Malin e772fb5cc0 feat: time-based credits, JUGADORES leaderboard, fix footer visibility ...

- Credits system: 1€/day, 5€/week, 15€/month time-based access via Redsys
  - credits table with token, tier, expires_at, status lifecycle
  - /api/credito/iniciar, /api/credito/estado, /api/pregunta/enviar endpoints
  - Polling-based token delivery to browser after Redsys URLOK redirect
  - localStorage token storage with expiry check on load
- JUGADORES leaderboard: top 7 players by questions used, polled every 60s
  - /api/jugadores endpoint, PlayerLeaderboard component in Standings sidebar
- Footer: moved into Standings sidebar (.standings__footer) so it's always visible
- pregunta.tsx: complete redesign with tier cards, credit badge, spinner, success state
- pregunta.css: new styles for tier cards, input, badge, spinner, success, link-btn

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

2026-02-27 14:43:25 +01:00

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