Search results now show switchable tabs for alternate metadata sources.
Primary source renders immediately, alternate sources load in parallel
and tabs appear progressively as each completes.
- New /api/enhanced-search/source/<name> endpoint for per-source queries
- Source-aware routing via ?source= param on discography, album tracks,
album detail, and artist image endpoints (prevents numeric ID
misrouting between iTunes and Deezer)
- Source override stored on artistsPageState for consistent navigation
- Tabs styled with source brand colors, show result counts
- All additive — users who ignore tabs see zero behavioral change
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