HiFi (and occasionally other) downloads sometimes deliver a ~30s preview clip instead of the
full song; it lands in the library looking real. new repair job scans short tracks (duration
<= 30s, configurable), looks up the EXPECTED length from the track's metadata source
(spotify/itunes/mb get_track_details), and flags any whose real length is much longer than the
file (default: >= 30s longer) as a preview clip.
approving the finding (repair_worker._fix_short_preview_track) deletes the preview file (path
resolved via _resolve_file_path like the other delete tools), drops the DB row so the track
goes missing, and re-adds it to the wishlist with the full payload (mirrors _fix_dead_file)
so the real version downloads. scan ONLY creates findings — nothing destructive without user
approval, like every other tool.
conservative: genuine short tracks (source agrees they're short) and tracks whose length can't
be verified are skipped, never flagged. registered the job + finding-type label/fix-button in
the UI. 5 tests (scan flag/skip/scope + fix delete+remove+wishlist); 89 repair tests green.
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