New dedicated Explorer page with interactive node graph visualization.
Users select a mirrored playlist, choose Albums or Discographies mode,
and the app builds a branching tree: playlist root → artist nodes →
album nodes → track nodes. Supports all metadata sources (Spotify,
iTunes, Deezer) with source-aware discovery cache integration.
Features:
- Streaming NDJSON builds tree progressively as artist data arrives
- Circular artist nodes with photos, rounded album nodes with art
- SVG bezier connections that draw in on completion, fade on hover
- Click artist to expand albums, double-click album for track listing
- Single-click albums to select, Select All/Deselect for bulk ops
- Wishlist confirmation modal with per-album progress (NDJSON streaming)
- Artist nodes glow when any of their albums are selected
- Playlist picker with source tabs, discovery % gate (50% minimum)
- Zoom (scroll/pinch/buttons), pan (right/middle-drag), fit-to-view
- Metadata cache for discographies and album track listings
- Owned album detection from library database
- Fallback track-name matching when album names are missing
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