Closes the per-track-likes gap on PlaylistDetail (Album + Artist
details already had it via Phase 14). Same VM-owned-state pattern:
LikesRepository observeLikedTracks → mutableSet<String> Flow,
toggleLikeTrack via the optimistic-write + MutationQueue path.
Modified:
- playlists/ui/PlaylistDetailScreen.kt — VM gets LikesRepository
injection + `likedTrackIds: StateFlow<Set<String>>` +
`toggleLikeTrack(trackId)`. PlaylistDetailBody threads the set
+ onToggleTrackLike down to each row. TrackRow renders LikeButton
only when the upstream track is still available (greyed-out
rows for removed tracks omit the heart entirely — can't like
something that no longer exists).
Row vertical padding tightened 10dp → 8dp to match the album
track-row sizing now that the heart icon is present.
Cross-restart user persistence is the next commit within this phase.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
bvandeusen
16b3a1e9e2