- Stale-cache check (playlistTrackCacheIsStale) compared raw track_count to the
filtered/cached track list, so any playlist with local or unavailable tracks
always looked 'stale' and refetched + re-mirrored on every modal open. Now it
compares the upstream snapshot_id (stored at cache time in the shared fetch
choke point), and returns not-stale when no snapshot is available — explicit
invalidation on refresh still handles real changes.
- organize_download: guard executor.submit so a refused job cleans up the batch
instead of stranding it in 'analysis' (holding a limited analysis slot).
- Removed the dead, deprecated, unused mirrorSpotifyPlaylistTracks.
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