More FE changes

video/src/preflight.ts

@@ -0,0 +1,32 @@
+import { existsSync, mkdirSync, writeFileSync } from 'node:fs';
+import { join } from 'node:path';
+import { OUTPUT_DIR } from './config.js';
+import { storyboard } from './storyboard.js';
+
+/**
+ * Emit the narration script for the synth step.
+ *
+ * Synth (tts/synth.py) runs BEFORE recording, so it needs the full ordered
+ * narration list — text + per-cue gaps — without depending on Playwright,
+ * the dashboard, or auth. Walk the storyboard cues, write a flat manifest,
+ * exit.
+ *
+ * The cue index in this manifest is the source of truth: the runner later
+ * matches storyboard cues to measured durations by index.
+ */
+function main(): void {
+  if (!existsSync(OUTPUT_DIR)) mkdirSync(OUTPUT_DIR, { recursive: true });
+
+  const items = storyboard.cues.map((cue, cueIndex) => ({
+    cueIndex,
+    text: cue.text.trim(),
+    gapBeforeMs: cue.gapBeforeMs,
+  }));
+
+  const manifest = { items };
+  const path = join(OUTPUT_DIR, 'narration-script.json');
+  writeFileSync(path, JSON.stringify(manifest, null, 2));
+  console.log(`Wrote ${items.length} narration cues to ${path}`);
+}
+
+main();