- Add ErrorBoundary class component to catch React render errors
- Show fallback UI with error details (stack in dev mode) and recovery buttons
- Add ErrorDisplay component for showing structured McError messages
- Support all McErrorCode types with contextual messages and install guides
- Implement retry/dismiss actions for recoverable errors
- Add 16 comprehensive tests covering both components
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
