docs(plan): add web UI library views implementation plan
14 TDD tasks: API types, formatDuration + covers helpers, useDelayed rune, TanStack Query wrappers, 5 shared components (ArtistRow, AlbumCard, TrackRow, LibrarySkeleton, ApiErrorBanner), 3 page routes (/, /artists/:id, /albums/:id) with mocked-query integration tests, and a final verification + branch-finish step. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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