Replaces the transitional two-LazyRow shape with the proper 5-tab
Library matching `flutter_client/lib/library/library_screen.dart`:
[Artists] [Albums] [History] [Liked] [Hidden]
- Artists / Albums — real adaptive 3+-up LazyVerticalGrid backed by
the existing LibraryViewModel (cache-first reads of cached_artists
/ cached_albums). GridCells.Adaptive sizes from card width
(ArtistCard 144dp, AlbumCard 176dp), so phones get 3 cols and
tablets pack more.
- History / Liked / Hidden — EmptyState placeholders with phase
pointers (Phase 9 / 8 / 10 respectively). The data-layer plumbing
for each lands with its umbrella phase, not as a Home/Library
polish patch.
TabBar is `PrimaryScrollableTabRow` (Material3) so on narrower screens
the row scrolls horizontally without truncating labels — same
behavior as Flutter's `TabBar(isScrollable: true)`.
The Library tab is now reachable both as the in-shell route AND
through MainAppBarActions; the icon row suppresses the Library icon
when this screen is current (per `currentRouteName = Library::class.qualifiedName`).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
bvandeusen
6062233c63