Implements real-time event streaming on the frontend with:
- Event types and type guards matching backend EventType enum
- Zustand-based event store with per-project buffering
- useProjectEvents hook with auto-reconnection and exponential backoff
- ConnectionStatus component showing connection state
- EventList component with expandable payloads and filtering
All 105 tests passing. Follows design system guidelines.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>