Library + Home artist tiles were blank: cached_artists stores no cover and the sync payload (SyncArtistWire) carries none. Mirror Flutter's artistTileProvider JOIN — ArtistRef gains coverAlbumId + a displayCoverUrl getter; LibraryRepository.observeArtists and MetadataProvider.observeArtist combine artists with albums to supply the first album (by sort title) as the cover source. ArtistCard renders displayCoverUrl through ServerImage. Updated LibraryRepositoryTest to stub albumDao.observeAll so combine emits.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
bvandeusen
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