feat(mobile): comprehensive mobile UI overhaul (#238)

RandomMix: filters and genre mix panels collapse on mobile
- RandomAlbums / album grids: auto-fill favouring 3 columns at narrow widths
- BottomNav: More button opens a bottom sheet with remaining nav items
- MobileMoreOverlay: new sheet component with backdrop and slide-up animation
- Tracklist: mobile Title / Artist two-line stacked layout (Apple Music style)
- ArtistDetail: centred header (photo → name → buttons), icon-only buttons
  except Play All, collapsible Similar Artists (5 default), 2-column album
  grid, avatar glow derived from dominant cover colour
- Settings: fixed overflow in ReplayGain, Crossfade, mix rating filters,
  theme scheduler, and Next Track Buffering sections

Co-authored-by: kilyabin <65072190+kilyabin@users.noreply.github.com>

src/locales/nb.ts

@@ -30,6 +30,7 @@ export const nbTranslation = {
     allLibraries: 'Alle biblioteker',
     expandPlaylists: 'Utvid spillelister',
     collapsePlaylists: 'Skjul spillelister',
+    more: 'Mer',
   },
   home: {
     hero: 'Utvalgt',