When the maintenance worker flags an incomplete album, users can now
click "Auto-Fill" to automatically locate missing tracks in the library,
move/copy them into the album folder, and apply full metadata enhancement
(MusicBrainz, Deezer, cover art, etc.). Singles are moved; tracks from
multi-track albums are copied. Quality gate prevents filling FLAC albums
with lossy files. Tracks not found in library are added to wishlist with
album context for auto-download.
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