Web client:
- Call bar between header and messages (hidden when idle)
- Call button appears when peer is set (not group)
- Incoming call: pulsing notification + Accept/Reject buttons
- Call states: idle → calling → ringing → active
- /call, /accept, /reject, /hangup slash commands
- CallSignal sent via WS binary frames (same as messages)
- handleCallSignal processes Offer/Answer/Hangup/Reject/Ringing/Busy
- Vibration on incoming call (mobile)
- create_call_signal WASM import wired up
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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