feat(captions): add list_system_fonts command with fc-list + fallback

Co-authored-by: Cursor <cursoragent@cursor.com>

src/lib/bindings/mediaAnalysis.ts

@@ -1,4 +1,4 @@
-import { invoke } from '@tauri-apps/api/core';
+import { invoke, Channel } from '@tauri-apps/api/core';
 
 export interface ThumbnailSpritesheet {
   filePath: string;
@@ -10,15 +10,33 @@ export interface ThumbnailSpritesheet {
   intervalSeconds: number;
 }
 
+export interface WaveformTiers {
+  /** ~2,000 peaks — overview for full-duration view */
+  tier0: number[];
+  /** ~10,000 peaks — moderate zoom */
+  tier1: number[];
+  /** All extracted peaks — deep zoom */
+  tier2: number[];
+}
+
 export async function extractKeyframes(filePath: string): Promise<number[]> {
   return invoke<number[]>('extract_keyframes', { filePath });
 }
 
-export async function extractWaveform(
+export async function extractWaveformTiers(
   filePath: string,
-  sampleCount: number
-): Promise<number[]> {
-  return invoke<number[]>('extract_waveform', { filePath, sampleCount });
+  duration: number,
+  onProgress?: (pct: number) => void
+): Promise<WaveformTiers> {
+  const channel = new Channel<number>();
+  if (onProgress) {
+    channel.onmessage = onProgress;
+  }
+  return invoke<WaveformTiers>('extract_waveform_tiers', {
+    filePath,
+    duration,
+    onProgress: channel,
+  });
 }
 
 export async function extractThumbnails(
@@ -34,3 +52,13 @@ export async function extractThumbnails(
 export async function cleanupThumbnails(paths: string[]): Promise<void> {
   return invoke<void>('cleanup_thumbnails', { paths });
 }
+
+export async function checkEmbeddedSubtitles(
+  filePath: string
+): Promise<string | null> {
+  return invoke<string | null>('check_embedded_subtitles', { filePath });
+}
+
+export async function listSystemFonts(): Promise<string[]> {
+  return invoke<string[]>('list_system_fonts');
+}