Implement a new UI section that surfaces agents requiring user attention at the top of the agent list. This includes agents that are running, have pending permissions, or have errors.
**Backend changes:**
- Add `requiresAttention` field to agent projections and SDK types
- Implement logic in AgentManager to detect attention states (running, pending permissions, errors)
- Add WebSocket message handler to notify clients of attention state changes
- Update session state to include attention tracking
**Frontend changes:**
- Add "REQUIRES ATTENTION" section in agent-list component with visual prominence
- Update useAggregatedAgents hook to expose `requiresAttention` agents
- Enhance session store to track and update attention states
- Add real-time updates via WebSocket for attention state changes
- Update type definitions across agent directory and stream types
Verified working via Playwright MCP testing on localhost:8081.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
