The lobby now populates from PresenceList signal events:
- Relay broadcasts user list on register/deregister
- JS receives "presence_list" signal-event
- Updates lobbyUsers map (excluding self)
- Renders user rows with identicon, name, fingerprint
Users appear in the lobby as soon as they register their
signal channel — no need to join voice first.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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