Swap the fake gallery tiles' gradient stand-ins for 13 rights-clean
generated WebP stills (512px, ~25 KB each). Search demo now returns
thematically matched results — beach/dunes for the filename query, sunset
and water for /s, landscapes for /t — so the show-don't-tell steps look
like a real library. tileGradient retained for the abstract Explore and
Timeline mini-previews.
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