- Add frontend/lib/api.ts with typed API client for conversations, tickets, and SSE chat streaming
- Replace simulateAIResponse() with real SSE streaming via POST /api/chat/stream
- Replace MOCK_CONVERSATIONS with GET /api/conversations
- Replace MOCK_TICKETS with GET /api/tickets
- Lift activeTools and selectedModel state from GeminiInput to GeminiChat for API integration
- Load conversation messages on demand via GET /api/conversations/{id}
- Backend URL configured via NEXT_PUBLIC_API_URL in .env.local
Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>