Show GenreBadge between artist and "Added by" when song has a genre.
Add SongCard component tests for genre badge rendering.

Add topGenre field to PastRound interface and render GenreBadge
in past rounds cards below the song/artist info.

Build artifacts in android/ were being linted unnecessarily.
console.error in catch blocks is legitimate error logging, not debug noise.

Substring matching caused false positives ("popular" matched "pop",
"countryside" matched "country"). Replaced with explicit aliases for
common Last.fm tag variants. Added tests for false-positive scenarios.

LASTFM_API_KEY is not exposed to client bundles (no PUBLIC_ prefix).
Genre detection was dead code in production. Now the server endpoint
detects genre and includes it as _detectedGenre in the response.

Validate genre against GENRES whitelist before Supabase insert to
prevent arbitrary strings. Add LASTFM_API_KEY to env validation schema.

- Add PastRounds tests (genre badge, empty state, scores, locale)
- Add SongCard tests (title/artist render, "Your track" state)
- Fix test assertions: toBeDefined -> toBeInTheDocument
- Fix test name: "capitalize" -> "render as-is" for unknown genres
- Replace loop with it.each in lastfm hip-hop variants
- Use GENRES.length instead of magic number 20
- Change odesli mock default to null for neutral behavior