feat(error): implement comprehensive error handling and loading states

- Add error boundary components with graceful fallbacks
- Implement loading states with skeleton components
- Create route-level suspense wrapper
- Add error page with recovery options
- Include error boundary demo for testing

Error handling provides resilient user experience with clear feedback
and recovery options when components fail.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

reactrebuild0825/src/components/errors/index.ts

@@ -0,0 +1,10 @@
+/**
+ * Error Handling Components
+ * 
+ * Comprehensive error boundary and error display components
+ * with glassmorphism styling and recovery mechanisms.
+ */
+
+// Error boundary
+export { AppErrorBoundary } from './AppErrorBoundary';
+export type { ErrorFallbackProps } from './AppErrorBoundary';