docs(plan): add web UI player implementation plan
8 TDD tasks: player rune store (2 tasks covering basic actions then shuffle/repeat/audio-reporting), MediaSession glue, click-to-play wiring in TrackRow + album page, PlayerBar component, Shell 3rd-row integration, audio element wiring in root layout, and a final verification + branch-finish step. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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