-select-add input[placeholder="Add a value…"]').press('Enter');
+
+    // The page name now appears in the dropdown top.
+    await expect(page.locator('lt-select-add .top').first()).toContainText('Hobbies');
+
+    // Create a tower.
+    await page.locator('img[alt="Add tower"]').click();
+    await page.locator('input[placeholder="New tower"]').fill('Side projects');
+    await page.locator('lt-tower-settings button[type="submit"]').click();
+
+    // Tower's name input is rendered with the tower name as its value.
+    await expect(page.locator('lt-tower input').first()).toHaveValue('Side projects');
+
+    // Create a block.
+    await page.locator('img[alt="Add block"]').first().click();
+    // The tag input is inside an lt-select-add — open it and add a tag.
+    await page.locator('lt-block-edit lt-select-add .top').click();
+    await page
+      .locator('lt-block-edit lt-select-add input[placeholder="Add a value…"]')
+      .fill('learn');
+    await page
+      .locator('lt-block-edit lt-select-add input[placeholder="Add a value…"]')
+      .press('Enter');
+    await page.locator('textarea[placeholder="Write a description here…"]').fill(
+      'Modernise the towers app',
+    );
+    await page.getByLabel('Already done').uncheck();
+    await page.getByRole('button', { name: 'Create and exit', exact: true }).click();
+
+    // New block is pending → appears in the tasks accordion.
+    // (Tasks header shows N tasks.)
+    await expect(page.locator('lt-tasks')).toContainText('1');
+
+    // Open the tasks accordion + click the task to edit it, then flip done.
+    await page.locator('lt-tasks .header').click();
+    await page.locator('lt-tasks .task-description').click();
+
+    // Toggle done in the block-edit modal.
+    const putLanded = page.waitForResponse(
+      (r) => r.url().endsWith('/api/v1/data') && r.request().method() === 'PUT' && r.ok(),
+    );
+    await page.locator('lt-block-edit .card.active').getByLabel('Already done').check();
+    await putLanded;
+    await page.locator('lt-block-edit .card.active .exit').click();
+    await page.waitForSelector('section.modal', { state: 'detached' });
+
+    // Done block now appears as a colored square in the tower's falling stack.
+    await expect(page.locator('lt-tower lt-block').first()).toBeVisible();
+
+    // Reload — everything must come back from the server.
+    await page.reload();
+    await expect(page.locator('lt-select-add .top').first()).toContainText('Hobbies', {
+      timeout: 15000,
+    });
+    await expect(page.locator('lt-tower input').first()).toHaveValue('Side projects');
+    await expect(page.locator('lt-tower lt-block').first()).toBeVisible();
+  });
+
+  test('keep tasks open shows new pending tasks and survives immediate reload', async ({ page }) => {
+    await page.goto('/');
+
+    await expect(page.getByText('Welcome to Life Towers')).toBeVisible({ timeout: 15000 });
+    await page.getByRole('button', { name: 'Start empty' }).click();
+    await page.waitForSelector('section.modal', { state: 'detached' });
+
+    await page.locator('lt-select-add .top').first().click();
+    await page.locator('lt-select-add input[placeholder="Add a value…"]').fill('Work');
+    await page.locator('lt-select-add input[placeholder="Add a value…"]').press('Enter');
+
+    await page.locator('img[alt="Add tower"]').click();
+    await page.locator('input[placeholder="New tower"]').fill('Today');
+    await page.locator('lt-tower-settings button[type="submit"]').click();
+    await page.waitForSelector('section.modal', { state: 'detached' });
+
+    await page.getByRole('button', { name: 'Settings' }).click();
+    await page.getByText('Keep tasks open').click();
+    await page.locator('lt-settings .exit').click();
+    await page.waitForSelector('section.modal', { state: 'detached' });
+
+    await page.locator('img[alt="Add block"]').first().click();
+    const createCard = page.locator('lt-block-edit .create-card');
+    await expect(createCard.getByLabel('Already done')).not.toBeChecked();
+    await createCard.locator('lt-select-add .top').click();
+    await createCard.locator('lt-select-add input[placeholder="Add a value…"]').fill('ops');
+    await createCard.locator('lt-select-add input[placeholder="Add a value…"]').press('Enter');
+    await createCard
+      .locator('textarea[placeholder="Write a description here…"]')
+      .fill('Review deploy notes');
+    await page.getByRole('button', { name: 'Create and exit', exact: true }).click();
+    await page.waitForSelector('section.modal', { state: 'detached' });
+
+    await expectTaskListOpen(page, 'Review deploy notes');
+
+    await page.reload();
+
+    await expect(page.locator('lt-select-add .top').first()).toContainText('Work', {
+      timeout: 15000,
+    });
+    await expectTaskListOpen(page, 'Review deploy notes');
+
+    await page.locator('img[alt="Add block"]').first().click();
+    await expect(page.locator('lt-block-edit .create-card').getByLabel('Already done')).not.toBeChecked();
+  });
+
+  test('keep tasks open expands existing pending tasks after reload', async ({ page }) => {
+    await page.goto('/');
+
+    await expect(page.getByText('Welcome to Life Towers')).toBeVisible({ timeout: 15000 });
+    await page.getByRole('button', { name: 'Start empty' }).click();
+    await page.waitForSelector('section.modal', { state: 'detached' });
+
+    await page.locator('lt-select-add .top').first().click();
+    await page.locator('lt-select-add input[placeholder="Add a value…"]').fill('Ops');
+    await page.locator('lt-select-add input[placeholder="Add a value…"]').press('Enter');
+
+    await page.locator('img[alt="Add tower"]').click();
+    await page.locator('input[placeholder="New tower"]').fill('Queue');
+    await page.locator('lt-tower-settings button[type="submit"]').click();
+    await page.waitForSelector('section.modal', { state: 'detached' });
+
+    await page.locator('img[alt="Add block"]').first().click();
+    await page.locator('lt-block-edit lt-select-add .top').click();
+    await page.locator('lt-block-edit lt-select-add input[placeholder="Add a value…"]').fill('triage');
+    await page.locator('lt-block-edit lt-select-add input[placeholder="Add a value…"]').press('Enter');
+    await page
+      .locator('textarea[placeholder="Write a description here…"]')
+      .fill('Clean up alerts');
+    await page.getByLabel('Already done').uncheck();
+    await page.getByRole('button', { name: 'Create and exit', exact: true }).click();
+    await page.waitForSelector('section.modal', { state: 'detached' });
+
+    await page.getByRole('button', { name: 'Settings' }).click();
+    await page.getByText('Keep tasks open').click();
+    await page.locator('lt-settings .exit').click();
+    await page.waitForSelector('section.modal', { state: 'detached' });
+
+    await page.reload();
+
+    await expect(page.locator('lt-select-add .top').first()).toContainText('Ops', {
+      timeout: 15000,
+    });
+    await expectTaskListOpen(page, 'Clean up alerts');
+  });
+});

frontend/e2e/visuals.spec.ts

@@ -0,0 +1,213 @@
+import { test } from '@playwright/test';
+
+test.skip(
+  process.env['CAPTURE_VISUALS'] !== '1',
+  'Set CAPTURE_VISUALS=1 to run the visual screenshot capture suite.',
+);
+
+/**
+ * Visual capture: drives the UI into key states and writes screenshots
+ * for human review of the legacy-styled design.
+ */
+test.describe('Life Towers visuals', () => {
+  test('capture key UI states', async ({ page }) => {
+    await page.goto('/');
+    await page.waitForSelector('text=Welcome to Life Towers', { timeout: 15000 });
+    await page.waitForTimeout(350); // let the welcome modal finish fade-in
+    await page.screenshot({ path: 'visuals/01-welcome-modal.png', fullPage: true });
+
+    // Dismiss the welcome modal with Start empty, then continue.
+    await page.getByRole('button', { name: 'Start empty' }).click();
+    await page.waitForSelector('section.modal', { state: 'detached' });
+
+    await page.screenshot({ path: 'visuals/01b-empty-state-after-dismiss.png', fullPage: true });
+
+    // Open the page dropdown (without creating a page yet).
+    await page.locator('lt-select-add .top').first().click();
+    // Wait for the slide-down animation to finish (200ms transform + buffer).
+    await page.waitForTimeout(300);
+    await page.screenshot({ path: 'visuals/02-page-dropdown-open.png', fullPage: true });
+
+    // Create the page.
+    await page.locator('lt-select-add input[placeholder="Add a value…"]').fill('Hobbies');
+    await page.locator('lt-select-add input[placeholder="Add a value…"]').press('Enter');
+    await page.locator('body').click({ position: { x: 10, y: 400 } });
+    await page.waitForTimeout(200);
+
+    // ── Add a tower ─────────────────────────────────────────────────────────
+    await page.locator('img[alt="Add tower"]').click();
+    await page.waitForSelector('section.modal.active');
+    await page.waitForTimeout(350);
+    await page.locator('input[placeholder="New tower"]').fill('Reading');
+    await page.screenshot({ path: 'visuals/03-new-tower-modal.png', fullPage: true });
+    await page.locator('lt-tower-settings button[type="submit"]').click();
+    await page.waitForSelector('section.modal', { state: 'detached' });
+
+    // ── Open the block-edit carousel (empty) ────────────────────────────────
+    await page.locator('img[alt="Add block"]').first().click();
+    await page.waitForSelector('section.modal.active');
+    await page.waitForTimeout(350);
+    await page.screenshot({ path: 'visuals/04-block-edit-carousel-empty.png', fullPage: true });
+
+    // Fill in the create card. Make this one a NOT-finished task so the
+    // tasks accordion has a row to show off (with the tickbox).
+    const createCard = page.locator('lt-block-edit .create-card');
+    await createCard.locator('lt-select-add .top').click();
+    await createCard.locator('lt-select-add input[placeholder="Add a value…"]').fill('novel');
+    await createCard.locator('lt-select-add input[placeholder="Add a value…"]').press('Enter');
+    await createCard
+      .locator('textarea[placeholder="Write a description here…"]')
+      .fill('Finish The Brothers Karamazov');
+    // Uncheck "Already done" so this becomes a pending task.
+    await createCard.getByLabel('Already done').uncheck();
+    await page.getByRole('button', { name: 'Create and exit', exact: true }).click();
+    await page.waitForSelector('section.modal', { state: 'detached' });
+
+    // Open the tasks accordion to show the new tickbox.
+    await page.waitForTimeout(200);
+    await page.locator('lt-tasks .header').click();
+    await page.waitForTimeout(300);
+    await page.screenshot({ path: 'visuals/04b-tasks-accordion-with-tickbox.png', fullPage: true });
+
+    // Hover the tickbox: must NOT pop a scrollbar in the accordion, must NOT
+    // paint the global button-underline bar across the top, and the ✓ must stay
+    // centred (regression guard — see tasks.component .tickbox::after).
+    await page.locator('lt-tasks .tickbox').first().hover();
+    await page.waitForTimeout(350);
+    await page.locator('lt-tasks .container').screenshot({
+      path: 'visuals/04c-tasks-tickbox-hover.png',
+    });
+
+    // Add a couple more blocks.
+    for (const desc of ['Read about WebAssembly GC', 'Re-read "Out of the Tar Pit"']) {
+      await page.locator('img[alt="Add block"]').first().click();
+      await page.waitForSelector('section.modal.active');
+      await page.waitForTimeout(350);
+      const cc = page.locator('lt-block-edit .create-card');
+      // Re-use existing tag "novel" — click it from the select-add list.
+      await cc.locator('lt-select-add .top').click();
+      await page.waitForTimeout(100);
+      await cc.locator('textarea[placeholder="Write a description here…"]').fill(desc);
+      await page.getByRole('button', { name: 'Create and exit', exact: true }).click();
+      await page.waitForSelector('section.modal', { state: 'detached' });
+    }
+
+    // Wait for the falling animation to finish.
+    await page.waitForTimeout(1800);
+    await page.screenshot({ path: 'visuals/05-populated-falling-blocks.png', fullPage: true });
+
+    // ── Open carousel WITH existing blocks ──────────────────────────────────
+    await page.locator('img[alt="Add block"]').first().click();
+    await page.waitForSelector('section.modal.active');
+    await page.waitForTimeout(350);
+    await page.screenshot({ path: 'visuals/06-carousel-with-existing.png', fullPage: true });
+
+    // Scroll one card to the left (to focus an existing block, showing neighbour mask).
+    await page.locator('lt-block-edit').evaluate((el) => {
+      const c = el.querySelector('.carousel') as HTMLElement | null;
+      if (c) c.scrollBy({ left: -400, behavior: 'instant' as ScrollBehavior });
+    });
+    await page.waitForTimeout(400);
+    await page.screenshot({ path: 'visuals/07-carousel-existing-focused.png', fullPage: true });
+
+    // Close the carousel via the exit X.
+    await page.locator('lt-block-edit .exit').first().click({ force: true });
+    await page.waitForSelector('section.modal', { state: 'detached' });
+
+    // ── Add a second tower so we can show drag-drop ─────────────────────────
+    await page.locator('img[alt="Add tower"]').click();
+    await page.waitForSelector('section.modal.active');
+    await page.waitForTimeout(350);
+    await page.locator('input[placeholder="New tower"]').fill('Side projects');
+    await page.locator('lt-tower-settings button[type="submit"]').click();
+    await page.waitForSelector('section.modal', { state: 'detached' });
+    await page.waitForTimeout(300);
+
+    // ── Drag a tower over the trash (capture mid-drag) ──────────────────────
+    const firstTowerHandle = page.locator('lt-tower').first();
+    const trash = page.locator('img.trash');
+    const tb = await firstTowerHandle.boundingBox();
+    if (tb) {
+      // Pick up the tower from its center, then move toward the trash.
+      await page.mouse.move(tb.x + tb.width / 2, tb.y + tb.height / 2);
+      await page.mouse.down();
+      // Move in two stages — first to dislodge cdkDrag, then over the trash.
+      await page.mouse.move(tb.x + tb.width / 2 + 30, tb.y + tb.height / 2 + 30, { steps: 8 });
+      const trb = await trash.boundingBox();
+      if (trb) {
+        await page.mouse.move(trb.x + trb.width / 2, trb.y + trb.height / 2, { steps: 12 });
+        await page.waitForTimeout(300);
+        await page.screenshot({ path: 'visuals/08-dragging-over-trash.png', fullPage: true });
+      }
+      // Actually release over the trash to trigger the confirm-delete modal.
+      await page.mouse.up();
+      await page.waitForTimeout(400);
+      await page.screenshot({ path: 'visuals/08b-confirm-delete-modal.png', fullPage: true });
+      // Cancel — don't actually delete the tower.
+      await page.locator('.confirm-buttons button').filter({ hasText: 'Cancel' }).click();
+      await page.waitForSelector('section.modal', { state: 'detached' });
+    }
+
+    // ── Move the date-range slider thumb — blocks should ascend out ────────
+    const slider = page.locator('lt-double-slider input[type="range"]').first();
+    const sb = await slider.boundingBox();
+    if (sb) {
+      // Drag the left thumb from 0 toward the right (~80% of slider width).
+      await page.mouse.move(sb.x + 4, sb.y + sb.height / 2);
+      await page.mouse.down();
+      await page.mouse.move(sb.x + sb.width * 0.8, sb.y + sb.height / 2, { steps: 16 });
+      await page.mouse.up();
+      // Wait long enough for the 1.5s ascend transition.
+      await page.waitForTimeout(1700);
+      await page.screenshot({ path: 'visuals/09-date-filter-ascended.png', fullPage: true });
+      // Restore the range and screenshot the descend back to rest.
+      await page.mouse.move(sb.x + sb.width * 0.8, sb.y + sb.height / 2);
+      await page.mouse.down();
+      await page.mouse.move(sb.x + 4, sb.y + sb.height / 2, { steps: 16 });
+      await page.mouse.up();
+      await page.waitForTimeout(1700);
+      await page.screenshot({ path: 'visuals/10-date-filter-restored.png', fullPage: true });
+    }
+
+    // ── Settings modal ──────────────────────────────────────────────────────
+    await page.getByRole('button', { name: 'Settings' }).click();
+    await page.waitForSelector('section.modal.active');
+    await page.waitForTimeout(350);
+    await page.screenshot({ path: 'visuals/11-settings-modal.png', fullPage: true });
+  });
+
+  test('"Load sample towers" populates a sample page', async ({ page }) => {
+    await page.goto('/');
+    await page.waitForSelector('text=Welcome to Life Towers', { timeout: 15000 });
+    await page.waitForTimeout(350);
+    await page.getByRole('button', { name: 'Load sample towers' }).click();
+    await page.waitForSelector('section.modal', { state: 'detached' });
+    await page.waitForTimeout(1800);
+    await page.screenshot({ path: 'visuals/12-example-data.png', fullPage: true });
+  });
+
+  test('Mobile viewport — welcome + example + carousel', async ({ browser }) => {
+    const ctx = await browser.newContext({ viewport: { width: 390, height: 844 } });
+    const page = await ctx.newPage();
+
+    await page.goto((process.env['PLAYWRIGHT_BASE_URL'] ?? 'http://localhost:8000') + '/');
+    await page.waitForSelector('text=Welcome to Life Towers', { timeout: 15000 });
+    await page.waitForTimeout(350);
+    await page.screenshot({ path: 'visuals/13-mobile-welcome.png', fullPage: true });
+
+    await page.getByRole('button', { name: 'Load sample towers' }).click();
+    await page.waitForSelector('section.modal', { state: 'detached' });
+    await page.waitForTimeout(1800);
+    await page.screenshot({ path: 'visuals/14-mobile-populated.png', fullPage: true });
+
+    // Open the block-edit carousel for the first tower's first task.
+    await page.locator('lt-tasks .header').first().click();
+    await page.waitForTimeout(400);
+    await page.locator('lt-tasks .task-description').first().click();
+    await page.waitForSelector('section.modal.active');
+    await page.waitForTimeout(400);
+    await page.screenshot({ path: 'visuals/15-mobile-carousel.png', fullPage: true });
+
+    await ctx.close();
+  });
+});

frontend/eslint.config.js

@@ -0,0 +1,55 @@
+// @ts-check
+const eslint = require('@eslint/js');
+const { defineConfig } = require('eslint/config');
+const tseslint = require('typescript-eslint');
+const angular = require('angular-eslint');
+
+module.exports = defineConfig([
+  {
+    files: ['**/*.ts'],
+    extends: [
+      eslint.configs.recommended,
+      tseslint.configs.recommended,
+      tseslint.configs.stylistic,
+      angular.configs.tsRecommended,
+    ],
+    processor: angular.processInlineTemplates,
+    rules: {
+      '@angular-eslint/directive-selector': [
+        'error',
+        {
+          type: 'attribute',
+          prefix: ['lt', 'app'],
+          style: 'camelCase',
+        },
+      ],
+      '@angular-eslint/component-selector': [
+        'error',
+        {
+          type: 'element',
+          prefix: ['lt', 'app'],
+          style: 'kebab-case',
+        },
+      ],
+      // Allow output named 'close' - it is not a standard DOM event on custom elements
+      '@angular-eslint/no-output-native': 'off',
+      // Allow empty arrow functions in catch clauses for fire-and-forget patterns
+      '@typescript-eslint/no-empty-function': 'off',
+    },
+  },
+  {
+    files: ['**/*.html'],
+    extends: [angular.configs.templateRecommended, angular.configs.templateAccessibility],
+    rules: {
+      // Relax label association check – our modal inputs are associated via id/for
+      '@angular-eslint/template/label-has-associated-control': 'warn',
+    },
+  },
+  {
+    // Vitest test files – relax unused-vars for test utilities
+    files: ['**/*.vitest.ts'],
+    rules: {
+      '@typescript-eslint/no-unused-vars': ['warn', { argsIgnorePattern: '^_' }],
+    },
+  },
+]);

frontend/ngsw-config.json

@@ -0,0 +1,28 @@
+{
+  "$schema": "./node_modules/@angular/service-worker/config/schema.json",
+  "index": "/index.html",
+  "assetGroups": [
+    {
+      "name": "app",
+      "installMode": "prefetch",
+      "resources": {
+        "files": [
+          "/favicon.ico",
+          "/index.csr.html",
+          "/index.html",
+          "/manifest.webmanifest",
+          "/*.css",
+          "/*.js"
+        ]
+      }
+    },
+    {
+      "name": "assets",
+      "installMode": "lazy",
+      "updateMode": "prefetch",
+      "resources": {
+        "files": ["/**/*.(svg|cur|jpg|jpeg|png|apng|webp|avif|gif|otf|ttf|woff|woff2)"]
+      }
+    }
+  ]
+}

frontend/package.json

@@ -0,0 +1,43 @@
+{
+  "name": "frontend",
+  "version": "0.0.0",
+  "scripts": {
+    "ng": "ng",
+    "start": "ng serve",
+    "build": "ng build",
+    "watch": "ng build --watch --configuration development",
+    "test": "vitest --run",
+    "test:watch": "vitest",
+    "test:e2e": "playwright test",
+    "lint": "ng lint"
+  },
+  "private": true,
+  "packageManager": "npm@10.9.2",
+  "dependencies": {
+    "@angular/cdk": "^21.2.13",
+    "@plausible-analytics/tracker": "^0.4.5",
+    "@angular/common": "^21.2.0",
+    "@angular/compiler": "^21.2.0",
+    "@angular/core": "^21.2.0",
+    "@angular/forms": "^21.2.0",
+    "@angular/platform-browser": "^21.2.0",
+    "@angular/service-worker": "^21.2.0",
+    "rxjs": "~7.8.0",
+    "tslib": "^2.3.0"
+  },
+  "devDependencies": {
+    "@angular/build": "^21.2.13",
+    "@angular/cli": "^21.2.13",
+    "@angular/compiler-cli": "^21.2.0",
+    "@eslint/js": "^10.0.1",
+    "@playwright/test": "^1.60.0",
+    "@vitest/coverage-v8": "^4.1.7",
+    "angular-eslint": "21.4.0",
+    "eslint": "^10.3.0",
+    "jsdom": "^28.1.0",
+    "prettier": "^3.8.1",
+    "typescript": "~5.9.2",
+    "typescript-eslint": "8.59.2",
+    "vitest": "^4.1.7"
+  }
+}

frontend/playwright.config.ts

@@ -0,0 +1,30 @@
+import { defineConfig, devices } from '@playwright/test';
+
+/**
+ * E2E tests target the full stack served by docker-compose.dev.yml at
+ * http://localhost:8000 (FastAPI serving both the API and the built SPA).
+ * Override with PLAYWRIGHT_BASE_URL to point at a different deployment.
+ *
+ *   docker compose -f docker-compose.dev.yml up --build -d
+ *   npm run test:e2e
+ *   docker compose -f docker-compose.dev.yml down -v
+ */
+export default defineConfig({
+  testDir: './e2e',
+  fullyParallel: true,
+  forbidOnly: !!process.env['CI'],
+  retries: process.env['CI'] ? 2 : 0,
+  workers: process.env['CI'] ? 1 : undefined,
+  reporter: [['list'], ['html', { open: 'never' }]],
+  use: {
+    baseURL: process.env['PLAYWRIGHT_BASE_URL'] ?? 'http://localhost:8000',
+    trace: 'on-first-retry',
+    screenshot: 'only-on-failure',
+  },
+  projects: [
+    {
+      name: 'chromium',
+      use: { ...devices['Desktop Chrome'] },
+    },
+  ],
+});

frontend/proxy.conf.json

@@ -0,0 +1,7 @@
+{
+  "/api": {
+    "target": "http://localhost:8000",
+    "secure": false,
+    "changeOrigin": false
+  }
+}

frontend/public/assets/pen.svg

@@ -0,0 +1,4 @@
+<?xml version="1.0"?>
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" id="Capa_1" x="0px" y="0px" width="512px" height="512px" viewBox="0 0 528.899 528.899" style="enable-background:new 0 0 528.899 528.899;" xml:space="preserve"><g><g>
+	<path d="M328.883,89.125l107.59,107.589l-272.34,272.34L56.604,361.465L328.883,89.125z M518.113,63.177l-47.981-47.981   c-18.543-18.543-48.653-18.543-67.259,0l-45.961,45.961l107.59,107.59l53.611-53.611   C532.495,100.753,532.495,77.559,518.113,63.177z M0.3,512.69c-1.958,8.812,5.998,16.708,14.811,14.565l119.891-29.069   L27.473,390.597L0.3,512.69z" data-original="#000000" class="active-path" data-old_color="#000000" fill="#5D576B"/>
+</g></g> </svg>

frontend/public/favicon.svg

@@ -0,0 +1,13 @@
+<svg width="512" height="512" viewBox="0 0 512 512" xmlns="http://www.w3.org/2000/svg"><defs>
+  <linearGradient id="bg" x1="0" y1="0" x2="512" y2="512" gradientUnits="userSpaceOnUse"><stop offset="0" stop-color="#fffcf0"/><stop offset="1" stop-color="#ffebeb"/></linearGradient>
+  <linearGradient id="b1" x1="0" y1="0" x2="0" y2="1"><stop offset="0" stop-color="#9a6069"/><stop offset="1" stop-color="#7f4f59"/></linearGradient>
+  <linearGradient id="b2" x1="0" y1="0" x2="0" y2="1"><stop offset="0" stop-color="#b07480"/><stop offset="1" stop-color="#9a6069"/></linearGradient>
+  <linearGradient id="b3" x1="0" y1="0" x2="0" y2="1"><stop offset="0" stop-color="#c98579"/><stop offset="1" stop-color="#b87672"/></linearGradient>
+  <linearGradient id="b4" x1="0" y1="0" x2="0" y2="1"><stop offset="0" stop-color="#e2987f"/><stop offset="1" stop-color="#d4836f"/></linearGradient>
+  <filter id="sh" x="-30%" y="-30%" width="160%" height="190%"><feDropShadow dx="0" dy="6" stdDeviation="7" flood-color="#5d576b" flood-opacity="0.18"/></filter>
+</defs><rect width="512" height="512" rx="112" fill="url(#bg)"/><g filter="url(#sh)">
+  <rect x="134" y="360" width="244" height="64" rx="18" fill="url(#b1)"/>
+  <rect x="148" y="286" width="216" height="64" rx="18" fill="url(#b2)"/>
+  <rect x="162" y="212" width="188" height="64" rx="18" fill="url(#b3)"/>
+  <g transform="rotate(-7 256 158)"><rect x="176" y="126" width="160" height="64" rx="18" fill="url(#b4)"/></g>
+</g></svg>

frontend/public/logo-mark.svg

@@ -0,0 +1,13 @@
+<svg width="512" height="512" viewBox="0 0 512 512" xmlns="http://www.w3.org/2000/svg"><defs>
+  <linearGradient id="bg" x1="0" y1="0" x2="512" y2="512" gradientUnits="userSpaceOnUse"><stop offset="0" stop-color="#fffcf0"/><stop offset="1" stop-color="#ffebeb"/></linearGradient>
+  <linearGradient id="b1" x1="0" y1="0" x2="0" y2="1"><stop offset="0" stop-color="#9a6069"/><stop offset="1" stop-color="#7f4f59"/></linearGradient>
+  <linearGradient id="b2" x1="0" y1="0" x2="0" y2="1"><stop offset="0" stop-color="#b07480"/><stop offset="1" stop-color="#9a6069"/></linearGradient>
+  <linearGradient id="b3" x1="0" y1="0" x2="0" y2="1"><stop offset="0" stop-color="#c98579"/><stop offset="1" stop-color="#b87672"/></linearGradient>
+  <linearGradient id="b4" x1="0" y1="0" x2="0" y2="1"><stop offset="0" stop-color="#e2987f"/><stop offset="1" stop-color="#d4836f"/></linearGradient>
+  <filter id="sh" x="-30%" y="-30%" width="160%" height="190%"><feDropShadow dx="0" dy="6" stdDeviation="7" flood-color="#5d576b" flood-opacity="0.18"/></filter>
+</defs><rect width="512" height="512" rx="112" fill="url(#bg)"/><g filter="url(#sh)">
+  <rect x="134" y="360" width="244" height="64" rx="18" fill="url(#b1)"/>
+  <rect x="148" y="286" width="216" height="64" rx="18" fill="url(#b2)"/>
+  <rect x="162" y="212" width="188" height="64" rx="18" fill="url(#b3)"/>
+  <g transform="rotate(-7 256 158)"><rect x="176" y="126" width="160" height="64" rx="18" fill="url(#b4)"/></g>
+</g></svg>

frontend/public/logo-mono.svg

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+<svg width="1118" height="200" viewBox="0 0 1118 200" xmlns="http://www.w3.org/2000/svg"><defs>
+  <linearGradient id="bg" x1="0" y1="0" x2="512" y2="512" gradientUnits="userSpaceOnUse"><stop offset="0" stop-color="#fffcf0"/><stop offset="1" stop-color="#ffebeb"/></linearGradient>
+  <linearGradient id="b1" x1="0" y1="0" x2="0" y2="1"><stop offset="0" stop-color="#9a6069"/><stop offset="1" stop-color="#7f4f59"/></linearGradient>
+  <linearGradient id="b2" x1="0" y1="0" x2="0" y2="1"><stop offset="0" stop-color="#b07480"/><stop offset="1" stop-color="#9a6069"/></linearGradient>
+  <linearGradient id="b3" x1="0" y1="0" x2="0" y2="1"><stop offset="0" stop-color="#c98579"/><stop offset="1" stop-color="#b87672"/></linearGradient>
+  <linearGradient id="b4" x1="0" y1="0" x2="0" y2="1"><stop offset="0" stop-color="#e2987f"/><stop offset="1" stop-color="#d4836f"/></linearGradient>
+  <filter id="sh" x="-30%" y="-30%" width="160%" height="190%"><feDropShadow dx="0" dy="6" stdDeviation="7" flood-color="#5d576b" flood-opacity="0.18"/></filter>
+</defs><g transform="scale(0.39063)"><rect width="512" height="512" rx="112" fill="url(#bg)"/><g filter="url(#sh)">
+  <rect x="134" y="360" width="244" height="64" rx="18" fill="url(#b1)"/>
+  <rect x="148" y="286" width="216" height="64" rx="18" fill="url(#b2)"/>
+  <rect x="162" y="212" width="188" height="64" rx="18" fill="url(#b3)"/>
+  <g transform="rotate(-7 256 158)"><rect x="176" y="126" width="160" height="64" rx="18" fill="url(#b4)"/></g>
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frontend/public/logo.svg

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+  <linearGradient id="bg" x1="0" y1="0" x2="512" y2="512" gradientUnits="userSpaceOnUse"><stop offset="0" stop-color="#fffcf0"/><stop offset="1" stop-color="#ffebeb"/></linearGradient>
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frontend/public/manifest.webmanifest

