Mattias Thall 27f17c16ef Fix subtitle playback: vtt format, track elements, fast disk scan ...

- Convert subs to .vtt (was .srt which browsers don't support in <track>)
- Add GET /subtitle-files endpoint: instant disk scan for .vtt sidecar files,
  no yt-dlp call needed
- Inject <track> elements into the video player for each .vtt on disk;
  browser CC button appears automatically
- Before download: CC chip triggers YouTube availability check (slow, on demand)
- After download with subs: shows "CC ✓" — subtitles live in the player controls

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-05-26 21:11:58 +02:00

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