WebSocket Real-time Updates (Client)

[buddha314]

Summary

Implement WebSocket connection in the BabylonJS client to receive real-time updates from the server for agent tasks, document processing, and events.

Priority: P1 (High)
Estimated Time: 4-6 hours
Labels: client, websocket, realtime, P1, phase-2

Key Tasks:

• Create lib/api/websocket.ts with auto-reconnect
• Create lib/hooks/useWebSocket.ts
• Create Notification component
• Integrate with DocumentUploader (show upload progress)
• Subscribe to all event types
• Connection status indicator

Dependencies:

• Issue Client API Infrastructure Setup #36: Client API Infrastructure
• Server Issue WebSocket Handler for Real-time Updates #21: WebSocket Handler (must be implemented first)

Note: Server Issue #21 must be completed before this can be fully tested.