New "Download Discography" button in artist hero section opens a modal
showing the full catalog — albums, EPs, and singles — with filter
toggles, select/deselect all, and per-album owned/missing indicators.
Modal features:
- Glassmorphic design with artist image blurred background header
- Filter pills for Albums/EPs/Singles with instant grid filtering
- Album cards with cover art, year, track count, and checkbox
- Owned albums dimmed and unchecked by default, missing pre-selected
- Live NDJSON streaming: each album updates in real-time as processed
- "Process Wishlist Now" button after completion
- Albums sorted by track count (Deluxe first) to prevent duplicate
folder contexts from standard/deluxe edition ordering
Backend: NDJSON streaming endpoint POST /api/artist/<id>/download-discography
- Fetches tracks per album via active metadata client
- Adds to wishlist with dedup (no slow fuzzy matching)
- Streams one JSON line per album as it completes
- Works on both Artists search page and Library artist detail page
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