useVoiceChannelFull compared the number of MatrixRTC memberships (one per
device) with io.lotus.voice_limit, so one person on desktop + phone, or a
crashed tab whose membership hadn't expired, filled two slots and locked
others out, while the server-side guard (which counts distinct users)
would have admitted them. utils/voiceChannelFull.ts (unit-tested) counts
distinct senders; the header/sidebar counter shows people too.
Verified on the local stack: limit 2, @aud_main in the call on two
devices; @aud_bob's prescreen now shows 1/2 with Join enabled (was
"Channel Full (2/2)"), matching the guard's 200.
Fixes#342
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5