@@ -0,0 +1,59 @@
+{
+  "name": "Life Towers",
+  "short_name": "Towers",
+  "display": "standalone",
+  "scope": "./",
+  "start_url": "./",
+  "theme_color": "#a2666f",
+  "background_color": "#fffcf0",
+  "icons": [
+    {
+      "src": "icons/icon-72x72.png",
+      "sizes": "72x72",
+      "type": "image/png",
+      "purpose": "maskable any"
+    },
+    {
+      "src": "icons/icon-96x96.png",
+      "sizes": "96x96",
+      "type": "image/png",
+      "purpose": "maskable any"
+    },
+    {
+      "src": "icons/icon-128x128.png",
+      "sizes": "128x128",
+      "type": "image/png",
+      "purpose": "maskable any"
+    },
+    {
+      "src": "icons/icon-144x144.png",
+      "sizes": "144x144",
+      "type": "image/png",
+      "purpose": "maskable any"
+    },
+    {
+      "src": "icons/icon-152x152.png",
+      "sizes": "152x152",
+      "type": "image/png",
+      "purpose": "maskable any"
+    },
+    {
+      "src": "icons/icon-192x192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "maskable any"
+    },
+    {
+      "src": "icons/icon-384x384.png",
+      "sizes": "384x384",
+      "type": "image/png",
+      "purpose": "maskable any"
+    },
+    {
+      "src": "icons/icon-512x512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "maskable any"
+    }
+  ]
+}

frontend/src/app/app.config.ts

@@ -0,0 +1,20 @@
+import {
+  ApplicationConfig,
+  provideBrowserGlobalErrorListeners,
+  isDevMode,
+  provideZonelessChangeDetection,
+} from '@angular/core';
+import { provideHttpClient, withFetch } from '@angular/common/http';
+import { provideServiceWorker } from '@angular/service-worker';
+
+export const appConfig: ApplicationConfig = {
+  providers: [
+    provideBrowserGlobalErrorListeners(),
+    provideZonelessChangeDetection(),
+    provideHttpClient(withFetch()),
+    provideServiceWorker('ngsw-worker.js', {
+      enabled: !isDevMode(),
+      registrationStrategy: 'registerWhenStable:30000',
+    }),
+  ],
+};

frontend/src/app/app.ts

@@ -0,0 +1,21 @@
+import { Component, ChangeDetectionStrategy, OnInit, inject } from '@angular/core';
+import { StoreService } from './services/store.service';
+import { AnalyticsService } from './services/analytics.service';
+import { PagesComponent } from './components/pages/pages.component';
+
+@Component({
+  selector: 'app-root',
+  standalone: true,
+  imports: [PagesComponent],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `<lt-pages />`,
+})
+export class App implements OnInit {
+  private readonly store = inject(StoreService);
+  private readonly analytics = inject(AnalyticsService);
+
+  ngOnInit(): void {
+    this.analytics.init();
+    void this.store.init();
+  }
+}

frontend/src/app/components/block/block.component.ts

@@ -0,0 +1,62 @@
+import { Component, ChangeDetectionStrategy, input, output, computed } from '@angular/core';
+import { Block, HslColor } from '../../models';
+import { getColorOfTag } from '../../utils/color';
+
+/**
+ * A block rendered as a small COLORED SQUARE (1/6 of tower width).
+ * Only DONE blocks appear here; pending blocks appear in the tasks accordion.
+ * Clicking opens the block-edit modal in the parent tower component.
+ */
+@Component({
+  selector: 'lt-block',
+  standalone: true,
+  imports: [],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    <div
+      role="button"
+      tabindex="0"
+      aria-label="Edit completed task"
+      [class.hovered]="hovered()"
+      [style.background-color]="color()"
+      (click)="clicked.emit()"
+      (keydown.enter)="clicked.emit()"
+      (keydown.space)="$event.preventDefault(); clicked.emit()"
+    ></div>
+  `,
+  styles: `
+    @import '../../../library/main';
+
+    :host {
+      position: relative;
+      width: calc(100% / 6);
+      padding-bottom: calc(100% / 6);
+
+      div {
+        position: absolute;
+        width: 100%;
+        height: 100%;
+        cursor: pointer;
+
+        @media (hover: hover) and (pointer: fine) {
+          transition: transform $long-animation-time;
+
+          &:hover,
+          &.hovered {
+            transform: translateY(4px);
+          }
+        }
+      }
+    }
+  `,
+})
+export class BlockComponent {
+  readonly block = input.required<Block>();
+  readonly baseColor = input.required<HslColor>();
+  readonly hovered = input(false);
+
+  /** Emits when the square is clicked — parent opens the block-edit modal. */
+  readonly clicked = output<void>();
+
+  readonly color = computed(() => getColorOfTag(this.block().tag, this.baseColor()));
+}

frontend/src/app/components/modal/block-edit.component.ts

@@ -0,0 +1,842 @@
+import {
+  Component,
+  ChangeDetectionStrategy,
+  input,
+  output,
+  signal,
+  effect,
+  viewChild,
+  ElementRef,
+  AfterViewInit,
+  HostListener,
+  untracked,
+} from '@angular/core';
+import { Block, HslColor } from '../../models';
+import { SelectAddComponent } from '../shared/select-add/select-add.component';
+import { getColorOfTag } from '../../utils/color';
+
+export interface BlockEditSave {
+  /** null = create a new block */
+  id: string | null;
+  tag: string;
+  description: string;
+  is_done: boolean;
+  difficulty: number;
+}
+
+interface EditedValue {
+  tag: string;
+  description: string;
+  is_done: boolean;
+  difficulty: number;
+}
+
+function clampDifficulty(value: number): number {
+  return Math.max(1, Math.min(100, value));
+}
+
+export function createDoneValue(defaultDone: boolean, currentDone: boolean, edited: boolean): boolean {
+  return edited ? currentDone : defaultDone;
+}
+
+@Component({
+  selector: 'lt-block-edit',
+  standalone: true,
+  imports: [SelectAddComponent],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    @if (viewTitle()) {
+      <h2 class="view-title">{{ viewTitle() }}</h2>
+    }
+
+    <section
+      #container
+      class="carousel"
+      (scroll)="onScroll()"
+      (click)="onBackdropClick($event)"
+      (keydown.enter)="onBackdropClick($any($event))"
+      tabindex="-1"
+    >
+      <div class="card placeholder"></div>
+
+      @for (b of blocks(); track b.id; let i = $index) {
+        <div
+          class="card"
+          [class.active]="activeIdx() === i + 1"
+          [class.near-active]="activeIdx() === i || activeIdx() === i + 2"
+          role="button"
+          tabindex="0"
+          [attr.aria-label]="'Focus ' + (editedFor(b.id).tag || 'block')"
+          (click)="onCardClick(i + 1)"
+          (keydown.enter)="onCardClick(i + 1)"
+          (keydown.space)="$event.preventDefault(); onCardClick(i + 1)"
+        >
+          <div class="mask"></div>
+
+          <div class="header">
+            <button
+              class="exit"
+              type="button"
+              aria-label="Close"
+              (click)="close.emit(); $event.stopPropagation()"
+            ></button>
+            <div
+              class="block-dot"
+              [style.background-color]="colorOfTagForBlock(b.id)"
+            ></div>
+            <h1>{{ formatDate(b.created_at, true) }}</h1>
+          </div>
+
+          <div class="select-add-container">
+            <lt-select-add
+              [items]="tags()"
+              [selected]="editedFor(b.id).tag"
+              [alwaysDropShadow]="true"
+              [onlyShadowBorder]="true"
+              [placeholder]="tagPlaceholder('Tag this item…')"
+              (select)="updateTag(b.id, $event)"
+              (add)="updateTag(b.id, $event)"
+            />
+          </div>
+
+          <textarea
+            placeholder="Write a description here…"
+            maxlength="10000"
+            [value]="editedFor(b.id).description"
+            (input)="updateDescription(b.id, $any($event.target).value)"
+            (blur)="flushExisting(b.id)"
+          ></textarea>
+
+          <label class="done-checkbox">
+            <input
+              type="checkbox"
+              [checked]="editedFor(b.id).is_done"
+              (change)="updateDone(b.id, $any($event.target).checked)"
+            />
+            <span>Already done</span>
+          </label>
+
+          <div class="difficulty">
+            <span class="label">Difficulty</span>
+            <div class="stepper">
+              <button
+                type="button"
+                class="step"
+                aria-label="Decrease difficulty"
+                [disabled]="editedFor(b.id).difficulty <= 1"
+                (click)="updateDifficulty(b.id, -1); $event.stopPropagation()"
+              >−</button>
+              <span class="value">{{ editedFor(b.id).difficulty }}</span>
+              <button
+                type="button"
+                class="step"
+                aria-label="Increase difficulty"
+                [disabled]="editedFor(b.id).difficulty >= 100"
+                (click)="updateDifficulty(b.id, 1); $event.stopPropagation()"
+              >+</button>
+            </div>
+          </div>
+
+          <div class="bottom">
+            <button (click)="onDelete(b.id); $event.stopPropagation()">Delete</button>
+          </div>
+        </div>
+      }
+
+      <div
+        class="card create-card"
+        [class.active]="activeIdx() === blocks().length + 1"
+        [class.near-active]="activeIdx() === blocks().length"
+        role="button"
+        tabindex="0"
+        aria-label="Focus create card"
+        (click)="onCardClick(blocks().length + 1)"
+        (keydown.enter)="onCardClick(blocks().length + 1)"
+        (keydown.space)="$event.preventDefault(); onCardClick(blocks().length + 1)"
+      >
+        <div class="mask"></div>
+
+        <div class="header">
+          <button
+            class="exit"
+            type="button"
+            aria-label="Close"
+            (click)="close.emit(); $event.stopPropagation()"
+          ></button>
+          <div
+            class="block-dot"
+            [style.background-color]="colorOfNewTag()"
+          ></div>
+          <h1>Create now</h1>
+        </div>
+
+        <div class="select-add-container" [class.required-empty]="!newValue().tag">
+          <lt-select-add
+            [items]="tags()"
+            [selected]="newValue().tag"
+            [alwaysDropShadow]="true"
+            [onlyShadowBorder]="true"
+            [placeholder]="tagPlaceholder('Set a category…')"
+            (select)="updateNewTag($event)"
+            (add)="updateNewTag($event)"
+          />
+        </div>
+
+        <textarea
+          placeholder="Write a description here…"
+          maxlength="10000"
+          [value]="newValue().description"
+          (input)="updateNewDescription($any($event.target).value)"
+        ></textarea>
+
+        <label class="done-checkbox">
+          <input
+            type="checkbox"
+            [checked]="newValue().is_done"
+            (change)="updateNewDone($any($event.target).checked)"
+          />
+          <span>Already done</span>
+        </label>
+
+        <div class="difficulty">
+          <span class="label">Difficulty</span>
+          <div class="stepper">
+            <button
+              type="button"
+              class="step"
+              aria-label="Decrease difficulty"
+              [disabled]="newValue().difficulty <= 1"
+              (click)="updateNewDifficulty(-1); $event.stopPropagation()"
+            >−</button>
+            <span class="value">{{ newValue().difficulty }}</span>
+            <button
+              type="button"
+              class="step"
+              aria-label="Increase difficulty"
+              [disabled]="newValue().difficulty >= 100"
+              (click)="updateNewDifficulty(1); $event.stopPropagation()"
+            >+</button>
+          </div>
+        </div>
+
+        <div class="bottom">
+          <button
+            (click)="submitNew(); $event.stopPropagation()"
+            [disabled]="!newValue().tag"
+          >
+            Create and exit
+          </button>
+        </div>
+      </div>
+
+      <div class="card placeholder"></div>
+    </section>
+  `,
+  styles: `
+    @import '../../../library/main';
+
+    :host {
+      @include center-child();
+      position: fixed;
+      top: 0;
+      left: 0;
+      right: 0;
+      bottom: 0;
+      z-index: 10001; // above modal backdrop (10000)
+
+      @media (max-height: $min-height) {
+        align-items: flex-start;
+        overflow-y: auto;
+      }
+    }
+
+    .view-title {
+      position: fixed;
+      top: var(--large-padding);
+      left: var(--large-padding);
+      right: var(--large-padding);
+      z-index: 10002;
+      margin: 0;
+      text-align: center;
+      white-space: nowrap;
+      overflow: hidden;
+      text-overflow: ellipsis;
+      pointer-events: none;
+    }
+
+    .carousel {
+      --title-clearance: calc((var(--large-padding) * 2) + var(--larger-font-size));
+      width: 100%;
+      height: 100%;
+      display: flex;
+      align-items: center;
+      box-sizing: border-box;
+      padding: var(--title-clearance) 0 var(--large-padding);
+      overflow-x: auto;
+      overflow-y: hidden;
+      scroll-behavior: smooth;
+      scroll-snap-type: x mandatory;
+
+      @media (max-width: $mobile-width) {
+        padding: var(--title-clearance) var(--medium-padding) var(--medium-padding);
+      }
+
+      @media (max-height: $min-height) {
+        min-height: max-content;
+        align-items: flex-start;
+        padding-top: var(--title-clearance);
+        padding-bottom: var(--medium-padding);
+        overflow-y: visible;
+      }
+
+      &::-webkit-scrollbar {
+        width: 0;
+        height: 0;
+      }
+    }
+
+    .card {
+      @include card();
+      box-shadow: $shadow;
+      display: block;
+      transform-origin: center center;
+      flex: 0 0 auto;
+      width: 66vw;
+      max-width: 400px;
+      scroll-snap-align: center;
+      @media (max-width: $mobile-width) {
+        width: min(88vw, 360px);
+        max-width: calc(100vw - (2 * var(--medium-padding)));
+        padding: var(--medium-padding);
+        margin: 0 calc(var(--small-padding) / 2);
+        opacity: 1 !important;
+      }
+      box-sizing: border-box;
+      padding: var(--large-padding);
+      margin: calc(var(--large-padding) / 2);
+      position: relative;
+      @include inner-spacing(var(--large-padding));
+
+      opacity: 0.6;
+      transition: opacity $long-animation-time;
+
+      &.near-active {
+        cursor: pointer;
+        opacity: 0.85;
+      }
+
+      &.active {
+        opacity: 1;
+      }
+
+      .mask {
+        position: absolute;
+        left: 0;
+        top: 0;
+        width: 100%;
+        height: 100%;
+        z-index: 10000;
+        @include card();
+        opacity: 1;
+        transition: opacity $long-animation-time;
+        pointer-events: none;
+        @media (max-width: $mobile-width) {
+          opacity: 0 !important;
+        }
+      }
+
+      &.active .mask {
+        opacity: 0;
+      }
+
+      &.near-active .mask {
+        opacity: 0.55;
+      }
+
+      &:first-child {
+        margin-left: var(--large-padding);
+      }
+
+      &.placeholder {
+        opacity: 0 !important;
+        width: 60vw;
+        max-width: 60vw;
+        @media (max-width: $mobile-width) {
+          width: var(--medium-padding);
+          max-width: var(--medium-padding);
+          min-width: var(--medium-padding);
+        }
+        box-shadow: none;
+        background: transparent;
+      }
+
+      .header {
+        @include center-child();
+        position: relative;
+        gap: var(--small-padding);
+
+        h1 {
+          min-width: 0;
+          overflow-wrap: anywhere;
+        }
+
+        .exit {
+          position: absolute;
+          right: 0;
+          @include exit();
+        }
+
+        .block-dot {
+          @include square(12px);
+          margin-right: 10px;
+          border-radius: 2px;
+        }
+      }
+
+      .select-add-container {
+        // When the create card has no tag chosen, glow the dropdown red as a
+        // gentle "required" cue — matches the legacy ghost-button affordance.
+        &.required-empty lt-select-add {
+          box-shadow: 0 0 0 0.75px rgba(181, 63, 63, 0.5);
+          border-radius: var(--border-radius);
+        }
+      }
+
+      .done-checkbox {
+        @include medium-text();
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        gap: var(--small-padding);
+        width: max-content;
+        max-width: 100%;
+        margin: 0 auto var(--medium-padding);
+        cursor: pointer;
+
+        input[type='checkbox'] {
+          -webkit-appearance: none;
+          appearance: none;
+          @include square(22px);
+          flex: 0 0 auto;
+          position: relative;
+          box-sizing: border-box;
+          margin: 0;
+          border: 0;
+          border-radius: 4px;
+          background: $light-color;
+          box-shadow: $shadow-border;
+          cursor: pointer;
+          transition: background-color $short-animation-time, box-shadow $long-animation-time, transform $short-animation-time;
+
+          &::after {
+            content: '';
+            position: absolute;
+            left: 7px;
+            top: 3px;
+            width: 6px;
+            height: 12px;
+            border: solid $light-color;
+            border-width: 0 2px 2px 0;
+            opacity: 0;
+            transform: rotate(45deg) scale(0.8);
+            transition: opacity $short-animation-time, transform $short-animation-time;
+          }
+
+          &:checked {
+            background: $text-color;
+
+            &::after {
+              opacity: 1;
+              transform: rotate(45deg) scale(1);
+            }
+          }
+
+          &:hover,
+          &:focus-visible {
+            box-shadow: $shadow;
+          }
+
+          &:active {
+            transform: scale(0.95);
+          }
+        }
+
+        span {
+          line-height: 1.3;
+        }
+      }
+
+      .difficulty {
+        @include medium-text();
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        gap: var(--small-padding);
+        width: max-content;
+        max-width: 100%;
+        margin: 0 auto var(--medium-padding);
+
+        .stepper {
+          display: flex;
+          align-items: center;
+          gap: var(--small-padding);
+
+          .value {
+            min-width: 1.5em;
+            text-align: center;
+            font-variant-numeric: tabular-nums;
+          }
+
+          button.step {
+            all: unset;                       // strip native + global button styles
+            @include square(22px);
+            @include center-child();
+            flex: 0 0 auto;
+            box-sizing: border-box;
+            border-radius: 4px;
+            background: $light-color;
+            box-shadow: $shadow-border;
+            cursor: pointer;
+            // all:unset drops the font to serif and the global button's hover
+            // underline (button::after) survives the reset — re-assert both.
+            font: bold 18px/1 $normal-font;
+            color: $text-color;
+            user-select: none;
+            transition: box-shadow $long-animation-time, transform $short-animation-time, opacity $short-animation-time;
+
+            &::after { content: none; }
+
+            @media (max-width: $mobile-width) {
+              @include square(26px);
+            }
+
+            &:hover,
+            &:focus-visible {
+              box-shadow: $shadow;
+            }
+
+            &:active {
+              transform: scale(0.95);
+            }
+
+            &:disabled {
+              opacity: 0.4;
+              cursor: not-allowed;
+              box-shadow: $shadow-border;
+            }
+          }
+        }
+      }
+
+      .bottom {
+        height: 32px;
+        @media (max-width: $mobile-width) {
+          height: 24px;
+        }
+        position: relative;
+
+        button {
+          margin: 0;
+          position: absolute;
+          left: 50%;
+          top: 50%;
+          transform: translateY(-50%) translateX(-50%);
+        }
+      }
+
+      @media (max-width: $mobile-width) {
+        lt-select-add,
+        .done-checkbox {
+          max-width: 100%;
+          width: 100%;
+        }
+
+        .bottom {
+          min-height: 42px;
+
+          button {
+            width: max-content;
+            max-width: 100%;
+            min-height: 42px;
+          }
+        }
+      }
+    }
+  `,
+})
+export class BlockEditComponent implements AfterViewInit {
+  readonly viewTitle = input<string>('');
+  readonly blocks = input.required<Block[]>();
+  readonly activeBlockId = input<string | null>(null);
+  readonly tags = input<string[]>([]);
+  readonly baseColor = input.required<HslColor>();
+  /** Default for `is_done` on the create card. */
+  readonly defaultDone = input<boolean>(true);
+
+  readonly save = output<BlockEditSave>();
+  readonly delete = output<string>();
+  readonly close = output<void>();
+
+  private readonly container =
+    viewChild<ElementRef<HTMLElement>>('container');
+
+  // Per-block edited values, keyed by block ID.
+  readonly editedValues = signal<Map<string, EditedValue>>(new Map());
+
+  // Pending new block being authored on the create card.
+  readonly newValue = signal<EditedValue>({
+    tag: '',
+    description: '',
+    is_done: true,
+    difficulty: 1,
+  });
+  private newDoneEdited = false;
+
+  // 1-based index of the centered card. 0/N+2 are placeholders.
+  readonly activeIdx = signal(1);
+
+  private scrollToken = 0;
+
+  constructor() {
+    // Seed editedValues from input blocks (and re-seed if input changes).
+    effect(() => {
+      const bs = this.blocks();
+      const m = new Map<string, EditedValue>();
+      for (const b of bs) {
+        m.set(b.id, {
+          tag: b.tag,
+          description: b.description,
+          is_done: b.is_done,
+          difficulty: b.difficulty ?? 1,
+        });
+      }
+      untracked(() => this.editedValues.set(m));
+    });
+
+    // Seed the newValue tag from tags input on first run.
+    effect(() => {
+      const t = this.tags();
+      untracked(() => {
+        const cur = this.newValue();
+        if (!cur.tag) {
+          this.newValue.set({
+            ...cur,
+            tag: t.length > 0 ? t[0] : '',
+          });
+        }
+      });
+    });
+
+    effect(() => {
+      const isDone = this.defaultDone();
+      untracked(() => {
+        this.newValue.update((v) => ({
+          ...v,
+          is_done: createDoneValue(isDone, v.is_done, this.newDoneEdited),
+        }));
+      });
+    });
+  }
+
+  ngAfterViewInit(): void {
+    // Position scroll on the focused card (or the create card if none).
+    queueMicrotask(() => {
+      const blocks = this.blocks();
+      const focusId = this.activeBlockId();
+      const focusIdx = focusId
+        ? Math.max(0, blocks.findIndex((b) => b.id === focusId))
+        : blocks.length;
+      this.scrollToChild(focusIdx + 1, false);
+    });
+  }
+
+  // ── Helpers ────────────────────────────────────────────────────────────────
+
+  editedFor(id: string): EditedValue {
+    return (
+      this.editedValues().get(id) ?? {
+        tag: '',
+        description: '',
+        is_done: false,
+        difficulty: 1,
+      }
+    );
+  }
+
+  private colorOfTag(tag: string): string {
+    return tag ? getColorOfTag(tag, this.baseColor()) : 'transparent';
+  }
+
+  colorOfTagForBlock(id: string): string {
+    return this.colorOfTag(this.editedFor(id).tag);
+  }
+
+  tagPlaceholder(fallback: string): string {
+    return this.tags().length === 0 ? 'No tags yet. Open to create one.' : fallback;
+  }
+
+  colorOfNewTag(): string {
+    return this.colorOfTag(this.newValue().tag);
+  }
+
+  formatDate(ts: number, compact = false): string {
+    const d = new Date(ts * 1000);
+    if (compact) {
+      return d.toLocaleString(undefined, {
+        month: 'short',
+        day: 'numeric',
+        hour: '2-digit',
+        minute: '2-digit',
+      });
+    }
+    // e.g. "May 28, 2026, 14:32"
+    return d.toLocaleString(undefined, {
+      year: 'numeric',
+      month: 'short',
+      day: 'numeric',
+      hour: '2-digit',
+      minute: '2-digit',
+    });
+  }
+
+  // ── Existing-card mutations (auto-save on each change) ─────────────────────
+
+  updateTag(id: string, tag: string): void {
+    this.patchEdited(id, { tag });
+    this.flushExisting(id);
+  }
+
+  updateDescription(id: string, description: string): void {
+    this.patchEdited(id, { description });
+    // Description flush deferred to (blur) to avoid PUT per keystroke.
+  }
+
+  updateDone(id: string, is_done: boolean): void {
+    this.patchEdited(id, { is_done });
+    this.flushExisting(id);
+  }
+
+  updateDifficulty(id: string, delta: number): void {
+    const next = clampDifficulty(this.editedFor(id).difficulty + delta);
+    this.patchEdited(id, { difficulty: next });
+    this.flushExisting(id);
+  }
+
+  private patchEdited(id: string, patch: Partial<EditedValue>): void {
+    this.editedValues.update((m) => {
+      const v = m.get(id);
+      if (!v) return m;
+      const next = new Map(m);
+      next.set(id, { ...v, ...patch });
+      return next;
+    });
+  }
+
+  flushExisting(id: string): void {
+    const v = this.editedFor(id);
+    if (!v.tag) return; // Skip empty saves
+    this.save.emit({
+      id,
+      tag: v.tag,
+      description: v.description,
+      is_done: v.is_done,
+      difficulty: v.difficulty,
+    });
+  }
+
+  onDelete(id: string): void {
+    this.delete.emit(id);
+  }
+
+  // ── Create-card mutations ──────────────────────────────────────────────────
+
+  updateNewTag(tag: string): void {
+    this.newValue.update((v) => ({ ...v, tag }));
+  }
+
+  updateNewDescription(description: string): void {
+    this.newValue.update((v) => ({ ...v, description }));
+  }
+
+  updateNewDone(is_done: boolean): void {
+    this.newDoneEdited = true;
+    this.newValue.update((v) => ({ ...v, is_done }));
+  }
+
+  updateNewDifficulty(delta: number): void {
+    this.newValue.update((v) => ({ ...v, difficulty: clampDifficulty(v.difficulty + delta) }));
+  }
+
+  submitNew(): void {
+    const v = this.newValue();
+    if (!v.tag) return;
+    this.save.emit({
+      id: null,
+      tag: v.tag,
+      description: v.description,
+      is_done: v.is_done,
+      difficulty: v.difficulty,
+    });
+    this.close.emit();
+  }
+
+  // ── Scroll handling ────────────────────────────────────────────────────────
+
+  onCardClick(idx: number): void {
+    if (idx !== this.activeIdx()) {
+      this.scrollToChild(idx, true);
+    }
+  }
+
+  /** Close the carousel when the user clicks anywhere that isn't a real card. */
+  onBackdropClick(event: MouseEvent): void {
+    const target = event.target as HTMLElement | null;
+    if (target && !target.closest('.card:not(.placeholder)')) {
+      this.close.emit();
+    }
+  }
+
+  onScroll(): void {
+    const token = ++this.scrollToken;
+    setTimeout(() => {
+      if (token === this.scrollToken) this.adjustPosition();
+    }, 150);
+  }
+
+  @HostListener('window:resize')
+  onResize(): void {
+    this.scrollToChild(this.activeIdx(), false);
+  }
+
+  private scrollToChild(idx: number, smooth: boolean): void {
+    const container = this.container()?.nativeElement;
+    if (!container) return;
+    const card = container.children.item(idx) as HTMLElement | null;
+    if (!card) return;
+    const left =
+      card.offsetLeft - (container.clientWidth - card.offsetWidth) / 2;
+    container.scrollTo({ left, behavior: smooth ? 'smooth' : 'auto' });
+    this.activeIdx.set(idx);
+  }
+
+  private adjustPosition(): void {
+    const container = this.container()?.nativeElement;
+    if (!container) return;
+    const center = container.scrollLeft + container.clientWidth / 2;
+    let nearestIdx = 1;
+    let minDist = Infinity;
+    // children[0] and children[last] are the placeholders — skip.
+    for (let i = 1; i < container.children.length - 1; i++) {
+      const child = container.children.item(i) as HTMLElement;
+      const c = child.offsetLeft + child.offsetWidth / 2;
+      const d = Math.abs(c - center);
+      if (d < minDist) {
+        minDist = d;
+        nearestIdx = i;
+      }
+    }
+    if (nearestIdx !== this.activeIdx()) {
+      this.scrollToChild(nearestIdx, true);
+    }
+  }
+}

frontend/src/app/components/modal/block-edit.component.vitest.ts

@@ -0,0 +1,14 @@
+import { describe, expect, it } from 'vitest';
+import { createDoneValue } from './block-edit.component';
+
+describe('createDoneValue', () => {
+  it('uses the create-card default before the user edits the checkbox', () => {
+    expect(createDoneValue(false, true, false)).toBe(false);
+    expect(createDoneValue(true, false, false)).toBe(true);
+  });
+
+  it('keeps the user-edited checkbox value', () => {
+    expect(createDoneValue(false, true, true)).toBe(true);
+    expect(createDoneValue(true, false, true)).toBe(false);
+  });
+});

frontend/src/app/components/modal/modal.component.ts

@@ -0,0 +1,124 @@
+import {
+  Component,
+  ChangeDetectionStrategy,
+  output,
+  input,
+  signal,
+  AfterViewInit,
+  OnDestroy,
+  viewChild,
+  ElementRef,
+  inject,
+} from '@angular/core';
+import { A11yModule } from '@angular/cdk/a11y';
+import { ModalStateService } from '../../services/modal-state.service';
+
+@Component({
+  selector: 'lt-modal',
+  standalone: true,
+  imports: [A11yModule],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    <section
+      class="modal"
+      [class.active]="active()"
+      (click)="onBackdropClick($event)"
+      (keydown.enter)="onBackdropClick($any($event))"
+      tabindex="-1"
+    >
+      <div
+        class="modal__dialog"
+        #dialog
+        role="dialog"
+        aria-modal="true"
+        [attr.aria-labelledby]="labelledBy()"
+        [attr.aria-describedby]="describedBy()"
+        cdkTrapFocus
+        cdkTrapFocusAutoCapture
+        (keydown.escape)="onClose()"
+      >
+        <ng-content></ng-content>
+      </div>
+    </section>
+  `,
+  styles: `
+    @import '../../../library/main';
+
+    /* Keep the component host out of parent flex/grid flow. Parent containers
+       apply spacing to direct children, so relying on the fixed child alone can
+       still let <lt-modal> become a layout item when it mounts. */
+    :host {
+      position: fixed;
+      inset: 0;
+      z-index: 10000;
+      display: block;
+      margin: 0 !important;
+    }
+
+    section.modal {
+      position: absolute;
+      inset: 0;
+      @include center-child();
+      padding: var(--large-padding);
+      box-sizing: border-box;
+      background: rgba(255, 248, 248, 0.94);
+      transition: opacity 300ms;
+      opacity: 1;
+      overflow-y: auto;
+
+      @media (max-width: $mobile-width) {
+        padding: var(--medium-padding);
+      }
+
+      @media (max-height: $min-height) {
+        align-items: flex-start;
+      }
+
+      &:not(.active) {
+        opacity: 0;
+        pointer-events: none;
+      }
+
+      button {
+        margin-top: var(--medium-padding);
+      }
+    }
+  `,
+})
+export class ModalComponent implements AfterViewInit, OnDestroy {
+  readonly labelledBy = input<string | null>(null);
+  readonly describedBy = input<string | null>(null);
+  readonly close = output<void>();
+
+  // The active signal starts false; AfterViewInit flips it true on next tick
+  // so the 300ms opacity transition fires on entry (0 → 1).
+  readonly active = signal(false);
+
+  private readonly dialogRef = viewChild<ElementRef<HTMLElement>>('dialog');
+  private previousFocus: HTMLElement | null = null;
+  private readonly modalState = inject(ModalStateService);
+
+  ngAfterViewInit(): void {
+    this.previousFocus = document.activeElement as HTMLElement;
+    // Track open state so towers can be locked while any modal is mounted.
+    this.modalState.open();
+    // Defer one tick so the opacity transition runs (0 → 1).
+    setTimeout(() => this.active.set(true), 0);
+  }
+
+  ngOnDestroy(): void {
+    this.modalState.close();
+    this.previousFocus?.focus();
+  }
+
+  onBackdropClick(event: MouseEvent): void {
+    const dialog = this.dialogRef()?.nativeElement;
+    if (dialog && !dialog.contains(event.target as Node)) {
+      this.onClose();
+    }
+  }
+
+  onClose(): void {
+    this.close.emit();
+  }
+}

