Audit v2 #14. Artists + Albums search sections were rendering as
plain vertical TextRows (name-only for artists, title+artist for
albums). Now match Flutter:
* Artists: horizontal LazyRow of ArtistCard (cover + name)
* Albums: horizontal LazyRow of AlbumCard (cover + title + artist)
* Section headers gain a count suffix ("Artists 12") matching
Flutter's _SectionHeader pattern; also applied to the Tracks header
for consistency.
Removed the now-unused TextRow helper.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
bvandeusenandClaude Opus 4.7
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