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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>