frontend/src/app/components/modal/settings.component.ts

@@ -0,0 +1,318 @@
+import {
+  Component,
+  ChangeDetectionStrategy,
+  input,
+  output,
+  signal,
+  computed,
+  effect,
+} from '@angular/core';
+import { Page } from '../../models';
+import { ToggleComponent } from '../shared/toggle/toggle.component';
+
+export interface UpdatePagePayload {
+  name: string;
+  hide_create_tower_button: boolean;
+  keep_tasks_open: boolean;
+}
+
+@Component({
+  selector: 'lt-settings',
+  standalone: true,
+  imports: [ToggleComponent],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    <div class="card">
+      <button class="exit" type="button" (click)="close.emit()" aria-label="Close"></button>
+      <h2>Settings</h2>
+
+      @if (page()) {
+        <section class="page-section">
+          <h3>This page</h3>
+
+          <input
+            type="text"
+            [value]="pageName()"
+            (blur)="onRenamePage($any($event.target))"
+            placeholder="Page name…"
+            maxlength="200"
+            autocomplete="off"
+            aria-label="Page name"
+          />
+
+          <div class="toggle-list">
+            <lt-toggle
+              class="setting-toggle"
+              [checked]="hideCreateTowerButton()"
+              (checkedChange)="onHideCreateTowerButtonChange($event)"
+              offLabel="Show add-tower button"
+              onLabel="Hide add-tower button"
+            />
+
+            <lt-toggle
+              class="setting-toggle"
+              [checked]="keepTasksOpen()"
+              (checkedChange)="onKeepTasksOpenChange($event)"
+              offLabel="Show tasks collapsed"
+              onLabel="Keep tasks open"
+            />
+          </div>
+
+          <button class="danger" type="button" (click)="deletePage.emit()">
+            Delete this page
+          </button>
+        </section>
+
+        <hr />
+      }
+
+      <section class="account-section">
+        <h3>Account</h3>
+
+        <p class="hint">Copy this token to another device to permanently sync your progress</p>
+        <div class="token-row">
+          <input
+            type="text"
+            readonly
+            [value]="token()"
+            aria-label="Your account token"
+          />
+          <button type="button" (click)="onCopy()">Copy</button>
+        </div>
+
+        <p class="hint">Paste a token to switch accounts</p>
+        <div class="token-row">
+          <input
+            type="text"
+            [class.error]="tokenInputTouched() && tokenInput() && !isValidToken()"
+            placeholder="Paste a UUID…"
+            [value]="tokenInput()"
+            (input)="onTokenInput($any($event.target).value)"
+            (blur)="tokenInputTouched.set(true)"
+            aria-label="Paste token to switch account"
+          />
+          <button type="button" [disabled]="!isValidToken()" (click)="onSwitch()">
+            Switch
+          </button>
+        </div>
+        @if (tokenInputTouched() && tokenInput() && !isValidToken()) {
+          <p class="error-message">Not a valid token. Must be a UUIDv4.</p>
+        }
+      </section>
+    </div>
+  `,
+  styles: `
+    @import '../../../library/main';
+
+    :host {
+      display: block;
+    }
+
+    .card {
+      @include card();
+      width: 66vw;
+      max-width: 480px;
+      @media (max-width: $mobile-width) {
+        width: 88vw;
+        max-width: 88vw;
+        padding: var(--medium-padding);
+      }
+      box-sizing: border-box;
+      padding: var(--large-padding);
+      position: relative;
+      box-shadow: $shadow;
+      text-align: left;
+
+      .exit {
+        position: absolute;
+        top: var(--medium-padding);
+        right: var(--medium-padding);
+        @include exit();
+      }
+
+      h2 {
+        margin: 0 0 var(--large-padding) 0;
+        padding: 0 36px;
+        line-height: 1.3;
+        text-align: center;
+      }
+
+      h3 {
+        margin: 0 0 var(--medium-padding) 0;
+        font-size: var(--medium-font-size);
+        line-height: 1.35;
+      }
+
+      section {
+        @include inner-spacing(var(--medium-padding));
+        margin-bottom: var(--large-padding);
+
+        &:last-child {
+          margin-bottom: 0;
+        }
+      }
+
+      hr {
+        border: 0;
+        border-top: 1px solid rgba(0, 0, 0, 0.08);
+        margin: var(--large-padding) 0;
+      }
+
+      input[type='text'],
+      button:not(.exit) {
+        font-size: var(--medium-font-size);
+        line-height: 1.35;
+      }
+
+      .toggle-list {
+        display: flex;
+        flex-direction: column;
+        gap: var(--small-padding);
+      }
+
+      lt-toggle.setting-toggle {
+        --toggle-label-width: 145px;
+
+        box-sizing: border-box;
+        justify-content: center;
+        width: 100%;
+        min-height: 52px;
+        padding: var(--small-padding);
+        border-radius: var(--border-radius);
+        background: rgba($text-color, 0.035);
+
+        @media (max-width: $mobile-width) {
+          min-height: 48px;
+        }
+      }
+
+      .hint {
+        font-size: var(--medium-font-size);
+        line-height: 1.35;
+        color: rgba($text-color, 0.7);
+        margin: 0 0 4px 0;
+      }
+
+      .token-row {
+        display: flex;
+        gap: var(--small-padding);
+        align-items: center;
+
+        input {
+          flex: 1;
+          min-width: 0;
+          text-align: left;
+        }
+
+        button {
+          margin: 0;
+          flex: 0 0 auto;
+          max-width: 100%;
+        }
+
+        @media (max-width: $mobile-width) {
+          flex-wrap: wrap;
+          input { width: 100%; }
+          button { margin-left: auto; }
+        }
+      }
+
+      input.error {
+        box-shadow: 0 1px #b53f3f;
+      }
+
+      .error-message {
+        color: #b53f3f;
+        font-size: var(--small-font-size);
+        margin-top: 4px;
+      }
+
+      button.danger {
+        color: #b53f3f;
+        border-bottom-color: #b53f3f55;
+
+        &:after {
+          background-color: #b53f3f;
+        }
+      }
+    }
+  `,
+})
+export class SettingsComponent {
+  readonly token = input.required<string>();
+  readonly page = input<Page | null>(null);
+
+  readonly close = output<void>();
+  readonly switchAccount = output<string>();
+  readonly updatePage = output<UpdatePagePayload>();
+  readonly deletePage = output<void>();
+
+  // Page-settings state — seeded from page() input
+  readonly pageName = signal('');
+  readonly hideCreateTowerButton = signal(false);
+  readonly keepTasksOpen = signal(false);
+
+  private static readonly UUIDV4_RE =
+    /^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i;
+
+  // Token-switch state
+  readonly tokenInput = signal('');
+  readonly tokenInputTouched = signal(false);
+  readonly isValidToken = computed(() =>
+    SettingsComponent.UUIDV4_RE.test(this.tokenInput()),
+  );
+
+  constructor() {
+    effect(() => {
+      const p = this.page();
+      if (p) {
+        this.pageName.set(p.name);
+        this.hideCreateTowerButton.set(p.hide_create_tower_button);
+        this.keepTasksOpen.set(p.keep_tasks_open);
+      }
+    });
+  }
+
+  onRenamePage(input: HTMLInputElement): void {
+    const trimmed = input.value.trim();
+    if (!trimmed) {
+      input.value = this.pageName();
+      return;
+    }
+    this.pageName.set(trimmed);
+    input.value = trimmed;
+    this.flushPageUpdate();
+  }
+
+  onHideCreateTowerButtonChange(value: boolean): void {
+    this.hideCreateTowerButton.set(value);
+    this.flushPageUpdate();
+  }
+
+  onKeepTasksOpenChange(value: boolean): void {
+    this.keepTasksOpen.set(value);
+    this.flushPageUpdate();
+  }
+
+  private flushPageUpdate(): void {
+    this.updatePage.emit({
+      name: this.pageName(),
+      hide_create_tower_button: this.hideCreateTowerButton(),
+      keep_tasks_open: this.keepTasksOpen(),
+    });
+  }
+
+  onCopy(): void {
+    navigator.clipboard.writeText(this.token()).catch(() => {});
+  }
+
+  onTokenInput(value: string): void {
+    this.tokenInput.set(value.trim());
+  }
+
+  onSwitch(): void {
+    if (!this.isValidToken()) return;
+    this.switchAccount.emit(this.tokenInput());
+    this.close.emit();
+  }
+}

frontend/src/app/components/modal/tower-settings.component.ts

@@ -0,0 +1,163 @@
+import {
+  Component,
+  ChangeDetectionStrategy,
+  input,
+  output,
+  OnInit,
+  inject,
+  DestroyRef,
+} from '@angular/core';
+import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
+import { FormBuilder, ReactiveFormsModule, Validators } from '@angular/forms';
+import { Tower, HslColor } from '../../models';
+import { ColorPickerComponent } from '../shared/color-picker/color-picker.component';
+
+export interface TowerSettingsResult {
+  name: string;
+  base_color: HslColor;
+}
+
+@Component({
+  selector: 'lt-tower-settings',
+  standalone: true,
+  imports: [ReactiveFormsModule, ColorPickerComponent],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    <button class="exit" type="button" (click)="close.emit()" aria-label="Close"></button>
+
+    <form [formGroup]="form" (ngSubmit)="onSubmit()">
+      <input
+        id="ts-name"
+        name="towerName"
+        type="text"
+        formControlName="name"
+        [placeholder]="tower() ? 'Tower name…' : 'New tower'"
+        maxlength="200"
+        autocomplete="off"
+        class="title-input"
+      />
+
+      <div class="picker-row">
+        <lt-color-picker [color]="currentColor" (colorChange)="onColorChange($event)" />
+      </div>
+
+      @if (tower()) {
+        <!-- Editing an existing tower: changes auto-save, so there's no Save
+             button — only the destructive action remains explicit. -->
+        <button type="button" (click)="delete.emit()">Delete tower</button>
+      } @else {
+        <button type="submit" [disabled]="form.invalid">Create tower</button>
+      }
+    </form>
+  `,
+  styles: `
+    @import '../../../library/main';
+
+    :host {
+      @include card();
+      width: 66vw;
+      max-width: 400px;
+      @media (max-width: $mobile-width) {
+        width: 88vw;
+        max-width: 88vw;
+        padding: var(--medium-padding);
+      }
+      box-sizing: border-box;
+      padding: var(--large-padding);
+      padding-top: calc(var(--large-padding) + var(--medium-padding));
+      position: relative;
+      box-shadow: $shadow;
+      display: block;
+
+      .exit {
+        position: absolute;
+        top: var(--medium-padding);
+        right: var(--medium-padding);
+        @include exit();
+      }
+
+      form {
+        @include inner-spacing(var(--large-padding));
+      }
+
+      .title-input {
+        @include title-text();
+        text-align: center;
+        width: 100%;
+        background: transparent;
+        border: 0;
+      }
+
+      button {
+        display: block;
+        // Stay full-width on mobile, but switch to flex so forms.scss's
+        // bottom-alignment keeps the underline hugging the label in the 42px
+        // tap target (plain block centres the text and strands the underline).
+        @media (max-width: $mobile-width) {
+          display: flex;
+        }
+      }
+    }
+  `,
+})
+export class TowerSettingsComponent implements OnInit {
+  readonly tower = input<Tower | null>(null);
+  readonly save = output<TowerSettingsResult>();
+  readonly delete = output<void>();
+  readonly close = output<void>();
+
+  private readonly fb = inject(FormBuilder);
+  private readonly destroyRef = inject(DestroyRef);
+
+  form = this.fb.group({
+    name: ['', [Validators.required, Validators.maxLength(200)]],
+  });
+
+  currentColor: HslColor = randomDefaultColor();
+
+  ngOnInit(): void {
+    const t = this.tower();
+    if (t) {
+      this.form.patchValue({ name: t.name });
+      this.currentColor = { ...t.base_color };
+
+      // Edit mode: persist name changes as they happen. Wire this up *after*
+      // the initial patchValue so seeding the form doesn't fire a save.
+      this.form.valueChanges
+        .pipe(takeUntilDestroyed(this.destroyRef))
+        .subscribe(() => this.autoSave());
+    }
+  }
+
+  onColorChange(color: HslColor): void {
+    this.currentColor = color;
+    // In edit mode the picker is a live control — commit each change.
+    if (this.tower()) this.autoSave();
+  }
+
+  onSubmit(): void {
+    // Only the create flow reaches here via its Submit button; edit mode
+    // auto-saves (and Enter on the single field is a harmless redundant save).
+    this.tryEmitSave();
+  }
+
+  private autoSave(): void {
+    this.tryEmitSave();
+  }
+
+  private tryEmitSave(): void {
+    if (this.form.invalid) return;
+    this.emitSave();
+  }
+
+  private emitSave(): void {
+    this.save.emit({ name: this.form.value.name ?? '', base_color: this.currentColor });
+  }
+}
+
+function randomDefaultColor(): HslColor {
+  // Pick a hue in [0°, 30°] ∪ [200°, 360°] — warm or cool, avoid green.
+  const warm = Math.random() < 0.5;
+  const hueDeg = warm ? Math.random() * 30 : 200 + Math.random() * 160;
+  return { h: hueDeg / 360, s: 0.7, l: 0.55 };
+}

frontend/src/app/components/page/page.component.html

@@ -0,0 +1,79 @@
+<section
+  class="towers"
+  cdkDropList
+  cdkDropListOrientation="horizontal"
+  (cdkDropListDropped)="onTowerDropped($event)"
+>
+  @for (tower of page().towers; track tower.id) {
+    <lt-tower
+      cdkDrag
+      [cdkDragDisabled]="modalOpen() || mobileDragDisabled()"
+      [tower]="tower"
+      [dateRange]="dateRange()"
+      [keepTasksOpen]="page().keep_tasks_open"
+      [animateInitialStack]="animateInitialStack()"
+      (cdkDragStarted)="onTowerDragStart(tower.id)"
+      (updateTower)="onUpdateTower(tower.id, $event)"
+      (deleteTowerRequest)="onDeleteTower(tower.id)"
+      (saveBlock)="onSaveBlock(tower.id, $event)"
+      (addBlock)="onAddBlock(tower.id, $event)"
+      (deleteBlock)="onDeleteBlock(tower.id, $event)"
+    />
+  }
+  @if (!page().hide_create_tower_button) {
+    <div class="add-tower-wrapper">
+      <img
+        class="add-tower"
+        src="assets/plus-sign.svg"
+        alt="Add tower"
+        role="button"
+        tabindex="0"
+        (click)="showAddTower.set(true)"
+        (keydown.enter)="showAddTower.set(true)"
+        (keydown.space)="$event.preventDefault(); showAddTower.set(true)"
+      />
+    </div>
+  }
+</section>
+
+<!-- Trash zone is positioned relative to :host, not .towers — matches legacy. -->
+<img
+  class="trash"
+  src="assets/trash.svg"
+  alt="Delete tower"
+  [class.active]="isDragging()"
+  (pointerenter)="onTrashEnter()"
+  (pointerleave)="onTrashLeave()"
+/>
+
+@if (showSlider()) {
+  <div class="double-slider-container" [class.transparent]="isDragging()">
+    <lt-double-slider
+      [values]="blockDates()"
+      [labels]="dateLabels()"
+      (rangeChange)="onSliderRangeChange($event)"
+    />
+  </div>
+}
+
+@if (showAddTower()) {
+  <lt-modal title="New Tower" (close)="showAddTower.set(false)">
+    <lt-tower-settings [tower]="null" (save)="onAddTower($event)" (close)="showAddTower.set(false)" />
+  </lt-modal>
+}
+
+@if (confirmDeleteTowerId(); as towerId) {
+  <lt-modal (close)="cancelTowerDelete()">
+    <div class="confirm-delete">
+      <div class="header">
+        <button class="exit" type="button" (click)="cancelTowerDelete()" aria-label="Cancel"></button>
+        <h2>Delete tower</h2>
+      </div>
+      <p>Delete <strong>{{ confirmDeleteTowerName() || 'this tower' }}</strong> and all of its blocks? This can't be undone.</p>
+      <div class="confirm-buttons">
+        <button type="button" (click)="cancelTowerDelete()">Cancel</button>
+        <button type="button" class="danger" (click)="confirmTowerDelete()">Delete tower</button>
+      </div>
+    </div>
+  </lt-modal>
+}

frontend/src/app/components/page/page.component.scss

@@ -0,0 +1,183 @@
+@import '../../../library/main';
+
+:host {
+  display: flex;
+  flex-direction: column;
+
+  height: 100%;
+  min-height: 0;
+  position: relative; // anchor for absolute-positioned .trash
+
+  @include inner-spacing(var(--large-padding));
+
+  button {
+    margin-top: 0;
+  }
+
+  .towers {
+    display: flex;
+    justify-content: center;
+
+    width: 100%;
+    box-sizing: border-box;
+    margin-left: auto;
+    margin-right: auto;
+
+    flex: 1 1 auto;
+    min-height: 0;
+
+    transition: box-shadow $short-animation-time;
+
+    max-width: 100%;
+    gap: var(--medium-padding);
+
+    &.cdk-drop-list-dragging {
+      *:not(.cdk-drag-placeholder) {
+        transition: transform $long-animation-time cubic-bezier(0, 0, 0.2, 1);
+      }
+    }
+
+    .add-tower-wrapper {
+      @include center-child();
+      img.add-tower {
+        height: 48px;
+        @media (max-width: $mobile-width) {
+          height: 32px;
+        }
+
+        opacity: 0.33;
+        transition: opacity $long-animation-time;
+        cursor: pointer;
+
+        &:hover {
+          opacity: 1;
+        }
+      }
+    }
+
+    & > * {
+      width: 100%;
+      max-width: 200px;
+      box-sizing: border-box;
+      flex: 1 1 0;
+      min-width: 0;
+      min-height: 0;
+    }
+
+    position: relative;
+
+    // Mobile: fixed-width towers with horizontal scroll (1.5-column rhythm).
+    @media (max-width: $mobile-width) {
+      --mobile-tower-width: calc(66vw - var(--small-padding));
+      --mobile-tower-side-padding: max(
+        var(--medium-padding),
+        calc((100% - var(--mobile-tower-width)) / 2)
+      );
+
+      overflow-x: auto;
+      overflow-y: visible;
+      -webkit-overflow-scrolling: touch;
+      scroll-snap-type: x mandatory;
+      scroll-padding-inline: var(--mobile-tower-side-padding);
+      flex-wrap: nowrap;
+      justify-content: flex-start;
+      padding: 0 var(--mobile-tower-side-padding);
+      max-width: 100%;
+      gap: var(--medium-padding);
+
+      &::-webkit-scrollbar {
+        display: none;
+      }
+
+      & > * {
+        width: var(--mobile-tower-width) !important;
+        max-width: var(--mobile-tower-width) !important;
+        min-width: var(--mobile-tower-width) !important;
+        scroll-snap-align: center;
+        flex: 0 0 var(--mobile-tower-width);
+      }
+    }
+  }
+
+  .double-slider-container {
+    width: 100%;
+    transition: opacity $long-animation-time;
+    @media (max-height: $min-height) { display: none; }
+    &.transparent { opacity: 0; pointer-events: none; }
+  }
+
+  .confirm-delete {
+    @include card();
+    width: 66vw;
+    max-width: 500px;
+    @media (max-width: $mobile-width) {
+      width: 88vw;
+      max-width: 88vw;
+      padding: var(--medium-padding);
+    }
+    box-sizing: border-box;
+    padding: var(--large-padding);
+    position: relative;
+    box-shadow: $shadow;
+    @include inner-spacing(var(--large-padding));
+    text-align: center;
+
+    .header {
+      @include center-child();
+      .exit {
+        position: absolute;
+        right: var(--large-padding);
+        @include exit();
+      }
+    }
+
+    p {
+      strong { font-weight: bold; }
+    }
+
+    .confirm-buttons {
+      display: flex;
+      justify-content: center;
+      gap: var(--large-padding);
+
+      button {
+        max-width: 100%;
+      }
+
+      button.danger {
+        color: #b53f3f;
+        border-bottom-color: #b53f3f55;
+        &:after { background-color: #b53f3f; }
+      }
+
+      @media (max-width: $mobile-width) {
+        flex-direction: column;
+        gap: var(--small-padding);
+        button { width: 100%; }
+      }
+    }
+  }
+
+  img.trash {
+    @include square(48px);
+    padding: 16px;
+
+    position: absolute;
+    z-index: 1500;
+    bottom: 8px;
+    left: 50%;
+    margin: 0 !important;
+
+    transform: translateX(-50%) scale(0);
+
+    transition: transform $long-animation-time;
+
+    &.active {
+      transform: translateX(-50%) scale(1);
+    }
+
+    &:hover {
+      transform: translateX(-50%) scale(1.1);
+    }
+  }
+}

frontend/src/app/components/page/page.component.ts

@@ -0,0 +1,229 @@
+import {
+  Component,
+  ChangeDetectionStrategy,
+  input,
+  output,
+  signal,
+  computed,
+  inject,
+  HostListener,
+  effect,
+  untracked,
+} from '@angular/core';
+import { Page } from '../../models';
+import { StoreService } from '../../services/store.service';
+import { TowerComponent } from '../tower/tower.component';
+import { ModalComponent } from '../modal/modal.component';
+import { TowerSettingsComponent, TowerSettingsResult } from '../modal/tower-settings.component';
+import {
+  DoubleSliderComponent,
+  DoubleSliderRange,
+} from '../shared/double-slider/double-slider.component';
+import { CdkDropList, CdkDrag, CdkDragDrop } from '@angular/cdk/drag-drop';
+import { ModalStateService } from '../../services/modal-state.service';
+
+// ── Relative-time helpers ──────────────────────────────────────────────────
+
+const rtf = new Intl.RelativeTimeFormat(undefined, { numeric: 'auto', style: 'short' });
+
+function formatRelative(ts: number, nowSec: number): string {
+  const diff = ts - nowSec; // negative = past
+  const absDiff = Math.abs(diff);
+  if (absDiff < 45) return rtf.format(Math.round(diff), 'second');
+  if (absDiff < 60 * 45) return rtf.format(Math.round(diff / 60), 'minute');
+  if (absDiff < 60 * 60 * 22) return rtf.format(Math.round(diff / 3600), 'hour');
+  if (absDiff < 86400 * 26) return rtf.format(Math.round(diff / 86400), 'day');
+  if (absDiff < 86400 * 320) return rtf.format(Math.round(diff / 86400 / 30), 'month');
+  return rtf.format(Math.round(diff / 86400 / 365), 'year');
+}
+
+interface BlockPatch {
+  tag: string;
+  description: string;
+  is_done: boolean;
+  difficulty: number;
+}
+
+/** Minimum blocks before the date-range slider becomes visible. */
+const MIN_BLOCKS_FOR_SLIDER = 2;
+
+@Component({
+  selector: 'lt-page',
+  standalone: true,
+  imports: [
+    TowerComponent,
+    ModalComponent,
+    TowerSettingsComponent,
+    DoubleSliderComponent,
+    CdkDropList,
+    CdkDrag,
+  ],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  templateUrl: './page.component.html',
+  styleUrl: './page.component.scss',
+})
+export class PageComponent {
+  readonly page = input.required<Page>();
+  readonly animateInitialStack = input<boolean>(false);
+  readonly dragHappening = output<boolean>();
+
+  protected readonly store = inject(StoreService);
+  private readonly modalState = inject(ModalStateService);
+  /** True while any lt-modal is mounted — used to lock tower drag. */
+  readonly modalOpen = this.modalState.anyOpen;
+  readonly mobileDragDisabled = signal(this.isMobileViewport());
+
+  readonly showAddTower = signal(false);
+  readonly isDragging = signal(false);
+  /** When set, opens a confirmation modal before the dragged tower is deleted. */
+  readonly confirmDeleteTowerId = signal<string | null>(null);
+  private draggedTowerId: string | null = null;
+  private nearTrashcan = false;
+
+  readonly confirmDeleteTowerName = computed(() => {
+    const id = this.confirmDeleteTowerId();
+    if (!id) return '';
+    return this.page().towers.find((t) => t.id === id)?.name ?? '';
+  });
+
+  // ── Date-range slider state ────────────────────────────────────────────────
+
+  /** Sorted unique `created_at` timestamps (seconds) across all done blocks
+   *  in this page. Empty list when no blocks yet. */
+  readonly blockDates = computed<number[]>(() => {
+    const set = new Set<number>();
+    for (const tower of this.page().towers) {
+      for (const b of tower.blocks) if (b.is_done) set.add(b.created_at);
+    }
+    return [...set].sort((a, b) => a - b);
+  });
+
+  /** Date labels formatted for slider display (deduplicated, insertion order). */
+  readonly dateLabels = computed<string[]>(() => {
+    const now = Math.floor(Date.now() / 1000);
+    const seen = new Set<string>();
+    const labels: string[] = [];
+    for (const t of this.blockDates()) {
+      const lbl = formatRelative(t, now);
+      if (!seen.has(lbl)) {
+        seen.add(lbl);
+        labels.push(lbl);
+      }
+    }
+    return labels;
+  });
+
+  readonly showSlider = computed(() => this.blockDates().length >= MIN_BLOCKS_FOR_SLIDER);
+
+  /** Selected date range — `null` = show everything. */
+  readonly dateRange = signal<{ from: number; to: number } | null>(null);
+
+  constructor() {
+    effect(() => {
+      if (!this.showSlider()) {
+        untracked(() => this.dateRange.set(null));
+      }
+    });
+  }
+
+  onSliderRangeChange(range: DoubleSliderRange<unknown>): void {
+    this.dateRange.set({ from: range.from as number, to: range.to as number });
+  }
+
+  @HostListener('window:resize')
+  onResize(): void {
+    this.mobileDragDisabled.set(this.isMobileViewport());
+  }
+
+  private isMobileViewport(): boolean {
+    return (
+      typeof window !== 'undefined' &&
+      window.matchMedia('(max-width: 520px), (pointer: coarse)').matches
+    );
+  }
+
+  // ── Tower mutations ────────────────────────────────────────────────────────
+
+  onAddTower(result: TowerSettingsResult): void {
+    this.showAddTower.set(false);
+    this.store.addTower(this.page().id, result.name, result.base_color);
+  }
+
+  onUpdateTower(towerId: string, result: TowerSettingsResult): void {
+    this.store.updateTower(this.page().id, towerId, {
+      name: result.name,
+      base_color: result.base_color,
+    });
+  }
+
+  onDeleteTower(towerId: string): void {
+    this.confirmDeleteTowerId.set(towerId);
+  }
+
+  // ── Block mutations ────────────────────────────────────────────────────────
+
+  onAddBlock(towerId: string, result: BlockPatch): void {
+    this.store.addBlock(
+      this.page().id,
+      towerId,
+      result.tag,
+      result.description,
+      result.is_done,
+      result.difficulty,
+    );
+  }
+
+  onSaveBlock(towerId: string, event: { blockId: string; result: BlockPatch }): void {
+    this.store.updateBlock(this.page().id, towerId, event.blockId, event.result);
+  }
+
+  onDeleteBlock(towerId: string, blockId: string): void {
+    this.store.deleteBlock(this.page().id, towerId, blockId);
+  }
+
+  // ── Drag-and-drop + trash ──────────────────────────────────────────────────
+
+  onTowerDragStart(towerId: string): void {
+    this.draggedTowerId = towerId;
+    this.isDragging.set(true);
+    this.dragHappening.emit(true);
+  }
+
+  onTowerDropped(event: CdkDragDrop<unknown>): void {
+    this.isDragging.set(false);
+    this.dragHappening.emit(false);
+    if (this.nearTrashcan && this.draggedTowerId) {
+      // Open confirm dialog instead of deleting immediately.
+      this.confirmDeleteTowerId.set(this.draggedTowerId);
+    } else if (event.previousIndex !== event.currentIndex) {
+      this.store.reorderTowers(this.page().id, event.previousIndex, event.currentIndex);
+    }
+    this.draggedTowerId = null;
+    this.nearTrashcan = false;
+  }
+
+  confirmTowerDelete(): void {
+    const id = this.confirmDeleteTowerId();
+    if (id) this.store.deleteTower(this.page().id, id);
+    this.confirmDeleteTowerId.set(null);
+  }
+
+  cancelTowerDelete(): void {
+    this.confirmDeleteTowerId.set(null);
+  }
+
+  onTrashEnter(): void {
+    this.nearTrashcan = true;
+    this.dragPreview()?.classList.add('trash-highlight');
+  }
+
+  onTrashLeave(): void {
+    this.nearTrashcan = false;
+    this.dragPreview()?.classList.remove('trash-highlight');
+  }
+
+  /** The CDK drag preview currently in flight, if any. Matches legacy DOM-driven trash highlight. */
+  private dragPreview(): Element | null {
+    return document.querySelector('.cdk-drag-preview');
+  }
+}

frontend/src/app/components/pages/pages.component.html

@@ -0,0 +1,71 @@
+<div class="select-add-container">
+  <lt-select-add
+    [options]="pageNames()"
+    [selectedIndex]="selectedPageIndex()"
+    placeholder="Add a new page…"
+    (selectionChange)="onSelectPage($event)"
+    (add)="onAddPage($event)"
+  />
+</div>
+
+<div class="page-container">
+  @if (selectedPage(); as page) {
+    <lt-page
+      [page]="page"
+      [animateInitialStack]="page.id === animateInitialStackPageId()"
+      (dragHappening)="dragHappening.set($event)"
+    />
+  } @else {
+    <p>Add a new page to get started!</p>
+  }
+</div>
+
+<button [class.transparent]="dragHappening()" (click)="showSettings.set(true)">
+  Settings
+</button>
+
+@if (showSettings()) {
+  <lt-modal (close)="showSettings.set(false)">
+    <lt-settings
+      [token]="store.token()"
+      [page]="selectedPage()"
+      (close)="showSettings.set(false)"
+      (updatePage)="onUpdatePage($event)"
+      (deletePage)="onRequestRemovePage()"
+      (switchAccount)="onSwitchAccount($event)"
+    />
+  </lt-modal>
+}
+
+@if (confirmDeletePageId()) {
+  <lt-modal (close)="cancelRemovePage()">
+    <div class="confirm-delete">
+      <div class="header">
+        <button class="exit" type="button" (click)="cancelRemovePage()" aria-label="Cancel"></button>
+        <h2>Delete page</h2>
+      </div>
+      <p>
+        Delete <strong>{{ confirmDeletePageName() || 'this page' }}</strong> and all of its towers and blocks?
+        This can't be undone.
+      </p>
+      <div class="confirm-buttons">
+        <button type="button" (click)="cancelRemovePage()">Cancel</button>
+        <button type="button" class="danger" (click)="confirmRemovePage()">Delete page</button>
+      </div>
+    </div>
+  </lt-modal>
+}
+
+@if (showWelcome()) {
+  <lt-modal
+    labelledBy="welcome-title"
+    describedBy="welcome-description"
+    (close)="showWelcome.set(false)"
+  >
+    <lt-welcome
+      (close)="showWelcome.set(false)"
+      (startFresh)="showWelcome.set(false)"
+      (loadExample)="onLoadExample()"
+    />
+  </lt-modal>
+}

