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Direct call ringing: - Incoming: oscillator ring tone (440/480Hz, on/off pattern) - Outgoing: ringback tone (2s on, 4s off) while waiting for answer - Browser Notification API for background incoming calls - All tones stop on answer/reject/hangup - Notification permission requested on first click Group calls: - /gcall — start a group call (notifies all group members) - /gjoin — join an active group call - /gleave-call — leave group call - /gmute — toggle per-group call notification mute (localStorage) - Participant tracking (joined/left messages with count) - Group call signal via group message broadcast (JSON type: group_call) - Call bar shows "Join Call" button when group call is active - Audio via same WZP bridge (room = gc-<groupname>) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>