Major speedups for large-folder thumbnail generation:
- JPEGs decode through mozjpeg at the smallest DCT scale covering
320px instead of full resolution, with catch_unwind and a fallback
to the image crate for anything mozjpeg rejects. EXIF orientation
preserved in both paths.
- RGB8 pipeline end to end (no RGBA round-trip) and CatmullRom resize
in place of Lanczos3.
- Video posters grab the seeked frame directly instead of running the
ffmpeg thumbnail filter (which decoded ~100 frames), with decode
threads capped at 2 per process.
- Workers only sleep when the queue is empty rather than 250ms after
every batch. Image batches commit before videos start, and videos
run sequentially off the rayon pool (blocking ffmpeg waits were
starving image decode) with per-item commits so progress keeps
moving through slow stretches.
Sets up Tauri v2 + React frontend with SQLite metadata store,
sqlite-vec for CLIP embedding infrastructure, and r2d2 connection
pool replacing the single Arc<Mutex<Connection>>. Indexer now uses
rayon for parallel file metadata collection.
LyAhn