frontend/src/app/components/pages/pages.component.scss

@@ -0,0 +1,102 @@
+@import '../../../library/main';
+
+:host {
+  height: 100%;
+  min-height: 0;
+
+  display: flex;
+  flex-direction: column;
+  justify-content: space-between;
+
+  @include inner-spacing(var(--large-padding));
+
+  .select-add-container {
+    width: 250px;
+    margin: 0 auto;
+    position: relative;
+    z-index: 1000;
+    @media (max-width: $mobile-width) {
+      width: 80vw;
+      max-width: 320px;
+    }
+  }
+
+  .page-container {
+    flex: 1 1 auto;
+    min-height: 0;
+    // Generous breathing room between the page selector dropdown and the
+    // towers — the dropdown can open downward without crowding the towers.
+    padding-top: var(--large-padding);
+    @media (max-width: $mobile-width) {
+      padding-top: var(--medium-padding);
+    }
+  }
+
+  button {
+    transition: opacity $long-animation-time;
+
+    &.transparent {
+      opacity: 0;
+    }
+
+    @media (max-width: $mobile-width) {
+      margin-top: var(--medium-padding);
+      font-size: var(--medium-font-size);
+    }
+  }
+
+  .confirm-delete {
+    @include card();
+    width: 66vw;
+    max-width: 500px;
+    @media (max-width: $mobile-width) {
+      width: 88vw;
+      max-width: 88vw;
+      padding: var(--medium-padding);
+    }
+    box-sizing: border-box;
+    padding: var(--large-padding);
+    position: relative;
+    box-shadow: $shadow;
+    @include inner-spacing(var(--large-padding));
+    text-align: center;
+
+    .header {
+      @include center-child();
+
+      .exit {
+        position: absolute;
+        right: var(--large-padding);
+        @include exit();
+      }
+    }
+
+    .confirm-buttons {
+      display: flex;
+      justify-content: center;
+      gap: var(--large-padding);
+
+      button {
+        max-width: 100%;
+      }
+
+      button.danger {
+        color: #b53f3f;
+        border-bottom-color: #b53f3f55;
+
+        &:after {
+          background-color: #b53f3f;
+        }
+      }
+
+      @media (max-width: $mobile-width) {
+        flex-direction: column;
+        gap: var(--small-padding);
+
+        button {
+          width: 100%;
+        }
+      }
+    }
+  }
+}

frontend/src/app/components/pages/pages.component.ts

@@ -0,0 +1,146 @@
+import {
+  Component,
+  ChangeDetectionStrategy,
+  inject,
+  signal,
+  computed,
+  effect,
+  OnDestroy,
+} from '@angular/core';
+import { StoreService } from '../../services/store.service';
+import { PageComponent } from '../page/page.component';
+import { ModalComponent } from '../modal/modal.component';
+import { SettingsComponent, UpdatePagePayload } from '../modal/settings.component';
+import { SelectAddComponent } from '../shared/select-add/select-add.component';
+import { WelcomeComponent } from '../welcome/welcome.component';
+import { Page } from '../../models';
+
+@Component({
+  selector: 'lt-pages',
+  standalone: true,
+  imports: [PageComponent, ModalComponent, SettingsComponent, SelectAddComponent, WelcomeComponent],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  templateUrl: './pages.component.html',
+  styleUrl: './pages.component.scss',
+})
+export class PagesComponent implements OnDestroy {
+  protected readonly store = inject(StoreService);
+
+  /** ID of currently selected page within store.pages(). */
+  private readonly selectedPageId = signal<string | null>(null);
+
+  readonly showSettings = signal(false);
+  readonly dragHappening = signal(false);
+  readonly showWelcome = signal(false);
+  readonly confirmDeletePageId = signal<string | null>(null);
+  readonly animateInitialStackPageId = signal<string | null>(null);
+  private exampleAnimationTimer: ReturnType<typeof setTimeout> | null = null;
+
+  constructor() {
+    effect(() => {
+      const pages = this.store.pages();
+      if (!this.store.loading() && pages.length === 0) {
+        this.showWelcome.set(true);
+      } else if (pages.length > 0) {
+        this.showWelcome.set(false);
+      }
+    });
+  }
+
+  onLoadExample(): void {
+    const pageId = this.store.loadExample();
+    this.selectedPageId.set(pageId);
+    this.animateInitialStackPageId.set(pageId);
+    if (this.exampleAnimationTimer !== null) {
+      clearTimeout(this.exampleAnimationTimer);
+    }
+    this.exampleAnimationTimer = setTimeout(() => {
+      if (this.animateInitialStackPageId() === pageId) {
+        this.animateInitialStackPageId.set(null);
+      }
+      this.exampleAnimationTimer = null;
+    }, 2500);
+    this.showWelcome.set(false);
+  }
+
+  ngOnDestroy(): void {
+    if (this.exampleAnimationTimer !== null) {
+      clearTimeout(this.exampleAnimationTimer);
+    }
+  }
+
+  readonly pageNames = computed(() => this.store.pages().map((p) => p.name));
+
+  readonly selectedPage = computed<Page | null>(() => {
+    const pages = this.store.pages();
+    if (pages.length === 0) return null;
+    const id = this.selectedPageId();
+    if (id) {
+      const found = pages.find((p) => p.id === id);
+      if (found) return found;
+    }
+    // Default to first page.
+    return pages[0] ?? null;
+  });
+
+  readonly confirmDeletePageName = computed(() => {
+    const id = this.confirmDeletePageId();
+    if (!id) return '';
+    return this.store.pages().find((p) => p.id === id)?.name ?? '';
+  });
+
+  readonly selectedPageIndex = computed(() => {
+    const pages = this.store.pages();
+    const page = this.selectedPage();
+    if (!page) return -1;
+    return pages.findIndex((p) => p.id === page.id);
+  });
+
+  onSelectPage(index: number): void {
+    const pages = this.store.pages();
+    const page = pages[index];
+    if (page) {
+      this.selectedPageId.set(page.id);
+    }
+  }
+
+  onAddPage(name: string): void {
+    this.store.addPage(name);
+    // Select the newly added page.
+    const pages = this.store.pages();
+    const newPage = pages[pages.length - 1];
+    if (newPage) {
+      this.selectedPageId.set(newPage.id);
+    }
+  }
+
+  onUpdatePage(payload: UpdatePagePayload): void {
+    const page = this.selectedPage();
+    if (page) {
+      this.store.updatePage(page.id, payload);
+    }
+  }
+
+  onRequestRemovePage(): void {
+    const page = this.selectedPage();
+    if (!page) return;
+    this.confirmDeletePageId.set(page.id);
+  }
+
+  confirmRemovePage(): void {
+    const pageId = this.confirmDeletePageId();
+    if (!pageId) return;
+    this.store.deletePage(pageId);
+    this.selectedPageId.set(null);
+    this.showSettings.set(false);
+    this.confirmDeletePageId.set(null);
+  }
+
+  cancelRemovePage(): void {
+    this.confirmDeletePageId.set(null);
+  }
+
+  onSwitchAccount(token: string): void {
+    this.store.switchToken(token);
+  }
+}

frontend/src/app/components/shared/color-picker/color-picker.component.ts

@@ -0,0 +1,198 @@
+import {
+  Component,
+  ChangeDetectionStrategy,
+  input,
+  output,
+  computed,
+} from '@angular/core';
+import { HslColor } from '../../../models';
+import { toCss } from '../../../utils/color';
+
+// 12 hand-picked hues. Rationale:
+//  – Warm cluster (0–45°): coral/red, orange-red, orange, amber — vivid warm tones
+//  – Skipped 60–180° (yellows + greens) — most read as muddy next to the rose UI accent
+//  – Cool cluster (195–260°): sky-cyan, azure, blue, indigo — clean, distinct from rose
+//  – Purple-rose cluster (280–355°): violet, magenta, rose-pink, near-red — complements the accent
+const PRESETS: number[] = [0, 15, 30, 45, 195, 215, 235, 255, 280, 310, 335, 355];
+
+const FIXED_S = 0.7;
+const FIXED_L = 0.55;
+
+@Component({
+  selector: 'lt-color-picker',
+  standalone: true,
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    <div class="picker">
+      <div class="swatches" role="group" aria-label="Preset colors">
+        @for (h of presetHues; track h) {
+          <button
+            type="button"
+            class="swatch"
+            [class.active]="isActiveHue(h)"
+            [style.background-color]="hueToCss(h)"
+            [attr.aria-label]="'Pick hue ' + h + ' degrees'"
+            [attr.aria-pressed]="isActiveHue(h)"
+            (click)="pickHue(h)"
+          ></button>
+        }
+      </div>
+
+      <div class="hue-slider">
+        <input
+          type="range"
+          min="0"
+          max="360"
+          step="1"
+          [value]="hueDeg()"
+          (input)="onSlider($any($event.target).value)"
+          [style.--thumb-color]="toCss(color())"
+          aria-label="Hue"
+        />
+      </div>
+
+      <div class="preview" [style.background-color]="toCss(color())" aria-hidden="true"></div>
+    </div>
+  `,
+  styles: `
+    @import '../../../../library/main';
+
+    :host {
+      display: block;
+      padding: var(--medium-padding);
+      @include card();
+      border: 1px solid rgba($text-color, 0.14);
+      box-shadow: inset 0 0 0 1px rgba($light-color, 0.7);
+      background-color: rgba($text-color, 0.025);
+      box-sizing: border-box;
+    }
+
+    .picker {
+      display: flex;
+      flex-direction: column;
+      gap: var(--medium-padding);
+      width: 100%;
+    }
+
+    .swatches {
+      display: grid;
+      grid-template-columns: repeat(12, 1fr);
+      gap: 6px;
+
+      @media (max-width: $mobile-width) {
+        grid-template-columns: repeat(6, 1fr);
+        gap: var(--small-padding);
+      }
+
+      .swatch {
+        all: unset;
+        cursor: pointer;
+        aspect-ratio: 1;
+        border-radius: 4px;
+        box-shadow: 0 0 0 1px rgba($text-color, 0.18);
+        transition: transform $short-animation-time, box-shadow $long-animation-time;
+
+        &:hover,
+        &:focus-visible {
+          box-shadow: 0 0 0 2px $light-color, 0 0 0 4px rgba($text-color, 0.5);
+          transform: scale(1.1);
+        }
+
+        &.active {
+          box-shadow: 0 0 0 2px $light-color, 0 0 0 4px rgba($text-color, 0.5);
+          transform: scale(1.15);
+        }
+      }
+    }
+
+    .hue-slider {
+      padding: 8px 0;
+
+      input[type='range'] {
+        -webkit-appearance: none;
+        appearance: none;
+        width: 100%;
+        height: 16px;
+        border-radius: 1000px;
+        background: linear-gradient(
+          to right,
+          hsl(0, 70%, 55%),
+          hsl(60, 70%, 55%),
+          hsl(120, 70%, 55%),
+          hsl(180, 70%, 55%),
+          hsl(240, 70%, 55%),
+          hsl(300, 70%, 55%),
+          hsl(360, 70%, 55%)
+        );
+        outline: none;
+        cursor: pointer;
+
+        &:focus-visible {
+          box-shadow: 0 0 0 3px rgba($text-color, 0.35);
+        }
+
+        &::-webkit-slider-thumb {
+          -webkit-appearance: none;
+          appearance: none;
+          height: 32px;
+          width: 32px;
+          border-radius: 1000px;
+          background-color: var(--thumb-color, #{$light-color});
+          box-shadow: 0 0 0 2px #{$light-color}, #{$shadow};
+          cursor: grab;
+
+          &:active {
+            cursor: grabbing;
+          }
+        }
+
+        &::-moz-range-thumb {
+          height: 32px;
+          width: 32px;
+          border-radius: 1000px;
+          background-color: var(--thumb-color, white);
+          border: 2px solid white;
+          box-shadow: $shadow;
+          cursor: grab;
+
+          &:active {
+            cursor: grabbing;
+          }
+        }
+      }
+    }
+
+    .preview {
+      height: 40px;
+      border-radius: var(--border-radius);
+      box-shadow: 0 0 0 1px rgba($text-color, 0.18);
+    }
+  `,
+})
+export class ColorPickerComponent {
+  readonly color = input.required<HslColor>();
+  readonly colorChange = output<HslColor>();
+
+  readonly presetHues = PRESETS;
+
+  readonly hueDeg = computed(() => Math.round(this.color().h * 360));
+
+  isActiveHue(h: number): boolean {
+    return Math.abs(this.hueDeg() - h) < 8;
+  }
+
+  hueToCss(h: number): string {
+    return `hsl(${h}, 70%, 55%)`;
+  }
+
+  /** Re-exported so the template can call the utility directly. */
+  readonly toCss = toCss;
+
+  pickHue(h: number): void {
+    this.colorChange.emit({ h: h / 360, s: FIXED_S, l: FIXED_L });
+  }
+
+  onSlider(value: string): void {
+    this.colorChange.emit({ h: Number(value) / 360, s: FIXED_S, l: FIXED_L });
+  }
+}

frontend/src/app/components/shared/double-slider/double-slider.component.ts

@@ -0,0 +1,245 @@
+import {
+  Component,
+  ChangeDetectionStrategy,
+  input,
+  output,
+  signal,
+  computed,
+  effect,
+  untracked,
+} from '@angular/core';
+
+export interface DoubleSliderRange<T> {
+  from: T;
+  to: T;
+}
+
+/**
+ * Two-thumb range slider — legacy "double-slider".
+ * Hands an indexed range over an arbitrary values array; emits the
+ * underlying values on each change. Labels magnetically lift as a thumb
+ * approaches them (rotated -30°), per the legacy.
+ */
+@Component({
+  selector: 'lt-double-slider',
+  standalone: true,
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    <div class="container">
+      <label for="ds-1">From</label>
+      <label for="ds-2">To</label>
+      <input
+        id="ds-1"
+        type="range"
+        min="0"
+        [max]="maxIndex()"
+        [value]="oneValue()"
+        (input)="oneValue.set(+$any($event.target).value)"
+      />
+      <input
+        id="ds-2"
+        type="range"
+        min="0"
+        [max]="maxIndex()"
+        [value]="otherValue()"
+        (input)="otherValue.set(+$any($event.target).value)"
+      />
+      <div class="value-container">
+        @for (i of drawnIndices(); track i) {
+          <span [style.transform]="getOffset(i)">{{ drawnLabels()[i] }}</span>
+        }
+      </div>
+    </div>
+  `,
+  styles: `
+    @import '../../../../library/main';
+
+    $line-height: 2px;
+    $height: 90px;
+    $slider-size: 40px;
+
+    .container {
+      width: 100%;
+      max-width: 800px;
+      height: $height;
+      position: relative;
+      margin: calc(#{$slider-size} / 2) auto 0 auto;
+
+      @media (max-width: $mobile-width) {
+        max-width: 90vw;
+        margin-top: calc(#{$slider-size} / 2);
+      }
+
+      label { display: none; }
+
+      input[type='range'] {
+        width: 100%;
+        position: absolute;
+        left: 0;
+        -webkit-appearance: none;
+        appearance: none;
+        outline: none;
+        background: transparent;
+
+        &::-webkit-slider-thumb {
+          -webkit-appearance: none;
+          appearance: none;
+          height: $slider-size;
+          width: $slider-size;
+          border-radius: 1000px;
+          background-color: $light-color;
+          box-shadow: $shadow-border;
+          transform-origin: center center;
+          transform: translateY(calc(-1 * #{$slider-size} / 2 + #{$line-height} / 2));
+          transition: box-shadow $long-animation-time, transform $long-animation-time;
+          @media (min-width: $mobile-width) {
+            &:hover {
+              box-shadow: $shadow;
+              transform: translateY(calc(-1 * #{$slider-size} / 2 + #{$line-height} / 2))
+                scale(1.1);
+            }
+          }
+          cursor: pointer;
+          position: relative;
+          z-index: 2;
+        }
+
+        &::-moz-range-thumb {
+          -moz-appearance: none;
+          appearance: none;
+          height: $slider-size;
+          width: $slider-size;
+          border-radius: 1000px;
+          background-color: $light-color;
+          border: none;
+          box-shadow: $shadow-border;
+          cursor: pointer;
+        }
+
+        &::-webkit-slider-runnable-track {
+          -webkit-appearance: none;
+          width: 100%;
+          height: $line-height;
+          background-color: $text-color;
+          border-radius: 1000px;
+        }
+
+        &::-moz-range-track {
+          -moz-appearance: none;
+          width: 100%;
+          height: $line-height;
+          background-color: $text-color;
+          border-radius: 1000px;
+        }
+
+        &::-moz-focus-outer { border: 0; }
+      }
+
+      .value-container {
+        font-family: $normal-font;
+        color: $text-color;
+        font-size: var(--medium-font-size);
+        display: flex;
+        justify-content: space-evenly;
+        margin-top: calc(#{$slider-size} + 8px);
+
+        span {
+          display: block;
+          margin-top: 14px;
+          transform-origin: center bottom;
+          transition: transform $long-animation-time;
+          white-space: nowrap;
+        }
+
+        @media (max-width: $mobile-width) {
+          font-size: var(--small-font-size);
+          margin-top: $slider-size;
+          span { margin-top: 10px; }
+        }
+      }
+    }
+  `,
+})
+export class DoubleSliderComponent {
+  /** Ordered list of underlying values (e.g. dates). */
+  readonly values = input.required<unknown[]>();
+  /** Display labels for evenly-spaced ticks (≤ values.length). */
+  readonly labels = input.required<string[]>();
+
+  readonly rangeChange = output<DoubleSliderRange<unknown>>();
+
+  readonly oneValue = signal(0);
+  readonly otherValue = signal(0);
+  readonly maxIndex = computed(() => Math.max(0, this.values().length - 1));
+
+  private prevValuesLength = 0;
+
+  readonly drawnLabels = computed(() => {
+    const labels = this.labels();
+    const count = Math.min(labels.length, 6);
+    if (count === 0) return [] as string[];
+    const jump = Math.max(1, Math.round(labels.length / count));
+    return labels.filter((_, i) => i % jump === 0);
+  });
+
+  readonly drawnIndices = computed(() =>
+    Array.from({ length: this.drawnLabels().length }, (_, i) => i),
+  );
+
+  constructor() {
+    // Re-emit the value range whenever the slider thumbs or values change.
+    effect(() => {
+      const a = this.oneValue();
+      const b = this.otherValue();
+      const vs = this.values();
+      if (vs.length === 0) return;
+      const lo = Math.min(a, b);
+      const hi = Math.max(a, b);
+      untracked(() => {
+        this.rangeChange.emit({
+          from: vs[this.clampIndex(lo)],
+          to: vs[this.clampIndex(hi)],
+        });
+      });
+    });
+
+    // Snap the higher thumb to the newest value when a new entry is appended.
+    effect(() => {
+      const len = this.values().length;
+      untracked(() => {
+        const max = Math.max(0, len - 1);
+        if (len > this.prevValuesLength) {
+          const a = this.oneValue();
+          const b = this.otherValue();
+          if (a > b) this.oneValue.set(max);
+          else this.otherValue.set(max);
+        } else {
+          if (this.oneValue() > max) this.oneValue.set(max);
+          if (this.otherValue() > max) this.otherValue.set(max);
+        }
+        this.prevValuesLength = len;
+      });
+    });
+  }
+
+  private clampIndex(value: number): number {
+    return Math.max(0, Math.min(this.values().length - 1, Math.round(value)));
+  }
+
+  /**
+   * Magnetic label position: returns a CSS `transform` that lifts the label
+   * upward and rotates -30° as a thumb approaches.
+   */
+  getOffset(index: number): string {
+    const labelIndex = index / Math.max(1, this.drawnLabels().length - 1);
+    const max = Math.max(1, this.maxIndex());
+    const a = this.oneValue() / max - 0.1;
+    const b = this.otherValue() / max - 0.1;
+    const dist = Math.min(Math.abs(labelIndex - a), Math.abs(labelIndex - b));
+    const ACTIVE_ZONE = 0.2;
+    const base = 'translateX(-50%) rotate(-30deg) translateY(100%)';
+    if (dist > ACTIVE_ZONE) return base;
+    const lift = ((ACTIVE_ZONE - dist) / ACTIVE_ZONE) * 36;
+    return `translateY(${lift}px) ${base}`;
+  }
+}

frontend/src/app/components/shared/icon/icon.component.ts

@@ -0,0 +1,29 @@
+import { Component, ChangeDetectionStrategy, input } from '@angular/core';
+
+export type IconName = 'arrow' | 'pen' | 'plus-sign' | 'trash' | 'x-sign';
+
+@Component({
+  selector: 'lt-icon',
+  standalone: true,
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    <img
+      [src]="'assets/' + name() + '.svg'"
+      [alt]="name()"
+      [style.width]="size()"
+      [style.height]="size()"
+      aria-hidden="true"
+    />
+  `,
+  styles: `
+    :host {
+      display: inline-flex;
+      align-items: center;
+      justify-content: center;
+    }
+  `,
+})
+export class IconComponent {
+  readonly name = input.required<IconName>();
+  readonly size = input<string>('1.25rem');
+}

frontend/src/app/components/shared/select-add/select-add.component.ts

@@ -0,0 +1,462 @@
+import {
+  Component,
+  ChangeDetectionStrategy,
+  input,
+  output,
+  signal,
+  ElementRef,
+  HostListener,
+  inject,
+} from '@angular/core';
+
+@Component({
+  selector: 'lt-select-add',
+  standalone: true,
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    <div
+      class="container"
+      [class.shadow-border]="onlyShadowBorder()"
+      [class.always-shadow]="alwaysDropShadow()"
+    >
+      <div class="background" [class.active]="open()"></div>
+      <div
+        class="top"
+        role="button"
+        tabindex="0"
+        [attr.aria-expanded]="open()"
+        (click)="toggleOpen($event)"
+        (keydown.enter)="toggleOpen($event)"
+        (keydown.space)="$event.preventDefault(); toggleOpen($event)"
+      >
+        <p>{{ resolvedSelected() ?? placeholder() }}</p>
+        <img class="arrow" [class.upside-down]="open()" src="assets/arrow.svg" alt="" />
+      </div>
+      <div class="bottom-container">
+        <div class="bottom" [class.open]="open()">
+          @for (item of resolvedItems(); track item) {
+            @if (editing()) {
+              <input
+                type="text"
+                [value]="item"
+                maxlength="200"
+                (blur)="onRename(item, $any($event.target).value)"
+              />
+            } @else {
+              <button class="option" type="button" (click)="onSelectItem(item)">
+                {{ item }}
+              </button>
+            }
+          }
+          <div class="add-row">
+            <input
+              type="text"
+              #addInput
+              placeholder="Add a value…"
+              maxlength="200"
+              (keydown.enter)="onAdd(addInput.value); addInput.value = ''"
+            />
+            <button
+              class="add-button"
+              type="button"
+              (click)="onAdd(addInput.value); addInput.value = ''"
+            >
+              Add
+            </button>
+            @if (editable()) {
+              <button
+                class="pen"
+                type="button"
+                [class.active]="editing()"
+                (click)="editing.update(v => !v)"
+              >
+                <img src="assets/pen.svg" alt="Edit" />
+              </button>
+            }
+          </div>
+        </div>
+      </div>
+    </div>
+  `,
+  styles: `
+    @import '../../../../library/main';
+
+    $inner-padding: var(--medium-padding);
+    $dropdown-shadow: 0 4px 14px rgba($text-color, 0.16), $shadow-border;
+
+    :host {
+      display: block;
+      width: 100%;
+    }
+
+    .container {
+      width: 100%;
+      position: relative;
+
+      .top,
+      .bottom {
+        padding: $inner-padding;
+        z-index: 4;
+      }
+
+      .top {
+        display: flex;
+        justify-content: space-between;
+        align-items: center;
+        position: relative;
+        cursor: pointer;
+        min-height: 46px;
+        box-sizing: border-box;
+        gap: var(--small-padding);
+
+        p {
+          display: block;
+          @include sub-title-text();
+          min-width: 0;
+          overflow: hidden;
+          text-overflow: ellipsis;
+          white-space: nowrap;
+          text-align: left;
+        }
+
+        img.arrow {
+          flex: 0 0 auto;
+          @include square(16px);
+          transition: transform $long-animation-time;
+
+          &.upside-down {
+            transform: rotate(-180deg);
+          }
+        }
+      }
+
+      .bottom-container {
+        width: 100%;
+        position: absolute;
+        top: 100%;
+        left: 0;
+        right: 0;
+        overflow: visible;
+        pointer-events: none;
+        z-index: 5;
+
+        .bottom {
+          position: relative;
+          width: 100%;
+          pointer-events: none;
+          box-sizing: border-box;
+          display: flex;
+          flex-direction: column;
+          align-items: flex-start;
+          border-radius: 0 0 var(--border-radius) var(--border-radius);
+          padding: $inner-padding;
+          padding-top: var(--small-padding);
+          gap: var(--small-padding);
+          // Default (closed) state — also the target of the close transition.
+          background-color: transparent;
+          box-shadow: none;
+          transform: translateY(-8px);
+          opacity: 0;
+          visibility: hidden;
+          // Clip the top edge so the panel's shadow can't bleed back up into
+          // the chip area; sides + bottom get a 10px slack for the shadow.
+          clip-path: inset(0 -10px -10px -10px);
+          // Delay the visibility change until after the slide animation finishes
+          // so the panel stays visible while it animates closed.
+          transition:
+            transform $long-animation-time,
+            opacity $long-animation-time,
+            background-color $long-animation-time,
+            box-shadow $long-animation-time,
+            visibility 0s $long-animation-time;
+
+          &.open {
+            visibility: visible;
+            pointer-events: all;
+            transform: none;
+            opacity: 1;
+            background-color: $light-color;
+            box-shadow: $dropdown-shadow;
+            // On open, visibility flips immediately (no delay); transform +
+            // colors + shadow animate over $long-animation-time.
+            transition:
+              transform $long-animation-time,
+              opacity $long-animation-time,
+              background-color $long-animation-time,
+              box-shadow $long-animation-time,
+              visibility 0s 0s;
+          }
+
+          .option {
+            @include sub-title-text();
+            display: flex;
+            align-items: center;
+            width: 100%;
+            min-height: 36px;
+            margin: 0;
+            padding: 0;
+            border: 0;
+            background: transparent;
+            text-align: left;
+            cursor: pointer;
+
+            &:after {
+              display: none;
+            }
+
+            @media (max-width: $mobile-width) {
+              min-height: 42px;
+            }
+          }
+
+          input[type='text'] {
+            @include sub-title-text();
+            width: 100%;
+            min-height: 36px;
+            box-sizing: border-box;
+            text-align: left;
+
+            &::placeholder {
+              color: rgba($text-color, 0.72);
+              opacity: 1;
+            }
+
+            @media (max-width: $mobile-width) {
+              min-height: 42px;
+            }
+          }
+
+          .add-row {
+            min-height: 40px;
+            position: relative;
+            width: 100%;
+            display: flex;
+            align-items: flex-end;
+            gap: var(--small-padding);
+
+            input[type='text'] {
+              flex: 1;
+              min-height: 0;
+              padding: 0;
+              border-bottom: solid 2px transparent;
+
+              &:focus,
+              &:focus-visible {
+                box-shadow: none;
+                border-bottom-color: $text-color;
+              }
+            }
+
+            button {
+              margin: 0;
+              position: relative;
+              flex: 0 0 auto;
+
+              &.add-button {
+                align-self: flex-end;
+              }
+
+              &.pen {
+                opacity: 0.25;
+                cursor: pointer;
+                display: flex;
+                align-items: center;
+                padding: 0;
+                border: none;
+                background: transparent;
+                position: relative;
+
+                // Kill the global button's hover-grow underline pseudo-element
+                // for the icon-only edit control.
+                &:after { content: none; display: none; }
+
+                img {
+                  @include square(16px);
+                }
+
+                &:before {
+                  content: '';
+                  display: block;
+                  position: absolute;
+                  bottom: -2px;
+                  left: 0;
+                  height: 2px;
+                  background-color: $text-color;
+                  width: 0;
+                  transition: width $long-animation-time;
+                }
+
+                @media (min-width: $mobile-width) {
+                  &:hover { opacity: 0.5; }
+                  &:hover:before { width: 100% !important; }
+                }
+
+                &.active {
+                  opacity: 1;
+                  &:before { width: 100% !important; }
+                }
+
+                transition: opacity $short-animation-time;
+              }
+            }
+          }
+        }
+      }
+
+      .background {
+        position: absolute;
+        top: 0;
+        height: 100%;
+        width: 100%;
+        @include card();
+        z-index: 3;
+        box-sizing: border-box;
+        transition:
+          box-shadow $long-animation-time,
+          height $long-animation-time,
+          border-radius $long-animation-time;
+
+        &.active {
+          // Same shadow recipe as the panel below so the two halves read as
+          // one continuous card. Clip the bottom edge so this shadow doesn't
+          // bleed across the seam where .top meets .bottom.
+          box-shadow: $dropdown-shadow;
+          clip-path: inset(-10px -10px 0 -10px);
+        }
+      }
+
+      .top {
+        transition: border-radius $long-animation-time;
+      }
+
+      // When the drawer is open, square the BOTTOM corners on both the
+      // background card and the top chip so they merge into one continuous
+      // surface. (Animated via the border-radius transitions above.)
+      &:has(.bottom.open) {
+        .top,
+        .background {
+          border-radius: var(--border-radius) var(--border-radius) 0 0;
+        }
+      }
+
+      // Hover lifts the chip — but only when the dropdown is closed. When
+      // it's open the chip is already showing $dropdown-shadow and a hover
+      // override would make the top heavier than the panel below.
+      &:hover {
+        @media (min-width: $mobile-width) {
+          .background:not(.active) { box-shadow: $shadow; }
+        }
+      }
+
+      &.shadow-border {
+        .background.active {
+          box-shadow: $shadow-border;
+          clip-path: inset(-10px -10px 0 -10px);
+        }
+        .bottom.open {
+          box-shadow: $shadow-border;
+        }
+      }
+
+      &.shadow-border:hover {
+        .background:not(.active) { box-shadow: $shadow-border; }
+      }
+
+      &.always-shadow {
+        .background:not(.active) { box-shadow: $shadow; }
+        // When open, clip the bottom so the always-on shadow doesn't bleed
+        // over the seam; restore full shadow when closed.
+        &:has(.bottom.open) .background {
+          clip-path: inset(-6px -6px 0 -6px);
+        }
+      }
+    }
+  `,
+})
+export class SelectAddComponent {
+  // ── New API (spec) ─────────────────────────────────────────────────────────
+  /** List of string options */
+  readonly items = input<string[]>([]);
+  /** Currently selected string value */
+  readonly selected = input<string | null>(null);
+  readonly editable = input<boolean>(false);
+  readonly placeholder = input<string>('Select…');
+  readonly alwaysDropShadow = input<boolean>(false);
+  readonly onlyShadowBorder = input<boolean>(false);
+
+  // ── Legacy compat API (used by pages.component.html until Agent B updates) ─
+  /** @deprecated Use items instead */
+  readonly options = input<string[]>([]);
+  /** @deprecated Use selected (string) instead */
+  readonly selectedIndex = input<number>(-1);
+
+  // ── Outputs — new API ──────────────────────────────────────────────────────
+  readonly select = output<string>();
+  readonly add = output<string>();
+  readonly rename = output<{ old: string; new: string }>();
+  readonly remove = output<string>();
+
+  // ── Legacy compat outputs ──────────────────────────────────────────────────
+  /** @deprecated Use select instead */
+  readonly selectionChange = output<number>();
+
+  // ── Internal state ─────────────────────────────────────────────────────────
+  readonly open = signal(false);
+  readonly editing = signal(false);
+  private readonly host = inject(ElementRef<HTMLElement>);
+
+  // Resolved values that merge old + new API
+  protected resolvedItems(): string[] {
+    const newItems = this.items();
+    const oldOptions = this.options();
+    return newItems.length ? newItems : oldOptions;
+  }
+
+  protected resolvedSelected(): string | null {
+    // New API: string
+    const s = this.selected();
+    if (s != null && s.trim()) return s;
+    // Legacy API: index into options
+    const idx = this.selectedIndex();
+    const opts = this.resolvedItems();
+    if (idx >= 0 && idx < opts.length) return opts[idx];
+    return null;
+  }
+
+  @HostListener('document:click', ['$event'])
+  onDocumentClick(event: MouseEvent): void {
+    if (!this.open()) return;
+    if (!this.host.nativeElement.contains(event.target as Node)) {
+      this.open.set(false);
+      this.editing.set(false);
+    }
+  }
+
+  toggleOpen(event: Event): void {
+    event.stopPropagation();
+    this.open.update((v) => !v);
+  }
+
+  onSelectItem(item: string): void {
+    this.select.emit(item);
+    // Legacy compat: also emit the index
+    const idx = this.resolvedItems().indexOf(item);
+    if (idx >= 0) this.selectionChange.emit(idx);
+    this.open.set(false);
+    this.editing.set(false);
+  }
+
+  onAdd(value: string): void {
+    const v = value.trim();
+    if (!v) return;
+    this.add.emit(v);
+    this.open.set(false);
+  }
+
+  onRename(oldValue: string, newValue: string): void {
+    const n = newValue.trim();
+    if (n && n !== oldValue) {
+      this.rename.emit({ old: oldValue, new: n });
+    }
+  }
+}

