[dylanjeffers]

Summary

Large desktop track tiles get a SoundCloud-style bar waveform between the title and the stats row. Comments with a track timestamp sit on the baseline as avatars.

• Click the waveform to seek the playing track, or start the tile at that point (same play-then-seek pattern as the comments context). Gated tracks without access fall through to the unlock flow.
• Hover an avatar for the comment; click opens it highlighted on the track page (?commentId=; the /comments subroute is mobile-only and redirects on desktop).
• Comments are fetched once per tile, only for tiles with a nonzero comment count that have scrolled near the viewport.
• useTimestampedComments moves from mobile into @audius/common/api so the Now Playing scrubber and the tile share it.

No node serves audio peaks, so the bar shape is synthesized from the track id with a seeded generator. It is stable per track but not the audio. Real peaks need a backend endpoint.

Flag

track_tile_waveform: code default on in development, off in production. The Optimizely flag exists in Audius Dapp with a Production rule delivering Off, so this ships dark.

Test plan

• Web + mobile typecheck, lint
• TrackTile.test.tsx passes
• Verified on Trending: seek on active and inactive tiles, avatar tooltip and click-through, light and dark

🤖 Generated with Claude Code

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