- Concert Finder: Bandsintown API integration to find upcoming shows for
recommended artists, with expandable tour dates section on recommendation cards
- Rabbit Hole: Multi-step guided discovery journey where each song connects
to the next through a shared musical quality (producer, influence, tone, etc.)
- New /rabbit-hole route with seed input, step count selector, and vertical
chain visualization of connected songs
- Added concerts endpoint, rabbit hole endpoint, and corresponding frontend
API functions and navigation
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