frontend/src/app/components/shared/toggle/toggle.component.ts

@@ -0,0 +1,133 @@
+import {
+  Component,
+  ChangeDetectionStrategy,
+  input,
+  model,
+} from '@angular/core';
+
+@Component({
+  selector: 'lt-toggle',
+  standalone: true,
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    <div class="toggle">
+      <span
+        role="button"
+        tabindex="0"
+        [class.active]="!checked()"
+        (click)="set(false)"
+        (keydown.enter)="set(false)"
+        (keydown.space)="$event.preventDefault(); set(false)"
+      >{{ offLabel() }}</span>
+      <label>
+        <input
+          type="checkbox"
+          [class.on]="checked()"
+          [checked]="checked()"
+          (change)="set(!checked())"
+        />
+      </label>
+      <span
+        role="button"
+        tabindex="0"
+        [class.active]="checked()"
+        (click)="set(true)"
+        (keydown.enter)="set(true)"
+        (keydown.space)="$event.preventDefault(); set(true)"
+      >{{ onLabel() }}</span>
+    </div>
+  `,
+  styles: `
+    @import '../../../../library/main';
+
+    :host {
+      $size: 30px;
+
+      @include center-child();
+      gap: var(--medium-padding);
+
+      @media (max-width: $mobile-width) {
+        width: 100%;
+        gap: var(--small-padding);
+      }
+
+      .toggle {
+        display: contents;
+      }
+
+      span {
+        @include medium-text();
+        // Fixed width (not max-width) so multiple toggles align column-wise
+        // — the thumb position is identical across rows regardless of label.
+        flex: 0 0 auto;
+        width: var(--toggle-label-width, #{4 * $size});
+        box-sizing: border-box;
+        padding: 0 var(--small-padding);
+        line-height: 1.3;
+        cursor: pointer;
+
+        &.active { font-weight: bold; }
+        &:first-of-type { text-align: right; }
+        &:last-of-type  { text-align: left; }
+
+        @media (max-width: $mobile-width) {
+          flex: 1 1 0;
+          width: auto;
+          min-width: 0;
+          padding: 0;
+          overflow-wrap: anywhere;
+        }
+      }
+
+      label {
+        display: block;
+        flex: 0 0 auto;
+
+        input[type='checkbox'] {
+          -webkit-appearance: none;
+          -moz-appearance: none;
+          width: 2 * $size;
+          height: $size;
+          border-radius: 1000px;
+          box-shadow: $shadow-border;
+          position: relative;
+          cursor: pointer;
+
+          &:after {
+            content: '';
+            position: absolute;
+            display: block;
+            left: 0;
+            @include square($size);
+            border-radius: 1000px;
+            background-color: $text-color;
+            transition: box-shadow $long-animation-time, left $long-animation-time, transform $long-animation-time;
+          }
+
+          &.on:after { left: $size; }
+        }
+
+        input[type='checkbox'] {
+          @media (min-width: $mobile-width) {
+            &:hover:after {
+              box-shadow: $shadow;
+              transform: translateX(2px);
+            }
+            &.on:hover:after {
+              transform: translateX(-2px);
+            }
+          }
+        }
+      }
+    }
+  `,
+})
+export class ToggleComponent {
+  readonly checked = model<boolean>(false);
+  readonly offLabel = input<string>('No');
+  readonly onLabel = input<string>('Yes');
+
+  set(value: boolean): void {
+    this.checked.set(value);
+  }
+}

frontend/src/app/components/tasks/tasks.component.ts

@@ -0,0 +1,279 @@
+import {
+  Component,
+  ChangeDetectionStrategy,
+  computed,
+  effect,
+  input,
+  output,
+  signal,
+  untracked,
+} from '@angular/core';
+import { Block, HslColor } from '../../models';
+import { getColorOfTag } from '../../utils/color';
+
+export function shouldExpandTasks(keepTasksOpen: boolean, manuallyExpanded: boolean): boolean {
+  return keepTasksOpen || manuallyExpanded;
+}
+
+export function taskListMaxHeight(expanded: boolean): string {
+  return expanded ? 'none' : '0px';
+}
+
+/**
+ * Tasks accordion — shows pending (not-done) blocks inside a tower.
+ * Sits ABOVE the falling-blocks area. Clicking the header expands/collapses
+ * unless the page setting is keeping tasks open.
+ * Clicking the colored tickbox marks the task done.
+ * Clicking the description opens the block-edit modal via the `edit` output.
+ */
+@Component({
+  selector: 'lt-tasks',
+  standalone: true,
+  imports: [],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    <div
+      class="container"
+      [class.show-hover]="pending().length > 0"
+      (pointerdown)="$event.stopPropagation()"
+      (mousedown)="$event.stopPropagation()"
+      (touchstart)="$event.stopPropagation()"
+    >
+      @if (!initiallyOpen()) {
+        <button
+          type="button"
+          class="header"
+          (click)="toggleExpanded($event)"
+          [attr.aria-expanded]="expanded()"
+        >
+          <strong>{{ pending().length === 0 ? '' : pending().length }}</strong>
+          @if (pending().length === 0) {
+            <span aria-hidden="true">&nbsp;</span>
+          } @else {
+            {{ pending().length === 1 ? 'task' : 'tasks' }}
+          }
+        </button>
+      }
+      <div
+        #all
+        class="all-task"
+        [style.max-height]="taskListMaxHeight(expanded())"
+      >
+        @for (b of pending(); track b.id) {
+          <div class="task-container">
+            <button
+              type="button"
+              class="tickbox"
+              [style.background-color]="colorOf(b.tag)"
+              (pointerup)="$event.stopPropagation()"
+              (touchend)="$event.stopPropagation()"
+              (click)="$event.stopPropagation(); markDone.emit(b)"
+              [attr.aria-label]="'Mark ' + (b.description || b.tag) + ' done'"
+            ></button>
+            <button
+              type="button"
+              class="task-description"
+              [style.color]="colorOf(b.tag)"
+              (click)="$event.stopPropagation(); edit.emit(b)"
+            >{{ b.description || b.tag }}</button>
+          </div>
+        }
+      </div>
+    </div>
+  `,
+  styles: `
+    @import '../../../library/main';
+
+    :host {
+      width: 100%;
+      box-sizing: border-box;
+      position: relative;
+      // Within the tower stacking context: high enough to float above the
+      // falling-blocks layer. Globally low enough that modals + the carousel
+      // (10000+) always cover us.
+      z-index: 5;
+
+      .container {
+        @include card();
+
+        cursor: pointer;
+        transition: box-shadow $long-animation-time;
+        &.show-hover:hover {
+          box-shadow: $shadow-border;
+        }
+
+        padding: calc(var(--small-padding) / 2);
+        margin: calc(var(--small-padding) / 2);
+
+        max-height: 30vh;
+        overflow-y: auto;
+
+        .header {
+          all: unset;
+          @include medium-text();
+          display: block;
+          width: 100%;
+          box-sizing: border-box;
+          cursor: pointer;
+          text-align: center;
+
+          &::after {
+            content: none;
+          }
+        }
+
+        .all-task {
+          @include inner-spacing(var(--small-padding));
+
+          :first-child { margin-top: var(--small-padding); }
+
+          box-sizing: border-box;
+          transition: max-height $long-animation-time;
+
+          /*
+           * Clip while collapsed only. When open, let the outer .container own
+           * scrolling via max-height: 30vh; a nested scroller here pops a
+           * scrollbar the instant a tickbox grows on hover.
+           */
+          overflow: hidden;
+
+          // Sideways breathing room so the clip doesn't shear the tickbox's
+          // hover shadow; negative side margins keep rows flush with the header,
+          // and the bottom padding clears the last row's shadow.
+          margin: 0 calc(var(--small-padding) / -2);
+          padding: 0 calc(var(--small-padding) / 2) calc(var(--small-padding) / 2);
+
+          .task-container {
+            display: flex;
+            align-items: center;
+            gap: var(--small-padding);
+
+            @media (max-width: $mobile-width) {
+              gap: calc(var(--small-padding) / 2);
+            }
+
+            &:hover .task-description {
+              @media (min-width: $mobile-width) {
+                color: inherit !important;
+              }
+            }
+
+            // Tickbox: a generously sized colored button that marks the task
+            // done without opening the edit carousel. Hover & focus reveal a
+            // subtle inner check mark.
+            .tickbox {
+              all: unset;                       // strip native button styles
+              flex: 0 0 24px;
+              cursor: pointer;
+              position: relative;
+              box-sizing: border-box;
+              @include square(24px);
+              min-width: 24px;
+              min-height: 24px;
+              @media (max-width: $mobile-width) {
+                @include square(24px);
+              }
+              border-radius: 4px;
+              box-shadow: $shadow-border;
+              transition: transform $short-animation-time, box-shadow $long-animation-time;
+
+              &::after {
+                content: '✓';
+                position: absolute;
+                inset: 0;
+                /*
+                 * Neutralise the global animated-underline bar from
+                 * forms.scss (button:after { height: 2px; width: 0->100% on
+                 * hover; background-color: $text-color }). The all:unset on the
+                 * button does NOT reach the pseudo-element, so without these
+                 * resets the bar paints a dark stripe across the top AND
+                 * squashes this box to 2px — which centres the glyph near the
+                 * top instead of the middle.
+                 */
+                width: 100%;
+                height: 100%;
+                background: none;
+                @include center-child();
+                color: $light-color;
+                font: bold 18px/1 $normal-font;   // re-assert font (all:unset dropped it to serif)
+                opacity: 0;                        // hidden at rest — only revealed on hover/focus/active
+                text-shadow: 0 0 1px rgba(0, 0, 0, 0.4);
+                // The ✓ glyph sits a touch high in its em-box; nudge to optical centre.
+                transform: translateY(1px);
+                transition: opacity $short-animation-time, transform $short-animation-time;
+              }
+
+              &:hover,
+              &:focus-visible {
+                box-shadow: $shadow;
+                transform: scale(1.05);
+                &::after { opacity: 0.85; }
+              }
+              &:active {
+                transform: scale(0.95);
+                &::after { opacity: 1; transform: translateY(1px) scale(1.05); }
+              }
+            }
+
+            .task-description {
+              all: unset;
+              @include medium-text();
+              white-space: nowrap;
+              text-overflow: ellipsis;
+              overflow-x: hidden;
+              text-align: left;
+              flex: 1 1 auto;
+              min-width: 0;
+              cursor: pointer;
+
+              @media (max-width: $mobile-width) {
+                font-size: var(--medium-font-size);
+                font-weight: 500;
+                filter: saturate(0.85) brightness(0.82);
+              }
+
+              position: relative;
+              &::after { content: none; }
+            }
+          }
+        }
+      }
+    }
+  `,
+})
+export class TasksComponent {
+  readonly pending = input.required<Block[]>();
+  readonly baseColor = input.required<HslColor>();
+  /** When true, the accordion starts expanded on first render. */
+  readonly initiallyOpen = input<boolean>(false);
+
+  /** Emitted when the colored tickbox is clicked — parent flips is_done to true. */
+  readonly markDone = output<Block>();
+  /** Emitted when the description is clicked — parent opens the block-edit modal. */
+  readonly edit = output<Block>();
+
+  private readonly manuallyExpanded = signal(false);
+  readonly expanded = computed(() =>
+    shouldExpandTasks(this.initiallyOpen(), this.manuallyExpanded()),
+  );
+  readonly taskListMaxHeight = taskListMaxHeight;
+
+  constructor() {
+    // When the page setting switches back to collapsed, discard any older manual
+    // open state so the setting is reflected immediately.
+    effect(() => {
+      const keepOpen = this.initiallyOpen();
+      if (!keepOpen) untracked(() => this.manuallyExpanded.set(false));
+    });
+  }
+
+  colorOf(tag: string): string {
+    return getColorOfTag(tag, this.baseColor());
+  }
+
+  toggleExpanded(event: Event): void {
+    event.stopPropagation();
+    if (this.initiallyOpen()) return;
+    this.manuallyExpanded.update((v) => !v);
+  }
+}

frontend/src/app/components/tasks/tasks.component.vitest.ts

@@ -0,0 +1,26 @@
+import { describe, expect, it } from 'vitest';
+import { shouldExpandTasks, taskListMaxHeight } from './tasks.component';
+
+describe('shouldExpandTasks', () => {
+  it('expands when tasks should be kept open by page setting', () => {
+    expect(shouldExpandTasks(true, false)).toBe(true);
+  });
+
+  it('expands when the user manually opens the accordion', () => {
+    expect(shouldExpandTasks(false, true)).toBe(true);
+  });
+
+  it('collapses when keep-open is disabled', () => {
+    expect(shouldExpandTasks(false, false)).toBe(false);
+  });
+});
+
+describe('taskListMaxHeight', () => {
+  it('does not cap open task lists by a measured height', () => {
+    expect(taskListMaxHeight(true)).toBe('none');
+  });
+
+  it('clips collapsed task lists', () => {
+    expect(taskListMaxHeight(false)).toBe('0px');
+  });
+});

frontend/src/app/components/tower/tower.component.ts

@@ -0,0 +1,929 @@
+import {
+  Component,
+  ChangeDetectionStrategy,
+  input,
+  output,
+  signal,
+  computed,
+  effect,
+  untracked,
+  AfterViewInit,
+  OnDestroy,
+  ElementRef,
+  viewChild,
+} from '@angular/core';
+import { Tower, Block } from '../../models';
+import { BlockComponent } from '../block/block.component';
+import { TasksComponent } from '../tasks/tasks.component';
+import { BlockEditComponent, BlockEditSave } from '../modal/block-edit.component';
+import { ModalComponent } from '../modal/modal.component';
+import { TowerSettingsComponent, TowerSettingsResult } from '../modal/tower-settings.component';
+import { toCss } from '../../utils/color';
+
+/** Tracks which entry path the block-edit modal was opened from. */
+export interface EditEntry {
+  filter: 'done' | 'pending';
+  activeId: string | null;
+}
+
+export function editEntryForNewBlock(keepTasksOpen: boolean): EditEntry {
+  return {
+    filter: keepTasksOpen ? 'pending' : 'done',
+    activeId: null,
+  };
+}
+
+/** A done block augmented with per-render animation state. */
+export interface StyledBlock extends Block {
+  _anim: '' | 'descend' | 'ascend';
+  _transform: string;
+  _opacity: string;
+}
+
+/** One rendered square. A block draws `difficulty` squares, all sharing the
+ *  block's color + animation state. */
+interface RenderSquare {
+  key: string;
+  block: StyledBlock;
+}
+
+const BLOCKS_PER_ROW = 6;
+
+/** How many squares a block draws (its difficulty, clamped to >= 1). */
+function squareCount(block: Block): number {
+  const n = Math.floor(block.difficulty ?? 1);
+  return Number.isFinite(n) && n > 0 ? n : 1;
+}
+
+function totalSquares(blocks: Block[]): number {
+  return blocks.reduce((sum, block) => sum + squareCount(block), 0);
+}
+
+/** Pick the newest blocks (array tail) whose cumulative square-count (each
+ *  block costs `difficulty` squares) fits within `limit`, preserving order. */
+function fitNewestBySquares(blocks: StyledBlock[], limit: number): StyledBlock[] {
+  const chosen: StyledBlock[] = [];
+  let used = 0;
+  for (let i = blocks.length - 1; i >= 0; i--) {
+    const cost = squareCount(blocks[i]);
+    if (used + cost > limit) break;
+    used += cost;
+    chosen.unshift(blocks[i]);
+  }
+  return chosen;
+}
+
+export function selectVisibleStyledBlocks(
+  styled: StyledBlock[],
+  visibleLimit: number,
+  enteringInRangeId: string | null,
+  prevVisibleIds: ReadonlySet<string> = new Set(),
+): { visibleStyled: StyledBlock[]; hiddenCount: number } {
+  // `visibleLimit` is a number of SQUARE slots. A block draws `difficulty`
+  // squares, so we cap by cumulative square cost, not by raw block count.
+  const normalizedLimit = Math.max(0, visibleLimit);
+  const restingBlocks = styled.filter((b) => b._opacity === '1');
+  let shownRestingBlocks = fitNewestBySquares(restingBlocks, normalizedLimit);
+  const enteringBlock =
+    enteringInRangeId === null ? undefined : restingBlocks.find((b) => b.id === enteringInRangeId);
+
+  if (enteringBlock && !shownRestingBlocks.some((b) => b.id === enteringBlock.id)) {
+    // Guarantee the just-completed block a slot, then fill the remaining
+    // square budget with the newest of the others.
+    const reservedBudget = Math.max(0, normalizedLimit - squareCount(enteringBlock));
+    const others = restingBlocks.filter((b) => b.id !== enteringBlock.id);
+    shownRestingBlocks = [enteringBlock, ...fitNewestBySquares(others, reservedBudget)];
+  }
+
+  const hiddenCount = Math.max(0, totalSquares(restingBlocks) - totalSquares(shownRestingBlocks));
+
+  // Blocks leaving past the upper date bound (opacity 0, `_anim: 'ascend'`) must
+  // stay in the render list so their fly-up transition actually plays — even
+  // when the resting stack already fills the whole square budget. Without this,
+  // a capped stack (e.g. the example page) destroys the element the instant the
+  // slider hides it and it just vanishes. Restrict to blocks that were visible a
+  // moment ago: ones already off-screen have nothing to animate from, so leaving
+  // them out keeps the rendered set (and the phantom flex slots) bounded.
+  const exitingBlocks = styled.filter((b) => b._opacity !== '1' && prevVisibleIds.has(b.id));
+
+  const shownIds = new Set([
+    ...shownRestingBlocks.map((b) => b.id),
+    ...exitingBlocks.map((b) => b.id),
+  ]);
+
+  return {
+    hiddenCount,
+    visibleStyled: styled.filter((b) => shownIds.has(b.id)),
+  };
+}
+
+@Component({
+  selector: 'lt-tower',
+  standalone: true,
+  imports: [BlockComponent, TasksComponent, ModalComponent, TowerSettingsComponent, BlockEditComponent],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    <div #towerRoot class="tower">
+      <div class="tower-header">
+        <input
+          #nameInput
+          type="text"
+          [value]="tower().name"
+          [style.color]="towerNameCss()"
+          (pointerdown)="$event.stopPropagation()"
+          (blur)="onRename($event)"
+          (keydown.enter)="nameInput.blur()"
+        />
+
+        <button
+          type="button"
+          class="edit-tower"
+          aria-label="Edit tower"
+          (click)="$event.stopPropagation(); showSettings.set(true)"
+        >
+          <img src="assets/pen.svg" alt="" />
+        </button>
+      </div>
+
+      <div
+        class="container"
+      >
+        <lt-tasks
+          [pending]="pending()"
+          [baseColor]="tower().base_color"
+          [initiallyOpen]="keepTasksOpen()"
+          (pointerdown)="$event.stopPropagation()"
+          (markDone)="onMarkTaskDone($event)"
+          (edit)="onEditBlock($event)"
+        />
+
+        <div
+          #stackZone
+          class="stack-zone"
+          [style.--block-stack-height]="blockStackHeight()"
+        >
+          <img
+            src="assets/plus-sign.svg"
+            class="add-block"
+            alt="Add block"
+            role="button"
+            tabindex="0"
+            (pointerdown)="$event.stopPropagation()"
+            (click)="$event.stopPropagation(); openAddBlock()"
+            (keydown.enter)="$event.stopPropagation(); openAddBlock()"
+            (keydown.space)="$event.preventDefault(); $event.stopPropagation(); openAddBlock()"
+          />
+
+          <div class="block-container-container">
+            <div class="block-container">
+              @for (sq of squares(); track sq.key; let i = $index) {
+                <lt-block
+                  [block]="sq.block"
+                  [baseColor]="tower().base_color"
+                  [hovered]="hoveredBlockId() === sq.block.id"
+                  [attr.data-block-id]="sq.block.id"
+                  [class.descend]="sq.block._anim === 'descend'"
+                  [class.ascend]="sq.block._anim === 'ascend'"
+                  [style.transform]="sq.block._transform"
+                  [style.opacity]="sq.block._opacity"
+                  [style.z-index]="squares().length - i"
+                  (pointerenter)="onBlockPointerEnter(sq.block.id)"
+                  (pointerleave)="onBlockPointerLeave(sq.block.id, $event)"
+                  (clicked)="onEditBlock(sq.block)"
+                />
+              }
+            </div>
+          </div>
+        </div>
+      </div>
+
+      @if (hiddenBlockCount() > 0) {
+        <p class="more-blocks">+ {{ hiddenBlockCount() }} more</p>
+      }
+    </div>
+
+    @if (editEntry(); as entry) {
+      <lt-modal (close)="closeEdit()">
+        <lt-block-edit
+          [viewTitle]="editViewTitle()"
+          [blocks]="filteredForEntry()"
+          [activeBlockId]="entry.activeId"
+          [tags]="towerTags()"
+          [baseColor]="tower().base_color"
+          [defaultDone]="entry.filter === 'done'"
+          (save)="onBlockSave($event)"
+          (delete)="onBlockDelete($event)"
+          (close)="closeEdit()"
+        />
+      </lt-modal>
+    }
+
+    @if (showSettings()) {
+      <lt-modal (close)="showSettings.set(false)">
+        <lt-tower-settings
+          [tower]="tower()"
+          (save)="onTowerSave($event)"
+          (delete)="onTowerDelete()"
+          (close)="showSettings.set(false)"
+        />
+      </lt-modal>
+    }
+  `,
+  styles: `
+    @import '../../../library/main';
+
+    :host {
+      display: block;
+      cursor: pointer;
+      min-height: 0;
+
+      &.cdk-drag-animating {
+        transition: transform 250ms cubic-bezier(0, 0, 0.2, 1);
+      }
+
+      &.cdk-drag-placeholder {
+        opacity: 0;
+      }
+
+      &:hover {
+        @media (min-width: $mobile-width) {
+          div.container {
+            box-shadow: $shadow;
+          }
+        }
+      }
+
+      &.cdk-drag-preview {
+        div.container {
+          @media (max-width: $mobile-width) {
+            @keyframes shadow {
+              from { box-shadow: none; }
+              to   { box-shadow: $shadow; }
+            }
+            animation: shadow $long-animation-time forwards;
+          }
+        }
+      }
+
+      &.trash-highlight {
+        .container {
+          transform: scale(0.75);
+          position: relative;
+
+          &::before {
+            opacity: 0.5 !important;
+          }
+        }
+
+        .tower-header {
+          display: none;
+        }
+      }
+
+      .tower {
+        display: flex;
+        flex-direction: column;
+        align-items: center;
+        position: relative;
+        max-width: 100%;
+        height: 100%;
+        min-height: 0;
+
+        @include inner-spacing(var(--small-padding));
+
+        .container {
+          display: flex;
+          flex-direction: column;
+          flex: 1 1 auto;
+          margin-bottom: 0;
+          min-height: 0;
+          position: relative;
+          box-sizing: border-box;
+          container-type: inline-size;
+          --block-stack-height: 0px;
+          --add-block-size: 48px;
+          --add-block-clearance: var(--medium-padding);
+          --add-block-center-offset: 0px;
+
+          @include card();
+          overflow: hidden;
+          transition: transform $short-animation-time, box-shadow $long-animation-time;
+
+          @include inner-spacing(var(--medium-padding));
+
+          @media (max-width: $mobile-width) {
+            @include inner-spacing(var(--small-padding));
+            padding: 0;
+            --add-block-size: 32px;
+            --add-block-clearance: var(--small-padding);
+          }
+
+          width: 100%;
+
+          &::before {
+            content: '';
+            pointer-events: none;
+            position: absolute;
+            z-index: 2;
+            left: 0;
+            top: 0;
+            width: 100%;
+            height: 100%;
+            background-color: red;
+            opacity: 0;
+            border-radius: var(--border-radius);
+            transition: opacity $short-animation-time;
+          }
+
+          lt-tasks {
+            flex: 0 1 auto;
+            min-height: 56px;
+            max-height: min(30vh, 45%);
+            overflow: auto;
+            display: block;
+            width: 100%;
+
+            @media (max-width: $mobile-width) {
+              min-height: 44px;
+              max-height: min(25vh, 45%);
+            }
+
+            .container {
+              max-height: 100%;
+              overflow-y: auto;
+            }
+          }
+
+          .stack-zone {
+            position: relative;
+            flex: 1 1 auto;
+            min-height: 0;
+            width: 100%;
+
+            img {
+              position: relative;
+              z-index: 2;
+              height: 48px;
+
+              @media (max-width: $mobile-width) {
+                height: 32px;
+              }
+
+              opacity: 0.33;
+              transition: opacity $long-animation-time;
+              cursor: pointer;
+
+              &:hover {
+                opacity: 1;
+              }
+            }
+
+            img.add-block {
+              position: absolute;
+              z-index: 3;
+              left: 50%;
+              top: max(
+                0px,
+                min(
+                  calc(50% - var(--add-block-size) / 2 - var(--add-block-center-offset)),
+                  calc(100% - var(--block-stack-height) - var(--add-block-clearance) - var(--add-block-size))
+                )
+              );
+              transform: translateX(-50%);
+            }
+
+            .block-container-container {
+              position: absolute;
+              inset: 0;
+
+              .block-container {
+                display: flex;
+                flex-flow: row wrap;
+                justify-content: flex-start;
+                align-content: flex-start;
+                align-items: flex-end;
+                position: absolute;
+                bottom: 0;
+                width: 100%;
+                transform: scaleY(-1);
+
+                /* Default resting position for all blocks before JS sets them */
+                * {
+                  transform: translateY(500%);
+                }
+
+                .descend {
+                  transition: transform 1.5s cubic-bezier(0.5, 0, 1, 0),
+                              opacity 500ms cubic-bezier(0.5, 0, 1, 0);
+                }
+
+                .ascend {
+                  transition: transform 1.5s cubic-bezier(0.5, 0, 1, 0),
+                              opacity 500ms cubic-bezier(0.5, 0, 1, 0) 1s;
+                }
+              }
+            }
+          }
+        }
+
+        .more-blocks {
+          @include small-text();
+          position: absolute;
+          top: calc(100% + var(--small-padding));
+          left: 0;
+          right: 0;
+          margin: 0;
+          line-height: 1;
+          color: rgba($text-color, 0.72);
+          text-align: center;
+          pointer-events: none;
+          user-select: none;
+        }
+
+        .tower-header {
+          position: relative;
+          display: flex;
+          align-items: center;
+          justify-content: center;
+          width: 100%;
+
+          input[type='text'] {
+            box-sizing: border-box;
+            min-width: 0;
+            font-size: var(--small-font-size);
+            text-align: center;
+
+            /* Truncate long titles with an ellipsis instead of wrapping. */
+            overflow: hidden;
+            text-overflow: ellipsis;
+            white-space: nowrap;
+
+            /* Reserve a symmetric gutter on each side. The right one keeps the
+               title and its focus underline clear of the absolutely-positioned
+               pen (so the underline stops before it); the equal left one keeps
+               the centered title optically centered. (pen 22px + 4px gap.) */
+            width: calc(100% - 52px);
+
+            @media (max-width: $mobile-width) {
+              width: calc(100% - 60px);
+            }
+          }
+
+          .edit-tower {
+            all: unset;
+            position: absolute;
+            right: 0;
+            top: 50%;
+            transform: translateY(-50%);
+            box-sizing: border-box;
+            width: 22px;
+            height: 22px;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            border-radius: var(--border-radius);
+            cursor: pointer;
+            opacity: 0.35;
+            transition: opacity $short-animation-time, box-shadow $long-animation-time, background-color $short-animation-time;
+
+            /* Suppress the global button's animated hover underline
+               (button::after), which the 'all: unset' reset doesn't reach. */
+            &:after {
+              content: none;
+            }
+
+            img {
+              width: 13px;
+              height: 13px;
+              opacity: 1;
+            }
+
+            &:hover,
+            &:focus-visible {
+              opacity: 1;
+              background-color: rgba($light-color, 0.86);
+              box-shadow: $shadow-border;
+            }
+
+            @media (max-width: $mobile-width) {
+              width: 26px;
+              height: 26px;
+              opacity: 0.55;
+            }
+          }
+        }
+      }
+    }
+  `,
+})
+export class TowerComponent implements AfterViewInit, OnDestroy {
+  // ── Inputs ─────────────────────────────────────────────────────────────────
+  readonly tower = input.required<Tower>();
+  /** Optional date range filter — when set, blocks with `created_at`
+   *  outside [from, to] are hidden from the falling stack. */
+  readonly dateRange = input<{ from: number; to: number } | null>(null);
+  /** When true, the tasks accordion starts expanded on load. */
+  readonly keepTasksOpen = input<boolean>(false);
+  /** When true, completed blocks descend on this tower's first measured render. */
+  readonly animateInitialStack = input<boolean>(false);
+
+  // ── Outputs ────────────────────────────────────────────────────────────────
+  readonly updateTower = output<TowerSettingsResult>();
+  readonly deleteTowerRequest = output<void>();
+  /** Emitted when a new block is created from the carousel's "Create now" card. */
+  readonly addBlock = output<{ tag: string; description: string; is_done: boolean; difficulty: number }>();
+  /** Emitted when an existing block is patched from the carousel. */
+  readonly saveBlock = output<{
+    blockId: string;
+    result: { tag: string; description: string; is_done: boolean; difficulty: number };
+  }>();
+  readonly deleteBlock = output<string>();
+
+  // ── UI state ───────────────────────────────────────────────────────────────
+  /** The single source of truth for "block-edit modal open" — encodes both
+   *  which list of blocks to show and which one to focus initially. */
+  readonly editEntry = signal<EditEntry | null>(null);
+  readonly showSettings = signal(false);
+  readonly hiddenBlockCount = signal(0);
+  readonly hoveredBlockId = signal<string | null>(null);
+
+  private readonly stackZone = viewChild<ElementRef<HTMLElement>>('stackZone');
+  private readonly towerRoot = viewChild<ElementRef<HTMLElement>>('towerRoot');
+  private readonly maxVisibleBlocks = signal<number | null>(null);
+  private resizeObserver: ResizeObserver | null = null;
+  private destroyed = false;
+  private readonly animationFrames = new Set<number>();
+
+  // ── Derived ────────────────────────────────────────────────────────────────
+  /** Pending (not-done) blocks — fed to the tasks accordion. */
+  readonly pending = computed(() => this.tower().blocks.filter((b) => !b.is_done));
+
+  /** CSS color string for the tower name input. */
+  readonly towerNameCss = computed(() => toCss(this.tower().base_color));
+
+  /** Filtered list passed to the block-edit carousel. */
+  readonly filteredForEntry = computed(() => {
+    const entry = this.editEntry();
+    if (!entry) return [];
+    const isDone = entry.filter === 'done';
+    return this.tower().blocks.filter((b) => b.is_done === isDone);
+  });
+
+  readonly editViewTitle = computed(() => {
+    const entry = this.editEntry();
+    if (!entry) return '';
+    const prefix = entry.filter === 'done' ? 'Completed tasks' : 'Tasks';
+    return `${prefix} of ${this.tower().name}`;
+  });
+
+  /** Unique tags from existing blocks of this tower. */
+  readonly towerTags = computed(() => {
+    const set = new Set<string>();
+    for (const b of this.tower().blocks) if (b.tag) set.add(b.tag);
+    return [...set];
+  });
+
+  // ── Falling animation ──────────────────────────────────────────────────────
+  // Same approach as the legacy: detect "exactly one done block was added"
+  // and snap that last block to translateY(500%)/opacity:0, then on next
+  // tick flip it back to translateY(0)/opacity:1 with .descend so the
+  // 1.5s gravity transition fires.
+
+  private readonly _visibleBlocks = signal<StyledBlock[]>([]);
+  readonly visibleBlocks = this._visibleBlocks.asReadonly();
+
+  /** Flat list of squares to render: each visible block expands into
+   *  `difficulty` adjacent squares that wrap (via the flex container) into
+   *  the row above. All squares of a block share its animation state. */
+  readonly squares = computed<RenderSquare[]>(() => {
+    const out: RenderSquare[] = [];
+    for (const b of this.visibleBlocks()) {
+      const n = squareCount(b);
+      for (let k = 0; k < n; k++) {
+        out.push({ key: `${b.id}#${k}`, block: b });
+      }
+    }
+    return out;
+  });
+
+  readonly blockStackHeight = computed(() => {
+    const rows = Math.ceil(this.squares().length / BLOCKS_PER_ROW);
+    const cqw = rows * (100 / BLOCKS_PER_ROW);
+    return rows === 0 ? '0px' : `${Number(cqw.toFixed(4))}cqw`;
+  });
+
+  private prevDoneIds: string[] = [];
+  private isFirstRun = true;
+
+  constructor() {
+    effect(() => {
+      const range = this.dateRange();
+      const maxVisibleBlocks = this.maxVisibleBlocks();
+      const animateInitialStack = this.animateInitialStack();
+      // Reconcile all done blocks, then cap the rendered stack to the rows
+      // that fit below the tasks and add button.
+      const allDone = this.tower().blocks.filter((b) => b.is_done);
+      untracked(() => this.reconcile(allDone, range, maxVisibleBlocks, animateInitialStack));
+    });
+  }
+
+  ngAfterViewInit(): void {
+    const stackZone = this.stackZone()?.nativeElement;
+    if (!stackZone) return;
+
+    this.measureBlockCapacity();
+
+    if (typeof ResizeObserver !== 'undefined') {
+      this.resizeObserver = new ResizeObserver(() => this.measureBlockCapacity());
+      this.resizeObserver.observe(stackZone);
+    }
+
+    if (typeof requestAnimationFrame === 'function') {
+      requestAnimationFrame(() => this.measureBlockCapacity());
+    }
+  }
+
+  ngOnDestroy(): void {
+    this.destroyed = true;
+    for (const id of this.animationFrames) cancelAnimationFrame(id);
+    this.animationFrames.clear();
+    this.resizeObserver?.disconnect();
+  }
+
+  private measureBlockCapacity(): void {
+    const stackZone = this.stackZone()?.nativeElement;
+    if (!stackZone) return;
+
+    const width = stackZone.clientWidth;
+    const height = stackZone.clientHeight;
+    if (width <= 0 || height <= 0) {
+      this.maxVisibleBlocks.set(0);
+      return;
+    }
+
+    const styles = getComputedStyle(stackZone);
+    const addBlockSize = this.parseCssPixels(styles.getPropertyValue('--add-block-size'), 48);
+    this.measureAddBlockCenterOffset(stackZone);
+    const fallbackClearance = addBlockSize <= 32 ? 7.5 : 15;
+    const clearance = this.parseCssPixels(
+      styles.getPropertyValue('--add-block-clearance'),
+      fallbackClearance,
+    );
+
+    const rowHeight = width / BLOCKS_PER_ROW;
+    const availableHeight = Math.max(0, height - addBlockSize - 2 * clearance);
+    const rows = Math.floor((availableHeight + 0.5) / rowHeight);
+    this.maxVisibleBlocks.set(Math.max(0, rows) * BLOCKS_PER_ROW);
+  }
+
+  private measureAddBlockCenterOffset(stackZone: HTMLElement): void {
+    const towerRoot = this.towerRoot()?.nativeElement;
+    if (!towerRoot) return;
+
+    const stackRect = stackZone.getBoundingClientRect();
+    const towerRect = towerRoot.getBoundingClientRect();
+    const stackCenter = stackRect.top + stackRect.height / 2;
+    const towerCenter = towerRect.top + towerRect.height / 2;
+    const offset = Math.max(0, stackCenter - towerCenter);
+    stackZone.style.setProperty('--add-block-center-offset', `${offset}px`);
+  }
+
+  private parseCssPixels(value: string, fallback: number): number {
+    const parsed = Number.parseFloat(value);
+    return Number.isFinite(parsed) ? parsed : fallback;
+  }
+
+  private reconcile(
+    allDone: Block[],
+    range: { from: number; to: number } | null,
+    maxVisibleBlocks: number | null,
+    animateInitialStack: boolean,
+  ): void {
+    if (this.isFirstRun && animateInitialStack && maxVisibleBlocks === null) {
+      this._visibleBlocks.set([]);
+      this.hiddenBlockCount.set(0);
+      this.prevDoneIds = allDone.map((b) => b.id);
+      this.isFirstRun = false;
+      return;
+    }
+
+    const ids = allDone.map((b) => b.id);
+    const prev = this.prevDoneIds;
+    const prevSet = new Set(prev);
+    const newIds = ids.filter((id) => !prevSet.has(id));
+    const grewByOne =
+      !this.isFirstRun &&
+      ids.length === prev.length + 1 &&
+      newIds.length === 1 &&
+      prev.every((id) => ids.includes(id)); // no IDs disappeared
+
+    const styled: StyledBlock[] = [];
+    for (const b of allDone) {
+      if (range && b.created_at < range.from) {
+        // Below min-thumb boundary → drop entirely (instant shuffle, no animation).
+        continue;
+      }
+      if (range && b.created_at > range.to) {
+        // Above max-thumb boundary → fly up off the tower with gravity animation.
+        styled.push({
+          ...b,
+          _anim: 'ascend',
+          _transform: 'translateY(500%)',
+          _opacity: '0',
+        });
+        continue;
+      }
+      // In range — descend into position (or appear instantly on first run).
+      styled.push({
+        ...b,
+        _anim: this.isFirstRun ? '' : 'descend',
+        _transform: 'translateY(0)',
+        _opacity: '1',
+      });
+    }
+
+    const newInRangeId = grewByOne ? newIds[0] : null;
+    // Captured before any `_visibleBlocks.set` below — lets the cap keep
+    // currently-shown blocks that are now flying out so their exit animates.
+    const prevVisibleIds = new Set(this._visibleBlocks().map((b) => b.id));
+    const visibleLimit =
+      maxVisibleBlocks === null ? Number.POSITIVE_INFINITY : Math.max(0, maxVisibleBlocks);
+    let visibleStyled = styled;
+    let hiddenCount = 0;
+    if (Number.isFinite(visibleLimit)) {
+      ({ visibleStyled, hiddenCount } = selectVisibleStyledBlocks(
+        styled,
+        visibleLimit,
+        newInRangeId,
+        prevVisibleIds,
+      ));
+    }
+    this.hiddenBlockCount.set(hiddenCount);
+
+    if (this.isFirstRun && animateInitialStack) {
+      const initialBlocks = visibleStyled.filter((b) => b._opacity === '1');
+      if (initialBlocks.length > 0) {
+        this.startDescendAnimation(visibleStyled, initialBlocks);
+        this.prevDoneIds = ids;
+        this.isFirstRun = false;
+        return;
+      }
+    }
+
+    if (grewByOne) {
+      const newId = newIds[0];
+      const newBlock = visibleStyled.find((b) => b.id === newId);
+      if (newBlock) {
+        // Snap newly-added in-range block to start position, then on the next
+        // paint flip it back to rest — that's what makes it visibly fall.
+        this.startDescendAnimation(visibleStyled, [newBlock]);
+        this.prevDoneIds = ids;
+        this.isFirstRun = false;
+        return;
+      }
+    }
+    // existing fall-through path (no growth, first run, or new block out of range):
+    this._visibleBlocks.set(visibleStyled);
+
+    this.prevDoneIds = ids;
+    this.isFirstRun = false;
+  }
+
+  private startDescendAnimation(visibleStyled: StyledBlock[], blocks: StyledBlock[]): void {
+    for (const block of blocks) {
+      block._anim = '';
+      block._transform = 'translateY(500%)';
+      block._opacity = '0';
+    }
+    this._visibleBlocks.set(visibleStyled);
+    this.requestFrame(() => {
+      this.requestFrame(() => {
+        if (this.destroyed) return;
+        this.finishDescendAnimation(blocks);
+      });
+    });
+  }
+
+  private requestFrame(callback: () => void): void {
+    if (typeof requestAnimationFrame !== 'function') {
+      callback();
+      return;
+    }
+    const id = requestAnimationFrame(() => {
+      this.animationFrames.delete(id);
+      if (!this.destroyed) callback();
+    });
+    this.animationFrames.add(id);
+  }
+
+  private finishDescendAnimation(blocks: StyledBlock[]): void {
+    for (const block of blocks) {
+      block._anim = 'descend';
+      block._transform = 'translateY(0)';
+      block._opacity = '1';
+    }
+    this._visibleBlocks.set([...this._visibleBlocks()]);
+  }
+
+  // ── Event handlers ─────────────────────────────────────────────────────────
+
+  onRename(event: Event): void {
+    const input = event.target as HTMLInputElement;
+    const newName = input.value.trim();
+    if (!newName) {
+      input.value = this.tower().name;
+      return;
+    }
+    if (newName !== this.tower().name) {
+      this.updateTower.emit({ name: newName, base_color: this.tower().base_color });
+    } else {
+      input.value = this.tower().name;
+    }
+  }
+
+  onEditBlock(block: Block): void {
+    this.hoveredBlockId.set(null);
+    this.editEntry.set({ filter: block.is_done ? 'done' : 'pending', activeId: block.id });
+  }
+
+  onBlockPointerEnter(blockId: string): void {
+    this.hoveredBlockId.set(blockId);
+  }
+
+  onBlockPointerLeave(blockId: string, event: PointerEvent): void {
+    if (this.relatedTargetBelongsToBlock(event.relatedTarget, blockId)) return;
+    if (this.hoveredBlockId() === blockId) this.hoveredBlockId.set(null);
+  }
+
+  private relatedTargetBelongsToBlock(target: EventTarget | null, blockId: string): boolean {
+    const towerRoot = this.towerRoot()?.nativeElement;
+    let element = target instanceof Element ? target : null;
+
+    while (element && element !== towerRoot) {
+      if (element instanceof HTMLElement && element.dataset['blockId'] === blockId) return true;
+      element = element.parentElement;
+    }
+
+    return false;
+  }
+
+  /** Tickbox in the tasks accordion — flip is_done to true without opening the carousel. */
+  onMarkTaskDone(block: Block): void {
+    this.saveBlock.emit({
+      blockId: block.id,
+      result: {
+        tag: block.tag,
+        description: block.description,
+        is_done: true,
+        difficulty: block.difficulty,
+      },
+    });
+  }
+
+  /** Called by the template "Add block" plus-icon. */
+  openAddBlock(): void {
+    this.editEntry.set(editEntryForNewBlock(this.keepTasksOpen()));
+  }
+
+  closeEdit(): void {
+    this.editEntry.set(null);
+  }
+
+  onBlockSave(ev: BlockEditSave): void {
+    if (ev.id === null) {
+      this.addBlock.emit({
+        tag: ev.tag,
+        description: ev.description,
+        is_done: ev.is_done,
+        difficulty: ev.difficulty,
+      });
+    } else {
+      this.saveBlock.emit({
+        blockId: ev.id,
+        result: {
+          tag: ev.tag,
+          description: ev.description,
+          is_done: ev.is_done,
+          difficulty: ev.difficulty,
+        },
+      });
+    }
+  }
+
+  onBlockDelete(id: string): void {
+    // Don't close the carousel — the deleted block disappears from `blocks()`
+    // and the carousel re-renders in place. The user keeps editing siblings.
+    this.deleteBlock.emit(id);
+  }
+
+  onTowerSave(result: TowerSettingsResult): void {
+    // Tower edits auto-save, so this fires on every change and must NOT close
+    // the modal — the user closes it via the exit button / backdrop.
+    this.updateTower.emit(result);
+  }
+
+  onTowerDelete(): void {
+    this.showSettings.set(false);
+    this.deleteTowerRequest.emit();
+  }
+}

