Mirrors Flutter's PlayCircleButton (library/widgets/play_circle_button.dart)
on the Home AlbumCard / ArtistCard / PlaylistCard surfaces. 44dp accent
disc bottom-right of the cover, parchment Play icon, self-managed
spinner during the fetch-and-queue setup, drop shadow.
New: shared/widgets/PlayCircleButton.kt. Cards gain an opt-in
onPlay: (suspend () -> Unit)? parameter; when null the overlay is
omitted, preserving the Library / Discover / Search / detail surfaces
unchanged. HomeScreen wires three new HomeViewModel suspend methods:
playAlbum GET /api/albums/{id}, play tracks from 0
playArtistShuffled GET /api/artists/{id}/tracks, FY shuffle, play 0
playPlaylist systemShuffle for refreshable system playlists,
refreshDetail otherwise, 8s timeout
PlaylistsApi gains systemShuffle for the rotation-aware shuffle path
(GET /api/playlists/system/{kind}/shuffle, mirrors playlists.dart).
PlaylistCard play is disabled offline + refreshable (server endpoint
unreachable) and for empty playlists. Album / artist errors surface
via the existing transientMessages snackbar channel, matching the
ArtistDetailViewModel improvement over Flutter's silent fail.
Scope: Home tiles only this slice. Flutter applies the overlay to
the cards everywhere they render; revisit Library / Discover / Search
/ detail surfaces in a follow-up.
bvandeusen
f17610ecd5