Rewrote the AcoustID scanner job to scan all library tracks (via DB file
paths resolved to disk) instead of only the Transfer folder. Checkpoints
by track ID for robust resume across restarts. Defaults changed to
enabled, 24h interval, batch size 200.
Added _fix_acoustid_mismatch handler with three actions:
- retag: update DB title/artist to match actual audio content
- redownload: add expected track to wishlist and delete wrong file
- delete: remove wrong file and DB record
This catches cases like a file tagged as "Dinosaur Bones" that is
actually "Helicopters" — the scanner fingerprints the audio, detects
the mismatch, and the user can fix it from Library Maintenance findings.
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