frontend/src/app/components/tower/tower.component.vitest.ts

@@ -0,0 +1,139 @@
+import { describe, expect, it } from 'vitest';
+import type { StyledBlock } from './tower.component';
+import { editEntryForNewBlock, selectVisibleStyledBlocks } from './tower.component';
+
+function block(id: string, opacity = '1', difficulty = 1): StyledBlock {
+  return {
+    id,
+    tag: 'tag',
+    description: id,
+    is_done: true,
+    difficulty,
+    created_at: 1,
+    _anim: '',
+    _transform: opacity === '1' ? 'translateY(0)' : 'translateY(500%)',
+    _opacity: opacity,
+  };
+}
+
+describe('selectVisibleStyledBlocks', () => {
+  it('reserves a capped visible slot for the newly completed block', () => {
+    const styled = [
+      block('newly-done'),
+      block('done-1'),
+      block('done-2'),
+      block('done-3'),
+      block('done-4'),
+      block('done-5'),
+      block('done-6'),
+      block('done-7'),
+    ];
+
+    const result = selectVisibleStyledBlocks(styled, 6, 'newly-done');
+
+    expect(result.hiddenCount).toBe(2);
+    expect(result.visibleStyled.map((b) => b.id)).toEqual([
+      'newly-done',
+      'done-3',
+      'done-4',
+      'done-5',
+      'done-6',
+      'done-7',
+    ]);
+  });
+
+  it('uses the normal capped window when no new block is entering', () => {
+    const styled = [
+      block('done-0'),
+      block('done-1'),
+      block('done-2'),
+      block('done-3'),
+      block('done-4'),
+      block('done-5'),
+      block('done-6'),
+      block('done-7'),
+    ];
+
+    const result = selectVisibleStyledBlocks(styled, 6, null);
+
+    expect(result.hiddenCount).toBe(2);
+    expect(result.visibleStyled.map((b) => b.id)).toEqual([
+      'done-2',
+      'done-3',
+      'done-4',
+      'done-5',
+      'done-6',
+      'done-7',
+    ]);
+  });
+
+  it('caps by square cost (difficulty), not by raw block count', () => {
+    // Each block draws 2 squares, so only 3 blocks fit in 6 square slots.
+    const hard = (id: string): StyledBlock => block(id, '1', 2);
+    const styled = [hard('a'), hard('b'), hard('c'), hard('d'), hard('e')];
+
+    const result = selectVisibleStyledBlocks(styled, 6, null);
+
+    expect(result.visibleStyled.map((b) => b.id)).toEqual(['c', 'd', 'e']);
+    expect(result.hiddenCount).toBe(4);
+  });
+
+  it('keeps a previously-visible block that is now flying out, even on a full stack', () => {
+    // Budget is full with three resting blocks; a fourth block has just left the
+    // range (opacity 0 → ascending). It was visible a moment ago, so it must stay
+    // rendered so its fly-up transition can play instead of vanishing instantly.
+    const styled = [
+      block('old-1'),
+      block('old-2'),
+      block('old-3'),
+      block('leaving', '0'),
+    ];
+    const prevVisible = new Set(['old-1', 'old-2', 'old-3', 'leaving']);
+
+    const result = selectVisibleStyledBlocks(styled, 3, null, prevVisible);
+
+    expect(result.visibleStyled.map((b) => b.id)).toContain('leaving');
+    expect(result.hiddenCount).toBe(0);
+  });
+
+  it('does not resurrect an off-screen block that leaves the range', () => {
+    // 'hidden-leaving' was never rendered (not in prevVisible) — nothing to
+    // animate from, so keep it out and avoid an unbounded phantom render set.
+    const styled = [
+      block('old-1'),
+      block('old-2'),
+      block('old-3'),
+      block('hidden-leaving', '0'),
+    ];
+    const prevVisible = new Set(['old-1', 'old-2', 'old-3']);
+
+    const result = selectVisibleStyledBlocks(styled, 3, null, prevVisible);
+
+    expect(result.visibleStyled.map((b) => b.id)).not.toContain('hidden-leaving');
+  });
+
+  it('counts hidden squares when reserving the entering block', () => {
+    const styled = [
+      block('newly-done', '1', 3),
+      block('done-1', '1', 2),
+      block('done-2', '1', 2),
+      block('done-3', '1', 2),
+      block('done-4', '1', 2),
+    ];
+
+    const result = selectVisibleStyledBlocks(styled, 6, 'newly-done');
+
+    expect(result.hiddenCount).toBe(6);
+    expect(result.visibleStyled.map((b) => b.id)).toEqual(['newly-done', 'done-4']);
+  });
+});
+
+describe('editEntryForNewBlock', () => {
+  it('opens the create card in the pending task view when tasks are kept open', () => {
+    expect(editEntryForNewBlock(true)).toEqual({ filter: 'pending', activeId: null });
+  });
+
+  it('keeps the existing completed-task default when tasks are collapsed', () => {
+    expect(editEntryForNewBlock(false)).toEqual({ filter: 'done', activeId: null });
+  });
+});

frontend/src/app/components/welcome/welcome.component.ts

@@ -0,0 +1,387 @@
+import { Component, ChangeDetectionStrategy, output } from '@angular/core';
+import { A11yModule } from '@angular/cdk/a11y';
+
+@Component({
+  selector: 'lt-welcome',
+  standalone: true,
+  imports: [A11yModule],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    <div class="welcome-card">
+      <h2 id="welcome-title" tabindex="-1" cdkFocusInitial>Welcome to Life Towers</h2>
+
+      <button
+        class="exit"
+        type="button"
+        (click)="close.emit()"
+        aria-label="Dismiss welcome"
+      ></button>
+
+      <p class="lead" id="welcome-description">
+        Life Towers turns completed tasks into visible stacks. Create pages for work, hobbies,
+        home, or any project. Add towers for task groups, then check off tasks to build them
+        block by block.
+      </p>
+
+      <p class="sr-only">
+        Preview showing three towers with pending task bars at the top and completed task
+        blocks stacked below.
+      </p>
+      <div class="tower-preview" aria-hidden="true">
+        <div class="preview-shell">
+          <div class="preview-page-tab"></div>
+          <div class="preview-towers">
+            <div class="preview-tower preview-tower--reading">
+              <span class="preview-task"></span>
+              <div class="preview-stack">
+                <span></span>
+                <span></span>
+                <span></span>
+                <span></span>
+                <span></span>
+                <span></span>
+              </div>
+            </div>
+            <div class="preview-tower preview-tower--projects">
+              <span class="preview-task"></span>
+              <span class="preview-task preview-task--short"></span>
+              <div class="preview-stack">
+                <span></span>
+                <span></span>
+                <span></span>
+                <span></span>
+                <span></span>
+                <span></span>
+                <span></span>
+                <span></span>
+                <span></span>
+              </div>
+            </div>
+            <div class="preview-tower preview-tower--exercise">
+              <span class="preview-task"></span>
+              <div class="preview-stack">
+                <span></span>
+                <span></span>
+                <span></span>
+                <span></span>
+                <span></span>
+                <span></span>
+                <span></span>
+              </div>
+            </div>
+          </div>
+        </div>
+      </div>
+
+      <h3 class="sr-only" id="welcome-basics-title">How Life Towers works</h3>
+      <dl class="basics" aria-labelledby="welcome-basics-title">
+        <div class="basic">
+          <dt class="basic__label">Pages</dt>
+          <dd class="basic__text">Keep each area separate.</dd>
+        </div>
+        <div class="basic">
+          <dt class="basic__label">Towers</dt>
+          <dd class="basic__text">Stack related tasks together.</dd>
+        </div>
+        <div class="basic">
+          <dt class="basic__label">Blocks</dt>
+          <dd class="basic__text">Finished tasks become colored blocks.</dd>
+        </div>
+      </dl>
+
+      <div class="actions">
+        <button type="button" (click)="startFresh.emit()">Start empty</button>
+        <button type="button" class="primary" (click)="loadExample.emit()">Load sample towers</button>
+      </div>
+    </div>
+  `,
+  styles: `
+    @import '../../../library/main';
+
+    :host { display: block; }
+
+    .sr-only {
+      position: absolute;
+      width: 1px;
+      height: 1px;
+      padding: 0;
+      margin: -1px;
+      overflow: hidden;
+      clip: rect(0 0 0 0);
+      clip-path: inset(50%);
+      white-space: nowrap;
+      border: 0;
+    }
+
+    .welcome-card {
+      @include card();
+      width: min(560px, calc(100vw - (2 * var(--large-padding))));
+      max-width: 560px;
+      max-height: calc(100svh - (2 * var(--medium-padding)));
+      overflow-y: auto;
+      @media (max-width: $mobile-width) {
+        width: min(88vw, calc(100vw - (2 * var(--medium-padding))));
+        max-width: 88vw;
+        padding: var(--medium-padding);
+      }
+      box-sizing: border-box;
+      padding: var(--large-padding);
+      position: relative;
+      box-shadow: $shadow;
+      text-align: left;
+      font-family: $normal-font;
+      font-weight: 300;
+      font-size: var(--medium-font-size);
+      line-height: 1.45;
+      @include inner-spacing(var(--medium-padding));
+
+      h2,
+      h3,
+      p,
+      dl,
+      dd {
+        margin: 0;
+      }
+
+      .exit {
+        position: absolute;
+        top: var(--medium-padding);
+        right: var(--medium-padding);
+        @include exit();
+      }
+
+      h2 {
+        font-family: $title-font;
+        font-weight: 400;
+        font-size: var(--larger-font-size);
+        text-align: center;
+        padding: 0 36px;
+        line-height: 1.25;
+
+        @media (max-width: $mobile-width) {
+          padding: 0 28px;
+        }
+      }
+
+      .lead {
+        color: $text-color;
+        font-family: inherit;
+        font-weight: inherit;
+        font-size: inherit;
+        line-height: inherit;
+        max-width: 46ch;
+        margin-inline: auto;
+        text-align: center;
+      }
+
+      .tower-preview {
+        box-sizing: border-box;
+        padding: var(--medium-padding) 0;
+        border-top: 1px solid rgba($text-color, 0.08);
+        border-bottom: 1px solid rgba($text-color, 0.08);
+
+        @media (max-width: $mobile-width) {
+          padding-block: var(--small-padding);
+        }
+      }
+
+      .preview-shell {
+        width: min(100%, 370px);
+        margin: 0 auto;
+      }
+
+      .preview-page-tab {
+        width: 96px;
+        height: 14px;
+        margin: 0 auto var(--small-padding);
+        border-radius: var(--border-radius);
+        background: rgba($text-color, 0.08);
+        box-shadow: $shadow-border;
+      }
+
+      .preview-towers {
+        display: grid;
+        grid-template-columns: repeat(3, minmax(0, 1fr));
+        align-items: end;
+        gap: var(--small-padding);
+      }
+
+      .preview-tower {
+        display: flex;
+        flex-direction: column;
+        min-height: 128px;
+        padding: 6px;
+        box-sizing: border-box;
+        border-radius: var(--border-radius);
+        background: rgba($text-color, 0.025);
+        box-shadow: $shadow-border;
+      }
+
+      .preview-task {
+        display: block;
+        width: 74%;
+        height: 5px;
+        margin-bottom: 4px;
+        border-radius: var(--border-radius);
+        background: var(--task-color);
+      }
+
+      .preview-task--short {
+        width: 48%;
+      }
+
+      .preview-stack {
+        display: flex;
+        flex-flow: row wrap-reverse;
+        align-content: flex-start;
+        gap: 2px;
+        min-height: 86px;
+        margin-top: auto;
+
+        span {
+          display: block;
+          flex: 0 0 calc((100% - 4px) / 3);
+          aspect-ratio: 1;
+          border-radius: 2px;
+          background: var(--block-color);
+          box-shadow: $shadow-border;
+        }
+
+        span:nth-child(2n) {
+          filter: saturate(0.9) brightness(1.06);
+        }
+
+        span:nth-child(3n) {
+          filter: saturate(1.08) brightness(0.96);
+        }
+      }
+
+      @media (prefers-reduced-motion: no-preference) {
+        @keyframes preview-task-pulse {
+          0%, 100% {
+            opacity: 0.42;
+            transform: scaleX(0.86);
+          }
+          45%, 70% {
+            opacity: 1;
+            transform: scaleX(1);
+          }
+        }
+
+        @keyframes preview-block-fall {
+          0% {
+            opacity: 0;
+            transform: translateY(-220%);
+          }
+          60%, 100% {
+            opacity: 1;
+            transform: translateY(0);
+          }
+        }
+
+        .preview-task {
+          transform-origin: left center;
+          animation: preview-task-pulse 2600ms ease-in-out infinite;
+        }
+
+        .preview-stack span {
+          opacity: 0;
+          animation: preview-block-fall 1200ms cubic-bezier(0.5, 0, 1, 0) forwards;
+          animation-delay: calc(160ms + var(--fall-index, 0) * 95ms);
+        }
+
+        .preview-stack span:nth-child(1) { --fall-index: 0; }
+        .preview-stack span:nth-child(2) { --fall-index: 1; }
+        .preview-stack span:nth-child(3) { --fall-index: 2; }
+        .preview-stack span:nth-child(4) { --fall-index: 3; }
+        .preview-stack span:nth-child(5) { --fall-index: 4; }
+        .preview-stack span:nth-child(6) { --fall-index: 5; }
+        .preview-stack span:nth-child(7) { --fall-index: 6; }
+        .preview-stack span:nth-child(8) { --fall-index: 7; }
+        .preview-stack span:nth-child(9) { --fall-index: 8; }
+      }
+
+      .preview-tower--reading {
+        --block-color: hsl(18, 70%, 58%);
+        --task-color: hsla(18, 70%, 58%, 0.26);
+      }
+
+      .preview-tower--projects {
+        --block-color: hsl(209, 65%, 52%);
+        --task-color: hsla(209, 65%, 52%, 0.24);
+      }
+
+      .preview-tower--exercise {
+        --block-color: hsl(130, 45%, 44%);
+        --task-color: hsla(130, 45%, 44%, 0.22);
+      }
+
+      .basics {
+        display: grid;
+        grid-template-columns: repeat(3, minmax(0, 1fr));
+        gap: var(--small-padding);
+
+        @media (max-width: $mobile-width) {
+          grid-template-columns: 1fr;
+        }
+      }
+
+      .basic {
+        display: flex;
+        flex-direction: column;
+        gap: 4px;
+        min-width: 0;
+      }
+
+      .basic__label,
+      .basic__text {
+        font-family: inherit;
+        font-weight: inherit;
+        font-size: inherit;
+        line-height: inherit;
+      }
+
+      .basic__label {
+        color: $text-color;
+      }
+
+      .basic__text {
+        color: rgba($text-color, 0.82);
+      }
+
+      .actions {
+        display: flex;
+        justify-content: space-around;
+        align-items: flex-end;
+        flex-wrap: wrap;
+        gap: var(--large-padding);
+        margin-top: var(--large-padding);
+
+        button {
+          font-family: inherit;
+          font-weight: inherit;
+          font-size: inherit;
+          margin: 0;
+          max-width: 100%;
+          line-height: inherit;
+          text-align: center;
+        }
+
+        button.primary {
+          color: $accent-color;
+          border-bottom-color: rgba($accent-color, 0.33);
+          &:after { background-color: $accent-color; }
+        }
+
+        @media (max-width: $mobile-width) {
+          gap: var(--small-padding);
+        }
+      }
+    }
+  `,
+})
+export class WelcomeComponent {
+  readonly close = output<void>();
+  readonly startFresh = output<void>();
+  readonly loadExample = output<void>();
+}

frontend/src/app/models/index.ts

@@ -0,0 +1,46 @@
+export interface HslColor {
+  h: number; // 0-1
+  s: number; // 0-1
+  l: number; // 0-1
+}
+
+export interface Block {
+  id: string;
+  tag: string;
+  description: string;
+  is_done: boolean;
+  /** How many squares this block draws in the tower (>= 1). */
+  difficulty: number;
+  created_at: number;
+}
+
+export interface Tower {
+  id: string;
+  name: string;
+  base_color: HslColor;
+  blocks: Block[];
+}
+
+export interface Page {
+  id: string;
+  name: string;
+  hide_create_tower_button: boolean;
+  keep_tasks_open: boolean;
+  default_date_from: number | null;
+  default_date_to: number | null;
+  towers: Tower[];
+}
+
+export interface TreeDto {
+  pages: Page[];
+}
+
+export type SaveStatus =
+  | 'idle'
+  | 'saving'
+  | 'saved'
+  | 'retrying'
+  | 'error' // generic / network — retries exhausted until the next mutation
+  | 'too-large' // 413 — payload exceeds the server cap, will not retry
+  | 'rate-limited' // 429 — will retry after Retry-After
+  | 'invalid'; // 400 — server rejected the body, will not retry

