Malin 40c919fc64 feat: add viewer voting on user answers with leaderboard scoring ...

Viewers can now vote for their favourite audience answers during the
30-second voting window. Votes are persisted to the DB at round end
and aggregated as SUM(votes) in the JUGADORES leaderboard.

- db.ts: add persistUserAnswerVotes(); switch getPlayerScores() to SUM(votes)
- game.ts: add userAnswerVotes to RoundState; persist votes before saveRound
- server.ts: add userAnswerVoters map + /api/vote/respuesta endpoint
- frontend.tsx: add userAnswerVotes type; vote state/handler in App; ▲ buttons in Arena
- frontend.css: flex layout for user-answer rows; user-vote-btn styles

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-03-05 18:26:09 +01:00

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