AlbumCardItem gains is-favorite (filled accent heart on the card +
"Remove from favorites" in the list-row menu) — favorites albums set it
true so the heart shows its state, which it never did before.
Un-favoriting from the favorites list (track heart or album card heart)
now removes the item: the row/card fades out (new `removing` field drives
a 250ms opacity animation on TrackRow / AlbumCard / AlbumListRow), the
favorite is removed on the server (+ fav_cache for tracks), and the row
is dropped from both the full and visible models after the fade. All
TrackItem / AlbumCardItem initializers carry the new fields.
cc
vicrodh
66a9f9da22