* feat(ui): StarFilterButton component + common i18n keys
Reusable toggle button for "favorites only" filtering. Three size
variants for different toolbar contexts:
- default: icon + label (Albums-style)
- compact: icon-only with 0.5rem padding (Artists view-mode buttons)
- small: icon + label at 12px / 4×14 padding (AdvancedSearch tabs)
Adds common.favorites + favoritesTooltipOff/On in all 8 locales.
* feat(library): "favorites only" filter on Albums, Artists, AdvancedSearch
Client-side filter using the existing useMemo pipelines on each page.
Reads starred state from item.starred + playerStore.starredOverrides
(O(1) Map lookup, picks up live star toggles without refetch).
- Albums: toolbar button (default size) next to compilation filter.
- Artists: toolbar button (compact / icon-only) before the Images toggle.
- AdvancedSearch: toolbar button (small) next to the result-type tabs;
filters all three result categories (artists / albums / songs) and
updates the count badges accordingly.
Filter state is ephemeral per-page (not persisted) so users don't get
surprised by hidden items after a restart. Zero extra server calls.
* docs(contributors): credit + changelog entry for #466
Frank Stellmacher