Spec 2026-07-19-local-album-grouping-mode (A2-A5 + i18n). The Albums tab
gains a third header dropdown ('Albums by folder' / 'Albums by metadata')
and Settings > Local Library a matching 'Album grouping' row — both write
the same pref: LocalLibraryState.albums-id-mode, persisted in
locallibrary_ui.json (default 'folder': compilations and box sets stay
whole; the metadata split stays opt-in for #411's use case).
The group key changes with the mode, so switching reloads the Albums set
(reload_albums) and invalidates the Artists tab (its album cache groups
the same way — a folder-mode compilation cross-lists under every artist
in all_artists, the owner's 'appears in all artists' ask). Threaded
through spawn_albums_load, seed_counts, the Plex quality-hydration
aggregate lookup, and the artists feed; myqbz_builder pins Metadata
(artist-scoped candidates, not the Albums view).
5 msgids x 8 locales (msgfmt clean); slintcheck green.
km