S5: WebSocket real-time — per-channel broadcast, auto-reconnect
Backend:
- AppState with per-channel broadcast::Sender map
- WS handler: auth via first message, keepalive pings, broadcast forwarding
- post_message broadcasts WsEvent::Message to all subscribers
Frontend:
- useChannelSocket hook: connects, auths, appends messages, auto-reconnects
- Removed 3s polling — WebSocket is primary, initial load via REST
- Deduplication on WS messages (sender also fetches after post)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
limiteinductive
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