Phase 3: Add design tokens and standardize values
Design tokens added:
- ButtonSizes: sm/md/lg/xl/xxl for touch targets, iconSm/iconMd/iconLg/iconXl
- StatusColors: success/error/warning/info with light/dark variants, favorite
Standardization:
- Library filter buttons now use ButtonSizes.md (36) and ButtonSizes.iconMd (18)
- Favorites button uses StatusColors.favorite instead of Colors.red
- All BorderRadius.circular(22) and circular(25) → Radii.xxl (24)
Files updated:
- album_details_screen, artist_details_screen, audiobook_detail_screen
- playlist_details_screen, search_screen, new_library_screen
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