frontend/src/app/services/analytics.service.ts

@@ -0,0 +1,65 @@
+import { Injectable, isDevMode } from '@angular/core';
+import {
+  init as plausibleInit,
+  track as plausibleTrack,
+  type PlausibleEventOptions,
+} from '@plausible-analytics/tracker';
+
+const ANALYTICS_AUTO_CAPTURE_PAGEVIEWS = true;
+const ANALYTICS_DOMAIN = 'schmelczer.dev/towers';
+const ANALYTICS_ENDPOINT = 'https://stats.schmelczer.dev/status';
+
+@Injectable({ providedIn: 'root' })
+export class AnalyticsService {
+  private isInitialized = false;
+  private hasTrackedStart = false;
+
+  init(): void {
+    if (this.isInitialized) return;
+    try {
+      plausibleInit({
+        domain: ANALYTICS_DOMAIN,
+        endpoint: ANALYTICS_ENDPOINT,
+        autoCapturePageviews: ANALYTICS_AUTO_CAPTURE_PAGEVIEWS,
+        logging: isDevMode(),
+      });
+      this.isInitialized = true;
+    } catch (error) {
+      console.warn('Could not initialize analytics.', error);
+    }
+  }
+
+  private track(eventName: string, options: PlausibleEventOptions = {}): void {
+    try {
+      plausibleTrack(eventName, options);
+    } catch (error) {
+      console.warn(`Could not track analytics event "${eventName}".`, error);
+    }
+  }
+
+  trackStart(): void {
+    if (this.hasTrackedStart) return;
+    this.hasTrackedStart = true;
+    this.track('Start');
+  }
+
+  trackExampleLoaded(): void {
+    this.track('Example Loaded');
+  }
+
+  trackPageCreated(): void {
+    this.track('Page Created');
+  }
+
+  trackTowerCreated(): void {
+    this.track('Tower Created');
+  }
+
+  trackBlockCreated({ isDone }: { isDone: boolean }): void {
+    this.track('Block Created', { props: { isDone: String(isDone) } });
+  }
+
+  trackBlockCompleted(): void {
+    this.track('Block Completed');
+  }
+}

frontend/src/app/services/api.service.ts

@@ -0,0 +1,35 @@
+import { Injectable, inject } from '@angular/core';
+import { HttpClient, HttpHeaders } from '@angular/common/http';
+import { firstValueFrom } from 'rxjs';
+import { TreeDto } from '../models';
+
+@Injectable({ providedIn: 'root' })
+export class ApiService {
+  private readonly http = inject(HttpClient);
+
+  health(): Promise<{ status: string }> {
+    return firstValueFrom(this.http.get<{ status: string }>('/api/v1/health'));
+  }
+
+  register(token: string): Promise<{ user_id: string }> {
+    return firstValueFrom(
+      this.http.post<{ user_id: string }>('/api/v1/register', { token }),
+    );
+  }
+
+  getData(token: string): Promise<TreeDto> {
+    return firstValueFrom(
+      this.http.get<TreeDto>('/api/v1/data', { headers: this.authHeaders(token) }),
+    );
+  }
+
+  async putData(token: string, tree: TreeDto): Promise<void> {
+    await firstValueFrom(
+      this.http.put('/api/v1/data', tree, { headers: this.authHeaders(token) }),
+    );
+  }
+
+  private authHeaders(token: string): HttpHeaders {
+    return new HttpHeaders({ Authorization: `Bearer ${token}` });
+  }
+}

frontend/src/app/services/api.service.vitest.ts

@@ -0,0 +1,44 @@
+import { describe, it, expect, beforeEach, afterEach } from 'vitest';
+import { TestBed } from '@angular/core/testing';
+import { provideHttpClient } from '@angular/common/http';
+import { HttpTestingController, provideHttpClientTesting } from '@angular/common/http/testing';
+import { ApiService } from './api.service';
+import type { TreeDto } from '../models';
+
+describe('ApiService', () => {
+  let service: ApiService;
+  let http: HttpTestingController;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({
+      providers: [provideHttpClient(), provideHttpClientTesting(), ApiService],
+    });
+    service = TestBed.inject(ApiService);
+    http = TestBed.inject(HttpTestingController);
+  });
+
+  afterEach(() => {
+    http.verify();
+  });
+
+  it('gets data with a bearer token', async () => {
+    const tree: TreeDto = { pages: [] };
+    const promise = service.getData('token-1');
+    const req = http.expectOne('/api/v1/data');
+    expect(req.request.method).toBe('GET');
+    expect(req.request.headers.get('Authorization')).toBe('Bearer token-1');
+    req.flush(tree);
+    await expect(promise).resolves.toEqual(tree);
+  });
+
+  it('puts data with a bearer token', async () => {
+    const tree: TreeDto = { pages: [] };
+    const promise = service.putData('token-1', tree);
+    const req = http.expectOne('/api/v1/data');
+    expect(req.request.method).toBe('PUT');
+    expect(req.request.headers.get('Authorization')).toBe('Bearer token-1');
+    expect(req.request.body).toBe(tree);
+    req.flush(null);
+    await expect(promise).resolves.toBeUndefined();
+  });
+});

frontend/src/app/services/modal-state.service.ts

@@ -0,0 +1,25 @@
+import { Injectable, computed, signal } from '@angular/core';
+
+/**
+ * Shared counter of currently-open modals. Each `lt-modal` increments on
+ * mount and decrements on destroy. Consumers read `anyOpen` to react.
+ *
+ * Used by `page.component` to disable tower drag-and-drop while any modal
+ * (block-edit carousel, settings, tower-settings, confirm-delete,
+ * settings) is on screen — otherwise the user can drag towers from behind
+ * the open card.
+ */
+@Injectable({ providedIn: 'root' })
+export class ModalStateService {
+  private readonly _openCount = signal(0);
+
+  readonly anyOpen = computed(() => this._openCount() > 0);
+
+  open(): void {
+    this._openCount.update((n) => n + 1);
+  }
+
+  close(): void {
+    this._openCount.update((n) => Math.max(0, n - 1));
+  }
+}

frontend/src/app/services/store.service.ts

@@ -0,0 +1,770 @@
+import { Injectable, inject, signal, OnDestroy } from '@angular/core';
+import { ApiService } from './api.service';
+import { AnalyticsService } from './analytics.service';
+import { Page, Tower, Block, TreeDto, SaveStatus, HslColor } from '../models';
+
+const TOKEN_KEY = 'life-towers.token.v4';
+const CACHE_KEY_PREFIX = 'life-towers.cache.v4';
+const PENDING_CACHE_KEY_PREFIX = 'life-towers.cache-pending.v4';
+const DEBOUNCE_MS = 750;
+const MAX_RETRIES = 5;
+
+// RFC 4122 v4 UUID. Prefers crypto.randomUUID (secure contexts only) and
+// falls back to crypto.getRandomValues — which works on plain http origins
+// behind a non-localhost reverse proxy too.
+function uuidV4(): string {
+  if (typeof crypto !== 'undefined' && typeof crypto.randomUUID === 'function') {
+    try {
+      return crypto.randomUUID();
+    } catch {
+      /* fall through */
+    }
+  }
+  const b = new Uint8Array(16);
+  crypto.getRandomValues(b);
+  b[6] = (b[6] & 0x0f) | 0x40;
+  b[8] = (b[8] & 0x3f) | 0x80;
+  const h = Array.from(b, (x) => x.toString(16).padStart(2, '0')).join('');
+  return `${h.slice(0, 8)}-${h.slice(8, 12)}-${h.slice(12, 16)}-${h.slice(16, 20)}-${h.slice(20)}`;
+}
+
+function isUuidV4(value: string): boolean {
+  return /^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/.test(
+    value.toLowerCase(),
+  );
+}
+
+// localStorage can throw (private mode, quota exceeded, disabled). All
+// access goes through these helpers so a transient failure never bubbles
+// up and breaks app init.
+function safeGet(key: string): string | null {
+  try {
+    return localStorage.getItem(key);
+  } catch {
+    return null;
+  }
+}
+function safeSet(key: string, value: string): void {
+  try {
+    localStorage.setItem(key, value);
+  } catch {
+    /* ignore */
+  }
+}
+function safeRemove(key: string): void {
+  try {
+    localStorage.removeItem(key);
+  } catch {
+    /* ignore */
+  }
+}
+
+function cacheKeyForToken(token: string): string {
+  return `${CACHE_KEY_PREFIX}.${token}`;
+}
+
+function pendingCacheKeyForToken(token: string): string {
+  return `${PENDING_CACHE_KEY_PREFIX}.${token}`;
+}
+
+interface PendingPut {
+  token: string;
+  tree: TreeDto;
+  revision: number;
+}
+
+interface ExampleBlockSeed {
+  tag: string;
+  desc: string;
+  done: boolean;
+  difficulty?: number;
+  ageHrs: number;
+}
+
+interface ExampleDonePattern {
+  tag: string;
+  desc: (sequence: number) => string;
+}
+
+const EXAMPLE_DONE_BLOCKS_PER_TOWER = 12;
+
+@Injectable({ providedIn: 'root' })
+export class StoreService implements OnDestroy {
+  private readonly api = inject(ApiService);
+  private readonly analytics = inject(AnalyticsService);
+
+  // ── State ──────────────────────────────────────────────────────────────────
+  private readonly _pages = signal<Page[]>([]);
+  private readonly _saveStatus = signal<SaveStatus>('idle');
+  private readonly _token = signal<string>('');
+  private readonly _loading = signal<boolean>(true);
+
+  readonly pages = this._pages.asReadonly();
+  readonly saveStatus = this._saveStatus.asReadonly();
+  readonly loading = this._loading.asReadonly();
+  readonly token = this._token.asReadonly();
+
+  // ── Debounce / retry ───────────────────────────────────────────────────────
+  private debounceTimer: ReturnType<typeof setTimeout> | null = null;
+  private retryTimer: ReturnType<typeof setTimeout> | null = null;
+  private retryResolver: (() => void) | null = null;
+  private flushInFlight = false;
+  // True while in-flight if a new mutation arrived; we'll re-flush after.
+  private dirtyDuringFlush = false;
+  // Monotonic local mutation version. Prevents an older in-flight PUT from
+  // clearing a newer pending cache entry when it completes.
+  private localMutationRevision = 0;
+
+  // ── Cross-tab sync ─────────────────────────────────────────────────────────
+  private readonly storageListener = (e: StorageEvent) => {
+    if (e.key === TOKEN_KEY && e.newValue && e.newValue !== this._token()) {
+      this.switchToken(e.newValue);
+    } else if (e.key === cacheKeyForToken(this._token()) && e.newValue && !this.flushInFlight) {
+      // Another tab just wrote a fresh cache; adopt it if we're not mid-save
+      // (to avoid clobbering our own state with the other tab's older view).
+      try {
+        const tree: TreeDto = JSON.parse(e.newValue);
+        this._pages.set(tree.pages);
+      } catch {
+        /* ignore */
+      }
+    }
+  };
+
+  // ── Single-flight init ─────────────────────────────────────────────────────
+  private initPromise: Promise<void> | null = null;
+  private initGeneration = 0;
+
+  // ── Init ───────────────────────────────────────────────────────────────────
+  async init(): Promise<void> {
+    if (this.initPromise) return this.initPromise;
+    const generation = ++this.initGeneration;
+    this.initPromise = this.doInit(generation).finally(() => {
+      if (this.initGeneration === generation) {
+        this.initPromise = null;
+      }
+    });
+    return this.initPromise;
+  }
+
+  private async doInit(generation: number): Promise<void> {
+    if (typeof window !== 'undefined') {
+      // (idempotent — adding the same listener twice is a no-op)
+      window.addEventListener('storage', this.storageListener);
+    }
+
+    let stored = safeGet(TOKEN_KEY);
+    if (stored && !isUuidV4(stored)) {
+      // Garbage in localStorage from a buggy past version — refuse it.
+      stored = null;
+    } else if (stored) {
+      stored = stored.toLowerCase();
+      safeSet(TOKEN_KEY, stored);
+    }
+    const token = stored ?? uuidV4();
+    if (!stored) {
+      safeSet(TOKEN_KEY, token);
+    }
+    this._token.set(token);
+
+    if (!stored) {
+      try {
+        await this.api.register(token);
+      } catch {
+        // Non-fatal; the 401 path below will re-attempt registration.
+      }
+    }
+
+    try {
+      const tree = await this.api.getData(token);
+      if (this.isCurrentInit(generation, token)) this.adoptServerTree(tree, token);
+    } catch (err: unknown) {
+      const status = (err as { status?: number })?.status;
+      if (status === 401) {
+        // Token unknown to server — re-register (idempotent) and retry.
+        try {
+          await this.api.register(token);
+          const tree = await this.api.getData(token);
+          if (this.isCurrentInit(generation, token)) this.adoptServerTree(tree, token);
+        } catch {
+          if (this.isCurrentInit(generation, token)) this.loadFromCache(token);
+        }
+      } else {
+        if (this.isCurrentInit(generation, token)) this.loadFromCache(token);
+      }
+    } finally {
+      if (this.initGeneration === generation) {
+        this._loading.set(false);
+      }
+    }
+  }
+
+  private isCurrentInit(generation: number, token: string): boolean {
+    return this.initGeneration === generation && this._token() === token;
+  }
+
+  /**
+   * Apply a freshly-fetched server tree. If the server is empty but our local
+   * cache holds data, the cache wins and we schedule a push — otherwise the
+   * "server forgot me" recovery would silently wipe offline edits.
+   */
+  private adoptServerTree(tree: TreeDto, token: string): void {
+    if (safeGet(pendingCacheKeyForToken(token))) {
+      const cachedTree = this.readCachedTree(token);
+      if (cachedTree?.pages && cachedTree.pages.length > 0) {
+        this._pages.set(cachedTree.pages);
+        this.scheduleSave();
+        return;
+      }
+    }
+
+    if (tree.pages.length === 0) {
+      const cachedTree = this.readCachedTree(token);
+      if (cachedTree?.pages && cachedTree.pages.length > 0) {
+        this._pages.set(cachedTree.pages);
+        this.scheduleSave();
+        return;
+      }
+    }
+    this._pages.set(tree.pages);
+    this.updateCache(token, tree);
+  }
+
+  private loadFromCache(token: string): void {
+    const tree = this.readCachedTree(token);
+    if (tree) this._pages.set(tree.pages);
+  }
+
+  private readCachedTree(token: string): TreeDto | null {
+    const raw = safeGet(cacheKeyForToken(token));
+    if (!raw) return null;
+    try {
+      return JSON.parse(raw) as TreeDto;
+    } catch {
+      return null;
+    }
+  }
+
+  private updateCache(token: string, tree: TreeDto, pending = false): void {
+    safeSet(cacheKeyForToken(token), JSON.stringify(tree));
+    if (pending) {
+      safeSet(pendingCacheKeyForToken(token), '1');
+    } else {
+      safeRemove(pendingCacheKeyForToken(token));
+    }
+  }
+
+  private cancelPendingWrites(): void {
+    if (this.debounceTimer !== null) {
+      clearTimeout(this.debounceTimer);
+      this.debounceTimer = null;
+    }
+    if (this.retryTimer !== null) {
+      clearTimeout(this.retryTimer);
+      this.retryTimer = null;
+    }
+    if (this.retryResolver !== null) {
+      const resolve = this.retryResolver;
+      this.retryResolver = null;
+      resolve();
+    }
+    this.dirtyDuringFlush = false;
+  }
+
+  // ── Mutations ──────────────────────────────────────────────────────────────
+
+  addPage(name: string): void {
+    const page: Page = {
+      id: uuidV4(),
+      name,
+      hide_create_tower_button: false,
+      keep_tasks_open: false,
+      default_date_from: null,
+      default_date_to: null,
+      towers: [],
+    };
+    this._pages.update((pages) => [...pages, page]);
+    this.analytics.trackStart();
+    this.analytics.trackPageCreated();
+    this.scheduleSave();
+  }
+
+  updatePage(id: string, patch: Partial<Omit<Page, 'id' | 'towers'>>): void {
+    this._pages.update((pages) =>
+      pages.map((p) => (p.id === id ? { ...p, ...patch } : p)),
+    );
+    this.scheduleSave();
+  }
+
+  deletePage(id: string): void {
+    this._pages.update((pages) => pages.filter((p) => p.id !== id));
+    this.scheduleSave();
+  }
+
+  reorderPages(fromIndex: number, toIndex: number): void {
+    let changed = false;
+    this._pages.update((pages) => {
+      const reordered = reorder(pages, fromIndex, toIndex);
+      changed = reordered !== null;
+      return reordered ?? pages;
+    });
+    if (changed) this.scheduleSave();
+  }
+
+  addTower(pageId: string, name: string, base_color: HslColor): void {
+    const tower: Tower = { id: uuidV4(), name, base_color, blocks: [] };
+    this._pages.update((pages) =>
+      pages.map((p) => (p.id === pageId ? { ...p, towers: [...p.towers, tower] } : p)),
+    );
+    this.analytics.trackStart();
+    this.analytics.trackTowerCreated();
+    this.scheduleSave();
+  }
+
+  updateTower(pageId: string, towerId: string, patch: Partial<Omit<Tower, 'id' | 'blocks'>>): void {
+    this._pages.update((pages) =>
+      pages.map((p) =>
+        p.id === pageId
+          ? { ...p, towers: p.towers.map((t) => (t.id === towerId ? { ...t, ...patch } : t)) }
+          : p,
+      ),
+    );
+    this.scheduleSave();
+  }
+
+  deleteTower(pageId: string, towerId: string): void {
+    this._pages.update((pages) =>
+      pages.map((p) =>
+        p.id === pageId ? { ...p, towers: p.towers.filter((t) => t.id !== towerId) } : p,
+      ),
+    );
+    this.scheduleSave();
+  }
+
+  reorderTowers(pageId: string, fromIndex: number, toIndex: number): void {
+    let changed = false;
+    this._pages.update((pages) =>
+      pages.map((p) => {
+        if (p.id !== pageId) return p;
+        const towers = reorder(p.towers, fromIndex, toIndex);
+        if (towers === null) return p;
+        changed = true;
+        return { ...p, towers };
+      }),
+    );
+    if (changed) this.scheduleSave();
+  }
+
+  addBlock(
+    pageId: string,
+    towerId: string,
+    tag: string,
+    description: string,
+    is_done = false,
+    difficulty = 1,
+  ): void {
+    const block: Block = {
+      id: uuidV4(),
+      tag,
+      description,
+      is_done,
+      difficulty,
+      created_at: Math.floor(Date.now() / 1000),
+    };
+    this._pages.update((pages) =>
+      pages.map((p) =>
+        p.id === pageId
+          ? {
+            ...p,
+            towers: p.towers.map((t) =>
+              t.id === towerId ? { ...t, blocks: [...t.blocks, block] } : t,
+            ),
+          }
+          : p,
+      ),
+    );
+    this.analytics.trackStart();
+    this.analytics.trackBlockCreated({ isDone: is_done });
+    this.scheduleSave();
+  }
+
+  updateBlock(
+    pageId: string,
+    towerId: string,
+    blockId: string,
+    patch: Partial<Omit<Block, 'id' | 'created_at'>>,
+  ): void {
+    let becameDone = false;
+    this._pages.update((pages) =>
+      pages.map((p) =>
+        p.id === pageId
+          ? {
+            ...p,
+            towers: p.towers.map((t) =>
+              t.id === towerId
+                ? (() => {
+                  const result = this.patchBlockList(t.blocks, blockId, patch);
+                  becameDone = result.becameDone;
+                  return { ...t, blocks: result.blocks };
+                })()
+                : t,
+            ),
+          }
+          : p,
+      ),
+    );
+    if (becameDone) {
+      this.analytics.trackStart();
+      this.analytics.trackBlockCompleted();
+    }
+    this.scheduleSave();
+  }
+
+  deleteBlock(pageId: string, towerId: string, blockId: string): void {
+    this._pages.update((pages) =>
+      pages.map((p) =>
+        p.id === pageId
+          ? {
+            ...p,
+            towers: p.towers.map((t) =>
+              t.id === towerId
+                ? { ...t, blocks: t.blocks.filter((b) => b.id !== blockId) }
+                : t,
+            ),
+          }
+          : p,
+      ),
+    );
+    this.scheduleSave();
+  }
+
+  private patchBlockList(
+    blocks: Block[],
+    blockId: string,
+    patch: Partial<Omit<Block, 'id' | 'created_at'>>,
+  ): { blocks: Block[]; becameDone: boolean } {
+    const nextBlocks: Block[] = [];
+    let completedBlock: Block | null = null;
+    let becameDone = false;
+
+    for (const block of blocks) {
+      if (block.id !== blockId) {
+        nextBlocks.push(block);
+        continue;
+      }
+
+      const updated: Block = { ...block, ...patch };
+      becameDone = !block.is_done && updated.is_done;
+      if (becameDone) {
+        // Display newly completed todos as the newest square, without changing
+        // created_at because the date slider still filters on creation time.
+        completedBlock = updated;
+      } else {
+        nextBlocks.push(updated);
+      }
+    }
+
+    return {
+      blocks: completedBlock ? [...nextBlocks, completedBlock] : nextBlocks,
+      becameDone,
+    };
+  }
+
+  /**
+   * Switch to a different user's token. Any pending writes for the OLD
+   * account must be cancelled first — otherwise a queued PUT could fire
+   * against the NEW account with the old account's data (or vice versa,
+   * if the timing flipped).
+   */
+  switchToken(newToken: string): void {
+    const token = newToken.toLowerCase();
+    if (!isUuidV4(token)) return;
+    this.cancelPendingWrites();
+    this.initGeneration++;
+    this.initPromise = null;
+    safeSet(TOKEN_KEY, token);
+    this._token.set(token);
+    this._pages.set([]);
+    this._loading.set(true);
+    this._saveStatus.set('idle');
+    this.localMutationRevision = 0;
+    void this.init();
+  }
+
+  // ── Save / sync ────────────────────────────────────────────────────────────
+
+  private scheduleSave(): void {
+    this.localMutationRevision += 1;
+    const token = this._token();
+    if (token) this.updateCache(token, { pages: this._pages() }, true);
+
+    if (this.flushInFlight) {
+      // A save is already happening. Mark dirty so we re-flush when it finishes.
+      this.dirtyDuringFlush = true;
+      return;
+    }
+    if (this.debounceTimer !== null) clearTimeout(this.debounceTimer);
+    this.debounceTimer = setTimeout(() => {
+      this.debounceTimer = null;
+      void this.runFlush();
+    }, DEBOUNCE_MS);
+  }
+
+  /**
+   * One save attempt with bounded retries. Captures the token and tree
+   * snapshot up front so a mid-flight switchToken can't redirect this
+   * write to a different account.
+   */
+  private async runFlush(): Promise<void> {
+    if (this.flushInFlight) {
+      this.dirtyDuringFlush = true;
+      return;
+    }
+    const token = this._token();
+    if (!token) return;
+
+    this.flushInFlight = true;
+    this.dirtyDuringFlush = false;
+    const revision = this.localMutationRevision;
+
+    // Cancel any pending retry — runFlush() supersedes it.
+    if (this.retryTimer !== null) {
+      clearTimeout(this.retryTimer);
+      this.retryTimer = null;
+    }
+
+    try {
+      await this.attempt({ token, tree: { pages: this._pages() }, revision }, 0);
+    } finally {
+      this.flushInFlight = false;
+      // Coalesce mutations that arrived during the flush into a fresh save.
+      if (this.dirtyDuringFlush) {
+        this.dirtyDuringFlush = false;
+        this.scheduleSave();
+      }
+    }
+  }
+
+  private async attempt(put: PendingPut, attempt: number): Promise<void> {
+    this._saveStatus.set(attempt === 0 ? 'saving' : 'retrying');
+    try {
+      await this.api.putData(put.token, put.tree);
+      this._saveStatus.set('saved');
+      if (
+        this._token() === put.token &&
+        put.revision === this.localMutationRevision &&
+        !this.dirtyDuringFlush
+      ) {
+        this.updateCache(put.token, put.tree);
+      }
+      return;
+    } catch (err: unknown) {
+      const status = (err as { status?: number })?.status;
+      const headers = (err as { headers?: { get(name: string): string | null } })?.headers;
+
+      // Permanent failures: no point retrying.
+      if (status === 400) {
+        this._saveStatus.set('invalid');
+        return;
+      }
+      if (status === 413) {
+        this._saveStatus.set('too-large');
+        return;
+      }
+
+      // 401 mid-PUT: server forgot us. Re-register (idempotent) and retry.
+      if (status === 401) {
+        try {
+          await this.api.register(put.token);
+        } catch {
+          // fall through to retry/backoff
+        }
+      }
+
+      if (attempt >= MAX_RETRIES) {
+        this._saveStatus.set('error');
+        return;
+      }
+
+      // Honor server's Retry-After when present (429 in particular).
+      let delayMs = Math.min(1000 * 2 ** attempt, 30000);
+      if (status === 429) {
+        this._saveStatus.set('rate-limited');
+        const ra = headers?.get('Retry-After') ?? headers?.get('retry-after');
+        if (ra) {
+          const seconds = parseInt(ra, 10);
+          if (Number.isFinite(seconds) && seconds > 0) {
+            delayMs = Math.min(seconds * 1000, 60_000);
+          }
+        }
+      }
+
+      await new Promise<void>((resolve) => {
+        this.retryResolver = resolve;
+        this.retryTimer = setTimeout(() => {
+          this.retryTimer = null;
+          this.retryResolver = null;
+          resolve();
+        }, delayMs);
+      });
+
+      // The token may have changed during the wait — re-check before retrying.
+      if (this._token() !== put.token) return;
+      // Re-snapshot the latest pages so the retry pushes current state.
+      await this.attempt(
+        { token: put.token, tree: { pages: this._pages() }, revision: put.revision },
+        attempt + 1,
+      );
+    }
+  }
+
+  // ── Example data ──────────────────────────────────────────────────────────
+
+  loadExample(): string {
+    const now = Math.floor(Date.now() / 1000);
+
+    const page: Page = {
+      id: uuidV4(),
+      name: 'Hobbies',
+      hide_create_tower_button: false,
+      keep_tasks_open: true,
+      default_date_from: null,
+      default_date_to: null,
+      towers: [
+        // Done blocks are listed oldest-first so they fill the falling stack
+        // oldest → newest (left → right), matching the slider's old → new
+        // labels; pending tasks stay on top for the accordion.
+        this.makeExampleTower('Reading', { h: 0.05, s: 0.7, l: 0.55 }, now, [
+          {
+            tag: 'novel',
+            desc: 'Finish The Brothers Karamazov',
+            done: false,
+            difficulty: 4,
+            ageHrs: 0,
+          },
+          ...this.makeExampleDoneBlocks(
+            [
+              { tag: 'novel', desc: (n) => `Read chapter ${n}` },
+              { tag: 'paper', desc: (n) => `Annotated paper ${n}` },
+              { tag: 'article', desc: (n) => `Saved article notes ${n}` },
+              { tag: 'essay', desc: (n) => `Drafted reading response ${n}` },
+            ],
+            2,
+            8,
+          ),
+        ]),
+        this.makeExampleTower('Side projects', { h: 0.58, s: 0.65, l: 0.5 }, now, [
+          {
+            tag: 'angular',
+            desc: 'Modernise the towers app',
+            done: false,
+            difficulty: 3,
+            ageHrs: 0,
+          },
+          {
+            tag: 'rust',
+            desc: 'Port the sync layer to Tauri',
+            done: false,
+            difficulty: 5,
+            ageHrs: 1,
+          },
+          ...this.makeExampleDoneBlocks(
+            [
+              { tag: 'angular', desc: (n) => `Refined UI pass ${n}` },
+              { tag: 'rust', desc: (n) => `Completed systems spike ${n}` },
+              { tag: 'infra', desc: (n) => `Tuned deploy workflow ${n}` },
+              { tag: 'docs', desc: (n) => `Captured project note ${n}` },
+            ],
+            4,
+            9,
+          ),
+        ]),
+        this.makeExampleTower('Exercise', { h: 0.36, s: 0.6, l: 0.5 }, now, [
+          { tag: 'run', desc: '10k Sunday', done: false, difficulty: 2, ageHrs: 0 },
+          { tag: 'climb', desc: 'Lead 6a outdoors', done: false, difficulty: 4, ageHrs: 4 },
+          ...this.makeExampleDoneBlocks(
+            [
+              { tag: 'run', desc: (n) => `Easy run ${n}` },
+              { tag: 'climb', desc: (n) => `Bouldering session ${n}` },
+              { tag: 'mobility', desc: (n) => `Mobility circuit ${n}` },
+              { tag: 'strength', desc: (n) => `Strength session ${n}` },
+            ],
+            6,
+            11,
+          ),
+        ]),
+      ],
+    };
+
+    this._pages.update((pages) => [...pages, page]);
+    this.analytics.trackStart();
+    this.analytics.trackExampleLoaded();
+    this.scheduleSave();
+    return page.id;
+  }
+
+  private makeExampleTower(
+    name: string,
+    base_color: HslColor,
+    nowSec: number,
+    blocks: ExampleBlockSeed[],
+  ): Tower {
+    return {
+      id: uuidV4(),
+      name,
+      base_color,
+      blocks: blocks.map((b) => ({
+        id: uuidV4(),
+        tag: b.tag,
+        description: b.desc,
+        is_done: b.done,
+        difficulty: b.difficulty ?? 1,
+        created_at: nowSec - Math.floor(b.ageHrs * 3600),
+      })),
+    };
+  }
+
+  private makeExampleDoneBlocks(
+    patterns: ExampleDonePattern[],
+    newestAgeHrs: number,
+    spacingHrs: number,
+  ): ExampleBlockSeed[] {
+    return Array.from({ length: EXAMPLE_DONE_BLOCKS_PER_TOWER }, (_, i) => {
+      const pattern = patterns[i % patterns.length];
+      const sequence = Math.floor(i / patterns.length) + 1;
+      return {
+        tag: pattern.tag,
+        desc: pattern.desc(sequence),
+        done: true,
+        difficulty: 1 + ((i + (i % patterns.length) * 2) % 5),
+        ageHrs: newestAgeHrs + (EXAMPLE_DONE_BLOCKS_PER_TOWER - 1 - i) * spacingHrs,
+      };
+    });
+  }
+
+  ngOnDestroy(): void {
+    this.cancelPendingWrites();
+    if (typeof window !== 'undefined') {
+      window.removeEventListener('storage', this.storageListener);
+    }
+  }
+}
+
+function reorder<T>(items: readonly T[], fromIndex: number, toIndex: number): T[] | null {
+  if (
+    fromIndex === toIndex ||
+    !Number.isInteger(fromIndex) ||
+    !Number.isInteger(toIndex) ||
+    fromIndex < 0 ||
+    toIndex < 0 ||
+    fromIndex >= items.length ||
+    toIndex >= items.length
+  ) {
+    return null;
+  }
+
+  const next = [...items];
+  const [item] = next.splice(fromIndex, 1);
+  next.splice(toIndex, 0, item);
+  return next;
+}

