Adds Skeletons.kt with five primitives: SkeletonBox (pulsing
surfaceVariant fill, the building block), SkeletonAlbumTile,
SkeletonArtistTile, SkeletonTrackRow, SkeletonSectionHeader. Each
matches the geometry of the real card it stands in for so the
reveal doesn't reflow.
Wires HomeScreen as the first consumer: replaces the cold-load
CircularProgressIndicator with a HomeSkeletonContent LazyColumn
(section header + horizontal album row × 2 + section header +
horizontal artist row), and wraps the state machine in a Crossfade
so Loading → Success cross-fades instead of snapping.
Library + AlbumDetail / ArtistDetail / PlaylistDetail still use
the centered spinner; those land in a follow-up commit.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
bvandeusen
43ee8f9a39