- Metadata cache backfill: batch-lookup all node names across all sources
to fill missing IDs, images, and genres
- Source-aware navigation: View Discography passes correct source to
artist page so non-active-source artists load correctly
- Constellation hover effect: 800ms delay, fade in/out animation, dim
overlay with glowing connection lines to related artists
- Click ripple animation on node selection
- Related artists list in info modal with clickable navigation
- Rich tooltip with artist photo, name, genres on hover
- Removed node dragging (caused visual desync with offscreen buffer)
- Performance: cached constellation lookups, lighter cache query
(no raw_json), canvas.width for proper DPR overlay coverage
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