Move map_album (V2 nested-first with flat fallback), tier/tier_hires,
release-type classification, to_item and sort_album_items out of
label.rs into a shared album_map module. favorites.rs now maps albums
through it too, so favorite album cards gain the AlbumListRow extras
(release_type / quality_detail / track_count / plain_year) and the
hires-without-bit-depth tier fallback — one implementation to maintain
ahead of the Favorites album list/grid toolbar port.
cc