New visitors (no nickname in localStorage) get a blocking welcome modal instead of a silently-generated guest-N name, so everyone in a room has a name they actually chose. It doubles as quick-start help (join a channel, mic/deafen/share shortcuts, drag-to-reposition on the spatial map) reachable any time via the new ? button. The sidebar nick field no longer falls back to a random name when cleared — it now just rejects the blank edit. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>