Visual canvas map on Discover page showing watchlist artists as large
anchor bubbles surrounded by their similar artists, sized by relevance.
Layout: golden angle spiral for watchlist nodes with push-apart guarantee,
spiral packing with spatial grid collision detection for similar artists.
Offscreen buffer rendering for smooth pan/zoom (single drawImage blit).
Features:
- 320px watchlist bubbles, similar sized 25-55% by rank/occurrence
- Search bar with instant filter + animated zoom-to-node
- Tooltip with artist photo, name, genre tags on hover
- Touch support: single finger pan, pinch zoom, tap to click
- Zoom +/- buttons and fit-to-screen with smooth 250ms animation
- Click opens artist info modal (same as Your Artists)
- Loading overlay with image count progress
- Async image loading via createImageBitmap (non-blocking)
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