Return to lobby (replay without recreating the room):
- lobby:return (host): reset to lobby, scores to 0, keep players + tracks
- client: end screen has "Rejouer" (host) + "Quitter"; store clears transient
game state whenever the room goes back to lobby
Contributor has nothing to input:
- round:start carries a private `mine: true` to the contributor only (via
RoundStart.secretPlayerId targeted emit); they're excluded from eligible
voters. Client shows a "fais-les se tromper" card instead of the vote form.
Editable track submission:
- submitTrack ack returns trackId + youtubeId; new blindtest:removeTrack
- lobby shows submitted tracks as cards (YouTube thumbnail + title) with delete
Verified e2e (3 players): add/remove, private mine flag, return-to-lobby reset.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>