snapshot

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

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+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, page-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));
+  }
+}