Restructure onboarding (option B):
- home is just Create / Join (code) — no name field
- name is chosen in the room: room:create/join no longer require a name;
new player:setName event. Nameless players are hidden from the snapshot
(players/scores/submissions) and excluded from eligible voters and the
3-player blindtest gate until they pick a pseudo.
- PseudoScreen with live DiceBear avatar preview gates RoomPage until set
- /join/:code auto-joins then redirects to the room (seamless invite links)
- RoomCode gains a "copier le lien" button (origin/join/CODE)
Verified e2e: nameless players excluded from the room until setName.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>