Ports Flutter's CachedIndicator (circle_check_big, size 14, accent, 4px
left pad) to all 5 track-row screens (Album, History, Liked, Playlist,
Search). CachedTrackIds exposes a reactive Set of trackIds with bytes in
Media3's SimpleCache — true on-disk residency (keyed per track via the
custom cache key from slice 1), so an evicted track loses its dot. Read
through a LocalCachedTrackIds CompositionLocal provided at the app root,
mirroring the existing LocalDetailSeedCache pattern, so leaf rows need no
per-screen plumbing. The persisted cache is read eagerly, so dots paint
for previously-cached tracks even when the library is opened offline.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
bvandeusenandClaude Opus 4.7
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