New "Rébus" mode: guess the geek work from an emoji puzzle (free-text answer,
tolerant matching). Implemented as a quiz format `rebus` — reuses the whole quiz
machinery (pool, anti-repeat, speed scoring, recap, bots, back-office):
- shared: QuizFormat/GameType/MixMode + RoundConfig.pool gain "rebus"
- server: rebus is a text format; pool composes a rebus sub-pool (not filtered by
category); ~9 seeded emoji rebus in the in-code bank; admin accepts the format
- client: lobby tile + sub-mode + count; big centered emoji display in the round;
dedicated transition theme (🧩 RÉBUS); FR/EN strings; back-office form option
Verified e2e: a rebus game serves only rebus rounds with emoji prompts and the
recap shows the right answers. typecheck/lint/build/24 tests green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