frontend/src/app/services/store.service.vitest.ts

@@ -0,0 +1,676 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+import { TestBed } from '@angular/core/testing';
+import { provideZonelessChangeDetection } from '@angular/core';
+import { StoreService } from './store.service';
+import { ApiService } from './api.service';
+import { AnalyticsService } from './analytics.service';
+import type { TreeDto } from '../models';
+
+// ── localStorage stub ────────────────────────────────────────────────────────
+const storage: Record<string, string> = {};
+let storageThrowsOnSet = false;
+const localStorageStub = {
+  getItem: (k: string) => storage[k] ?? null,
+  setItem: (k: string, v: string) => {
+    if (storageThrowsOnSet) throw new Error('QuotaExceededError');
+    storage[k] = v;
+  },
+  removeItem: (k: string) => {
+    delete storage[k];
+  },
+  clear: () => Object.keys(storage).forEach((k) => delete storage[k]),
+  key: (i: number) => Object.keys(storage)[i] ?? null,
+  get length() {
+    return Object.keys(storage).length;
+  },
+};
+Object.defineProperty(globalThis, 'localStorage', {
+  value: localStorageStub,
+  configurable: true,
+  writable: true,
+});
+
+// ── crypto stub for tests that need deterministic UUIDs ─────────────────────
+const realCrypto = globalThis.crypto;
+function withFixedUuid<T>(uuid: string, fn: () => T): T {
+  const stub = {
+    randomUUID: () => uuid,
+    getRandomValues: realCrypto.getRandomValues.bind(realCrypto),
+  };
+  Object.defineProperty(globalThis, 'crypto', { value: stub, configurable: true });
+  try {
+    return fn();
+  } finally {
+    Object.defineProperty(globalThis, 'crypto', { value: realCrypto, configurable: true });
+  }
+}
+
+// ── Mock ApiService factory ──────────────────────────────────────────────────
+interface MockApi {
+  register: ReturnType<typeof vi.fn>;
+  getData: ReturnType<typeof vi.fn>;
+  putData: ReturnType<typeof vi.fn>;
+  health: ReturnType<typeof vi.fn>;
+}
+
+function makeMockApi(): MockApi {
+  return {
+    health: vi.fn().mockResolvedValue({ status: 'ok' }),
+    register: vi.fn().mockResolvedValue({ user_id: 'u' }),
+    getData: vi.fn().mockResolvedValue({ pages: [] } satisfies TreeDto),
+    putData: vi.fn().mockResolvedValue(undefined),
+  };
+}
+
+const FIXED_UUID = '11111111-2222-4333-8444-555555555555';
+const TOKEN_KEY = 'life-towers.token.v4';
+const CACHE_KEY = `life-towers.cache.v4.${FIXED_UUID}`;
+const PENDING_CACHE_KEY = `life-towers.cache-pending.v4.${FIXED_UUID}`;
+const OTHER_TOKEN = 'aaaabbbb-cccc-4ddd-8eee-ffffffffffff';
+const OTHER_CACHE_KEY = `life-towers.cache.v4.${OTHER_TOKEN}`;
+
+// ── Helpers ──────────────────────────────────────────────────────────────────
+function configure(api: MockApi): StoreService {
+  TestBed.resetTestingModule();
+  TestBed.configureTestingModule({
+    providers: [
+      provideZonelessChangeDetection(),
+      { provide: ApiService, useValue: api },
+      {
+        provide: AnalyticsService,
+        useValue: {
+          init: vi.fn(),
+          trackStart: vi.fn(),
+          trackExampleLoaded: vi.fn(),
+          trackPageCreated: vi.fn(),
+          trackTowerCreated: vi.fn(),
+          trackBlockCreated: vi.fn(),
+          trackBlockCompleted: vi.fn(),
+        },
+      },
+      StoreService,
+    ],
+  });
+  return TestBed.inject(StoreService);
+}
+
+function mkPage(name: string): TreeDto['pages'][number] {
+  return {
+    id: FIXED_UUID,
+    name,
+    hide_create_tower_button: false,
+    keep_tasks_open: false,
+    default_date_from: null,
+    default_date_to: null,
+    towers: [],
+  };
+}
+
+// HttpErrorResponse-compatible shape for rejected promises.
+function httpError(status: number, headers: Record<string, string> = {}) {
+  const headersObj = {
+    get: (n: string) =>
+      headers[n] ?? headers[n.toLowerCase()] ?? headers[n.toUpperCase()] ?? null,
+  };
+  const err: { status: number; headers: typeof headersObj } = { status, headers: headersObj };
+  return err;
+}
+
+describe('StoreService', () => {
+  beforeEach(() => {
+    localStorageStub.clear();
+    storageThrowsOnSet = false;
+    vi.useFakeTimers();
+  });
+  afterEach(() => {
+    vi.useRealTimers();
+  });
+
+  // ── Init ───────────────────────────────────────────────────────────────────
+
+  it('mints + persists a UUIDv4 token and calls register on first launch', async () => {
+    const api = makeMockApi();
+    const store = configure(api);
+
+    await withFixedUuid(FIXED_UUID, async () => {
+      await store.init();
+    });
+
+    expect(storage[TOKEN_KEY]).toBe(FIXED_UUID);
+    expect(api.register).toHaveBeenCalledWith(FIXED_UUID);
+    expect(api.getData).toHaveBeenCalledWith(FIXED_UUID);
+    expect(store.loading()).toBe(false);
+  });
+
+  it('reuses an existing stored token without re-registering', async () => {
+    storage[TOKEN_KEY] = FIXED_UUID;
+    const api = makeMockApi();
+    const store = configure(api);
+
+    await store.init();
+
+    expect(api.register).not.toHaveBeenCalled();
+    expect(store.token()).toBe(FIXED_UUID);
+  });
+
+  it('canonicalizes a stored uppercase token', async () => {
+    storage[TOKEN_KEY] = FIXED_UUID.toUpperCase();
+    const api = makeMockApi();
+    const store = configure(api);
+
+    await store.init();
+
+    expect(storage[TOKEN_KEY]).toBe(FIXED_UUID);
+    expect(api.getData).toHaveBeenCalledWith(FIXED_UUID);
+    expect(store.token()).toBe(FIXED_UUID);
+  });
+
+  it('rejects a non-UUIDv4 stored token and mints a fresh one', async () => {
+    storage[TOKEN_KEY] = 'not-a-uuid';
+    const api = makeMockApi();
+    const store = configure(api);
+
+    await withFixedUuid(FIXED_UUID, async () => {
+      await store.init();
+    });
+
+    expect(api.register).toHaveBeenCalledWith(FIXED_UUID);
+  });
+
+  it('on 401 from getData, re-registers the SAME token (idempotent) and retries', async () => {
+    storage[TOKEN_KEY] = FIXED_UUID;
+    const api = makeMockApi();
+    api.getData
+      .mockRejectedValueOnce(httpError(401))
+      .mockResolvedValueOnce({ pages: [mkPage('after-401')] });
+    const store = configure(api);
+
+    await store.init();
+
+    expect(api.register).toHaveBeenCalledTimes(1);
+    expect(api.register).toHaveBeenCalledWith(FIXED_UUID);
+    expect(api.getData).toHaveBeenCalledTimes(2);
+    expect(store.pages()).toHaveLength(1);
+    expect(store.pages()[0].name).toBe('after-401');
+  });
+
+  it('falls back to cache on non-401 network error', async () => {
+    storage[TOKEN_KEY] = FIXED_UUID;
+    storage[CACHE_KEY] = JSON.stringify({ pages: [mkPage('cached')] } satisfies TreeDto);
+    const api = makeMockApi();
+    api.getData.mockRejectedValue(httpError(0));
+    const store = configure(api);
+
+    await store.init();
+
+    expect(store.pages()).toHaveLength(1);
+    expect(store.pages()[0].name).toBe('cached');
+  });
+
+  it('keeps local cache when server returns empty but cache has data', async () => {
+    storage[TOKEN_KEY] = FIXED_UUID;
+    storage[CACHE_KEY] = JSON.stringify({ pages: [mkPage('offline-edit')] } satisfies TreeDto);
+    const api = makeMockApi();
+    api.getData.mockResolvedValue({ pages: [] });
+    const store = configure(api);
+
+    await store.init();
+
+    expect(store.pages()).toHaveLength(1);
+    expect(store.pages()[0].name).toBe('offline-edit');
+  });
+
+  it('init() doesn\'t crash if localStorage.setItem throws (private mode)', async () => {
+    storageThrowsOnSet = true;
+    const api = makeMockApi();
+    const store = configure(api);
+
+    await withFixedUuid(FIXED_UUID, async () => {
+      await expect(store.init()).resolves.toBeUndefined();
+    });
+    expect(store.loading()).toBe(false);
+  });
+
+  it('init() is single-flight — concurrent calls return the same promise', async () => {
+    storage[TOKEN_KEY] = FIXED_UUID;
+    const api = makeMockApi();
+    let resolveGet: ((v: TreeDto) => void) | null = null;
+    api.getData.mockReturnValue(new Promise<TreeDto>((res) => (resolveGet = res)));
+    const store = configure(api);
+
+    const p1 = store.init();
+    const p2 = store.init();
+    resolveGet!({ pages: [] });
+    await Promise.all([p1, p2]);
+
+    expect(api.getData).toHaveBeenCalledTimes(1);
+  });
+
+  it('moves a pending block to the end when it becomes done', async () => {
+    storage[TOKEN_KEY] = FIXED_UUID;
+    const api = makeMockApi();
+    api.getData.mockResolvedValue({
+      pages: [
+        {
+          id: 'page-1',
+          name: 'Page',
+          hide_create_tower_button: false,
+          keep_tasks_open: false,
+          default_date_from: null,
+          default_date_to: null,
+          towers: [
+            {
+              id: 'tower-1',
+              name: 'Tower',
+              base_color: { h: 0.5, s: 0.5, l: 0.5 },
+              blocks: [
+                {
+                  id: 'old-pending',
+                  tag: 'a',
+                  description: 'Created first, completed last',
+                  is_done: false,
+                  difficulty: 1,
+                  created_at: 100,
+                },
+                {
+                  id: 'newer-pending',
+                  tag: 'b',
+                  description: 'Still pending',
+                  is_done: false,
+                  difficulty: 1,
+                  created_at: 300,
+                },
+                {
+                  id: 'existing-done',
+                  tag: 'c',
+                  description: 'Already done',
+                  is_done: true,
+                  difficulty: 1,
+                  created_at: 200,
+                },
+              ],
+            },
+          ],
+        },
+      ],
+    } satisfies TreeDto);
+    const store = configure(api);
+    await store.init();
+
+    store.updateBlock('page-1', 'tower-1', 'old-pending', { is_done: true });
+
+    const blocks = store.pages()[0].towers[0].blocks;
+    expect(blocks.map((b) => b.id)).toEqual([
+      'newer-pending',
+      'existing-done',
+      'old-pending',
+    ]);
+    expect(blocks[2].created_at).toBe(100);
+  });
+
+  it('loads welcome example data with a stack of completed squares per tower', () => {
+    const api = makeMockApi();
+    const store = configure(api);
+
+    const pageId = store.loadExample();
+
+    const [page] = store.pages();
+    expect(page.id).toBe(pageId);
+    expect(page.name).toBe('Hobbies');
+    expect(page.towers).toHaveLength(3);
+
+    const doneBlocks = page.towers.flatMap((tower) => tower.blocks.filter((b) => b.is_done));
+    const doneSquares = doneBlocks.reduce((sum, block) => sum + block.difficulty, 0);
+    expect(doneSquares).toBeGreaterThanOrEqual(90);
+    expect(new Set(page.towers.flatMap((tower) => tower.blocks.map((b) => b.difficulty))).size)
+      .toBeGreaterThan(1);
+
+    for (const tower of page.towers) {
+      const doneDates = tower.blocks.filter((b) => b.is_done).map((b) => b.created_at);
+      const doneSquareCount = tower.blocks
+        .filter((b) => b.is_done)
+        .reduce((sum, block) => sum + block.difficulty, 0);
+      expect(doneSquareCount).toBeGreaterThanOrEqual(30);
+      expect(doneDates).toEqual([...doneDates].sort((a, b) => a - b));
+      expect(new Set(tower.blocks.map((b) => b.difficulty)).size).toBeGreaterThan(1);
+    }
+
+    store.ngOnDestroy();
+  });
+
+  // ── Debounced save ─────────────────────────────────────────────────────────
+
+  it('debounces saves: multiple mutations within 750ms → one PUT', async () => {
+    storage[TOKEN_KEY] = FIXED_UUID;
+    const api = makeMockApi();
+    const store = configure(api);
+    await store.init();
+
+    store.addPage('A');
+    store.addPage('B');
+    store.addPage('C');
+
+    expect(api.putData).not.toHaveBeenCalled();
+    await vi.advanceTimersByTimeAsync(750);
+    expect(api.putData).toHaveBeenCalledTimes(1);
+    expect(storage[PENDING_CACHE_KEY]).toBeUndefined();
+    const [, tree] = api.putData.mock.calls[0];
+    expect((tree as TreeDto).pages).toHaveLength(3);
+  });
+
+  it('mutation while a save is in-flight triggers a follow-up save', async () => {
+    storage[TOKEN_KEY] = FIXED_UUID;
+    const api = makeMockApi();
+    let resolveFirstPut: (() => void) | null = null;
+    api.putData
+      .mockReturnValueOnce(new Promise<void>((res) => (resolveFirstPut = () => res())))
+      .mockResolvedValueOnce(undefined);
+    const store = configure(api);
+    await store.init();
+
+    store.addPage('first');
+    await vi.advanceTimersByTimeAsync(750);
+    expect(api.putData).toHaveBeenCalledTimes(1);
+
+    // Mutate while first PUT is still hanging.
+    store.addPage('second');
+
+    // Finish the first save → follow-up should be scheduled.
+    resolveFirstPut!();
+    await vi.advanceTimersByTimeAsync(750);
+
+    expect(api.putData).toHaveBeenCalledTimes(2);
+    const lastTree = api.putData.mock.calls[1][1] as TreeDto;
+    expect(lastTree.pages).toHaveLength(2);
+  });
+
+  it('does not let an older in-flight save clear a newer pending cache entry', async () => {
+    storage[TOKEN_KEY] = FIXED_UUID;
+    const api = makeMockApi();
+    let resolveFirstPut: (() => void) | null = null;
+    api.putData
+      .mockReturnValueOnce(new Promise<void>((res) => (resolveFirstPut = () => res())))
+      .mockResolvedValueOnce(undefined);
+    const store = configure(api);
+    await store.init();
+
+    store.addPage('first');
+    await vi.advanceTimersByTimeAsync(750);
+    expect(api.putData).toHaveBeenCalledTimes(1);
+
+    store.addPage('second');
+    expect(JSON.parse(storage[CACHE_KEY]).pages.map((p: TreeDto['pages'][number]) => p.name))
+      .toEqual(['first', 'second']);
+    expect(storage[PENDING_CACHE_KEY]).toBe('1');
+
+    resolveFirstPut!();
+    await vi.advanceTimersByTimeAsync(0);
+
+    expect(JSON.parse(storage[CACHE_KEY]).pages.map((p: TreeDto['pages'][number]) => p.name))
+      .toEqual(['first', 'second']);
+    expect(storage[PENDING_CACHE_KEY]).toBe('1');
+
+    await vi.advanceTimersByTimeAsync(750);
+    expect(api.putData).toHaveBeenCalledTimes(2);
+    expect(storage[PENDING_CACHE_KEY]).toBeUndefined();
+  });
+
+  it('keeps a pending local mutation across reload before the debounce saves', async () => {
+    storage[TOKEN_KEY] = FIXED_UUID;
+    const api = makeMockApi();
+    const serverPage = mkPage('server');
+    api.getData.mockResolvedValue({ pages: [serverPage] });
+    const store = configure(api);
+    await store.init();
+
+    store.updatePage(FIXED_UUID, { keep_tasks_open: true });
+
+    expect(JSON.parse(storage[CACHE_KEY]).pages[0].keep_tasks_open).toBe(true);
+    expect(storage[PENDING_CACHE_KEY]).toBe('1');
+    store.ngOnDestroy();
+
+    const reloadedApi = makeMockApi();
+    reloadedApi.getData.mockResolvedValue({ pages: [serverPage] });
+    const reloadedStore = configure(reloadedApi);
+    await reloadedStore.init();
+
+    expect(reloadedStore.pages()[0].keep_tasks_open).toBe(true);
+
+    await vi.advanceTimersByTimeAsync(750);
+    expect(reloadedApi.putData).toHaveBeenCalledTimes(1);
+    const [, tree] = reloadedApi.putData.mock.calls[0];
+    expect((tree as TreeDto).pages[0].keep_tasks_open).toBe(true);
+  });
+
+  it('does not let a stale in-flight save clear a newer pending settings cache', async () => {
+    storage[TOKEN_KEY] = FIXED_UUID;
+    const api = makeMockApi();
+    const serverPage = mkPage('server');
+    let resolveFirstPut: (() => void) | null = null;
+    api.getData.mockResolvedValue({ pages: [serverPage] });
+    api.putData
+      .mockReturnValueOnce(new Promise<void>((res) => (resolveFirstPut = () => res())))
+      .mockResolvedValueOnce(undefined);
+    const store = configure(api);
+    await store.init();
+
+    store.updatePage(FIXED_UUID, { name: 'renamed' });
+    await vi.advanceTimersByTimeAsync(750);
+    expect(api.putData).toHaveBeenCalledTimes(1);
+    expect((api.putData.mock.calls[0][1] as TreeDto).pages[0].keep_tasks_open).toBe(false);
+
+    store.updatePage(FIXED_UUID, { keep_tasks_open: true });
+    expect(JSON.parse(storage[CACHE_KEY]).pages[0].keep_tasks_open).toBe(true);
+    expect(storage[PENDING_CACHE_KEY]).toBe('1');
+
+    resolveFirstPut!();
+    await vi.advanceTimersByTimeAsync(0);
+    expect(JSON.parse(storage[CACHE_KEY]).pages[0].keep_tasks_open).toBe(true);
+    expect(storage[PENDING_CACHE_KEY]).toBe('1');
+
+    await vi.advanceTimersByTimeAsync(750);
+    expect(api.putData).toHaveBeenCalledTimes(2);
+    expect((api.putData.mock.calls[1][1] as TreeDto).pages[0].keep_tasks_open).toBe(true);
+    expect(JSON.parse(storage[CACHE_KEY]).pages[0].keep_tasks_open).toBe(true);
+    expect(storage[PENDING_CACHE_KEY]).toBeUndefined();
+  });
+
+  // ── Error handling ────────────────────────────────────────────────────────
+
+  it('marks status "too-large" on 413 and does NOT retry', async () => {
+    storage[TOKEN_KEY] = FIXED_UUID;
+    const api = makeMockApi();
+    api.putData.mockRejectedValue(httpError(413));
+    const store = configure(api);
+    await store.init();
+
+    store.addPage('big');
+    await vi.advanceTimersByTimeAsync(750);
+    await vi.runAllTimersAsync();
+
+    expect(store.saveStatus()).toBe('too-large');
+    expect(api.putData).toHaveBeenCalledTimes(1);
+  });
+
+  it('marks status "invalid" on 400 and does NOT retry', async () => {
+    storage[TOKEN_KEY] = FIXED_UUID;
+    const api = makeMockApi();
+    api.putData.mockRejectedValue(httpError(400));
+    const store = configure(api);
+    await store.init();
+
+    store.addPage('bad');
+    await vi.advanceTimersByTimeAsync(750);
+    await vi.runAllTimersAsync();
+
+    expect(store.saveStatus()).toBe('invalid');
+    expect(api.putData).toHaveBeenCalledTimes(1);
+  });
+
+  it('honors Retry-After on 429 (uses it as the next delay)', async () => {
+    storage[TOKEN_KEY] = FIXED_UUID;
+    const api = makeMockApi();
+    api.putData
+      .mockRejectedValueOnce(httpError(429, { 'Retry-After': '2' }))
+      .mockResolvedValueOnce(undefined);
+    const store = configure(api);
+    await store.init();
+
+    store.addPage('x');
+    await vi.advanceTimersByTimeAsync(750);
+
+    // First attempt failed with 429 — we're now in the Retry-After window.
+    expect(store.saveStatus()).toBe('rate-limited');
+    expect(api.putData).toHaveBeenCalledTimes(1);
+
+    // Advance 1.9s → still waiting (Retry-After was 2s).
+    await vi.advanceTimersByTimeAsync(1900);
+    expect(api.putData).toHaveBeenCalledTimes(1);
+
+    // The full 2s → retry fires and succeeds.
+    await vi.advanceTimersByTimeAsync(100);
+    await vi.runAllTimersAsync();
+    expect(api.putData).toHaveBeenCalledTimes(2);
+    expect(store.saveStatus()).toBe('saved');
+  });
+
+  it('re-registers and retries on 401 mid-save', async () => {
+    storage[TOKEN_KEY] = FIXED_UUID;
+    const api = makeMockApi();
+    api.putData
+      .mockRejectedValueOnce(httpError(401))
+      .mockResolvedValueOnce(undefined);
+    const store = configure(api);
+    await store.init();
+
+    store.addPage('x');
+    await vi.advanceTimersByTimeAsync(750);
+    await vi.runAllTimersAsync();
+
+    expect(api.register).toHaveBeenCalledTimes(1);
+    expect(api.putData).toHaveBeenCalledTimes(2);
+    expect(store.saveStatus()).toBe('saved');
+  });
+
+  // ── switchToken ───────────────────────────────────────────────────────────
+
+  it('switchToken cancels pending writes and does not flush old tree to new account', async () => {
+    storage[TOKEN_KEY] = FIXED_UUID;
+    const api = makeMockApi();
+    const store = configure(api);
+    await store.init();
+
+    // Mutate, then switch BEFORE the debounce fires.
+    store.addPage('old-account');
+    api.getData.mockResolvedValue({ pages: [] });
+    store.switchToken(OTHER_TOKEN);
+
+    // Run all timers — the OLD debounce must have been cancelled,
+    // so no PUT should have happened.
+    await vi.advanceTimersByTimeAsync(2000);
+    expect(api.putData).not.toHaveBeenCalled();
+    expect(store.token()).toBe(OTHER_TOKEN);
+  });
+
+  it('switchToken invalidates an init already in flight', async () => {
+    storage[TOKEN_KEY] = FIXED_UUID;
+    const api = makeMockApi();
+    let resolveFirstGet: ((v: TreeDto) => void) | null = null;
+    api.getData
+      .mockReturnValueOnce(new Promise<TreeDto>((res) => (resolveFirstGet = res)))
+      .mockResolvedValueOnce({ pages: [mkPage('new-account')] });
+    const store = configure(api);
+
+    const firstInit = store.init();
+    store.switchToken(OTHER_TOKEN);
+    resolveFirstGet!({ pages: [mkPage('old-account')] });
+    await firstInit;
+
+    expect(api.getData).toHaveBeenCalledWith(OTHER_TOKEN);
+    expect(store.token()).toBe(OTHER_TOKEN);
+    expect(store.pages()[0].name).toBe('new-account');
+  });
+
+  it('switchToken cancels a pending retry without wedging future saves', async () => {
+    storage[TOKEN_KEY] = FIXED_UUID;
+    const api = makeMockApi();
+    api.putData
+      .mockRejectedValueOnce(httpError(429, { 'Retry-After': '30' }))
+      .mockResolvedValue(undefined);
+    const store = configure(api);
+    await store.init();
+
+    store.addPage('old-account');
+    await vi.advanceTimersByTimeAsync(750);
+    expect(api.putData).toHaveBeenCalledTimes(1);
+
+    api.getData.mockResolvedValue({ pages: [] });
+    store.switchToken(OTHER_TOKEN);
+    await vi.advanceTimersByTimeAsync(0);
+
+    store.addPage('new-account');
+    await vi.advanceTimersByTimeAsync(750);
+
+    expect(api.putData).toHaveBeenCalledTimes(2);
+    expect(api.putData.mock.calls[1][0]).toBe(OTHER_TOKEN);
+    expect((api.putData.mock.calls[1][1] as TreeDto).pages[0].name).toBe('new-account');
+  });
+
+  it('does not load another account cache after switching tokens', async () => {
+    storage[TOKEN_KEY] = FIXED_UUID;
+    storage[CACHE_KEY] = JSON.stringify({ pages: [mkPage('old-cache')] } satisfies TreeDto);
+    const api = makeMockApi();
+    const store = configure(api);
+    await store.init();
+
+    api.getData.mockRejectedValue(httpError(0));
+    store.switchToken(OTHER_TOKEN);
+    await vi.advanceTimersByTimeAsync(0);
+
+    expect(storage[OTHER_CACHE_KEY]).toBeUndefined();
+    expect(store.pages()).toHaveLength(0);
+  });
+
+  it('switchToken rejects a non-UUIDv4 input', () => {
+    storage[TOKEN_KEY] = FIXED_UUID;
+    const api = makeMockApi();
+    const store = configure(api);
+
+    store.switchToken('not-a-uuid');
+    expect(store.token()).toBe(''); // never initialized
+  });
+
+  it('switchToken canonicalizes uppercase UUID input', async () => {
+    storage[TOKEN_KEY] = FIXED_UUID;
+    const api = makeMockApi();
+    const store = configure(api);
+    await store.init();
+
+    store.switchToken(OTHER_TOKEN.toUpperCase());
+    await vi.advanceTimersByTimeAsync(0);
+
+    expect(store.token()).toBe(OTHER_TOKEN);
+    expect(storage[TOKEN_KEY]).toBe(OTHER_TOKEN);
+  });
+
+  // ── Cross-tab sync ────────────────────────────────────────────────────────
+
+  it('adopts a fresh cache written by another tab via the storage event', async () => {
+    storage[TOKEN_KEY] = FIXED_UUID;
+    const api = makeMockApi();
+    const store = configure(api);
+    await store.init();
+    expect(store.pages()).toHaveLength(0);
+
+    const otherTabTree = { pages: [mkPage('from-other-tab')] };
+    window.dispatchEvent(
+      new StorageEvent('storage', {
+        key: CACHE_KEY,
+        newValue: JSON.stringify(otherTabTree),
+      }),
+    );
+
+    expect(store.pages()).toHaveLength(1);
+    expect(store.pages()[0].name).toBe('from-other-tab');
+  });
+});

frontend/src/app/utils/color.ts

@@ -0,0 +1,32 @@
+import { HslColor } from '../models';
+import { hash } from './hash';
+
+/**
+ * Lighten (or darken) an HslColor by a number of percentage points.
+ * `byPercentPoints` is in raw percent (e.g. 25 means +25 lightness points out of 100).
+ * Clamps the result to [0, 1].
+ */
+export function lighten(byPercentPoints: number, c: HslColor): HslColor {
+  let newL = c.l * 100 + byPercentPoints;
+  if (newL > 100) newL = 100;
+  else if (newL < 0) newL = 0;
+  return { h: c.h, s: c.s, l: newL / 100 };
+}
+
+/**
+ * Converts an HslColor (all values 0–1) to a CSS hsl() string.
+ * Note: the new app stores h/s/l normalised to [0, 1].
+ */
+export function toCss(c: HslColor): string {
+  return `hsl(${c.h * 360}, ${c.s * 100}%, ${c.l * 100}%)`;
+}
+
+/**
+ * Derive a per-tag color by offsetting the tower's base lightness deterministically.
+ * Uses FNV-1a hash → offset in [−25, +25) lightness percentage points.
+ * All blocks in the same tower vary in lightness only, preserving the hue and saturation.
+ */
+export function getColorOfTag(tag: string, base: HslColor): string {
+  const offset = (hash(tag) - 0.5) * 50; // → [−25, +25) percentage points
+  return toCss(lighten(offset, base));
+}

frontend/src/app/utils/hash.ts

@@ -0,0 +1,20 @@
+/**
+ * Deterministic hash of a string returning a value in [0, 1).
+ *
+ * Ports the legacy hash.ts exactly:
+ *   h = ((h << 5) - h + charCode) | 0,  seed = 7
+ *   result = h / (2^32 - 2) + 0.5
+ *
+ * The legacy formula keeps the same distribution as the original Angular 7
+ * reference so per-tag block colours are stable across the port.
+ */
+export function hash(s: string): number {
+  if (!s) return 0;
+  let h = 7;
+  for (let i = 0; i < s.length; i++) {
+    // Same bit-ops as legacy: (h << 5) - h  ==  h * 31, truncated to int32
+    h = ((h << 5) - h + s.charCodeAt(i)) | 0;
+  }
+  // Map the signed int32 to [0, 1) — same formula as legacy
+  return h / (2 ** 32 - 2) + 0.5;
+}

frontend/src/index.html

@@ -0,0 +1,39 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <title>Life Towers</title>
+    <base href="/" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <meta name="theme-color" content="#5d576b" />
+    <meta name="description" content="Organise your tasks into visual towers of blocks, grouped on pages." />
+
+    <link rel="icon" type="image/svg+xml" href="favicon.svg" />
+    <link rel="icon" type="image/x-icon" href="favicon.ico" />
+    <link rel="apple-touch-icon" href="apple-touch-icon.png" />
+    <link rel="manifest" href="manifest.webmanifest" />
+
+    <link rel="canonical" href="/" data-dynamic-url="canonical" />
+    <meta property="og:title" content="Life Towers" />
+    <meta property="og:description" content="Organise your tasks into visual towers of blocks, grouped on pages." />
+    <meta property="og:type" content="website" />
+    <meta property="og:url" content="/" data-dynamic-url="canonical" />
+    <meta property="og:site_name" content="Life Towers" />
+    <meta property="og:locale" content="en_US" />
+    <meta property="og:image" content="/og-image.png" data-dynamic-url="og-image" />
+    <meta property="og:image:secure_url" content="/og-image.png" data-dynamic-url="og-image" />
+    <meta property="og:image:type" content="image/png" />
+    <meta property="og:image:width" content="3333" />
+    <meta property="og:image:height" content="1750" />
+    <meta property="og:image:alt" content="Life Towers task towers preview" />
+    <meta name="twitter:card" content="summary_large_image" />
+    <meta name="twitter:title" content="Life Towers" />
+    <meta name="twitter:description" content="Organise your tasks into visual towers of blocks, grouped on pages." />
+    <meta name="twitter:image" content="/og-image.png" data-dynamic-url="og-image" />
+    <meta name="twitter:image:alt" content="Life Towers task towers preview" />
+  </head>
+  <body>
+    <app-root></app-root>
+    <noscript>Please enable JavaScript to continue using this application.</noscript>
+  </body>
+</html>