The Top Tracks sidebar play button on the artist-detail page (and the
same buttons on the Stats page) called /api/stats/resolve-track and
gave up with a 'Track not found in library' toast on a miss.
Now when the library lookup misses, falls through to /api/enhanced-
search/stream-track — the same Soulseek/YouTube/streaming-source
pipeline the search-results play button uses. So Last.fm popular
tracks, recent plays, and stats artist top tracks all play even if
you don't own the track yet.
Library hit still wins (faster, full quality). Only on miss does it
escalate to streaming. Final error toast updated to reflect both
paths having been tried.
Adds a full Discover Sync tab to the Sync page with:
- Core UI scaffolding, playlist modal, empty-state handling
- ListenBrainz playlist integration with auto-update toggle persistence
- Sync progress tracking with matched/total counts on cards
- Navidrome playlist push on batch completion (V1 and V2 paths)
- Active download state display with polling resume on page reload
- Stuck-download detection for downloading and catch-all states
- Serialized sync queue to prevent concurrent backend contention
- Source badges, compact card layout, URL fixes
