feat: Add Error Boundary and Recovery UI

[nik-kale]

Summary

This PR adds a React Error Boundary component that gracefully catches runtime errors and provides users with a recovery UI instead of a blank screen. Improves user experience during unexpected failures with retry and reload options.

Changes

• Created ErrorBoundary component:
  • Catches React component errors
  • Displays friendly error message
  • Provides "Try Again" and "Reload Page" buttons
  • Shows error details for debugging
  • Component stack trace in development mode
• Integrated into application:
  • Wrapped App component in main.tsx
  • Protects entire application tree
• Professional error UI:
  • Animated error icon
  • Clean, modern design
  • Mobile responsive
  • Developer-friendly stack traces

Type of Change

• New feature
• Bug fix
• Breaking change
• Documentation update
• Reliability improvement

Features

Error Display

• ✅ Friendly user-facing message
• ✅ Error details (error message)
• ✅ Component stack trace (dev mode only)
• ✅ Professional UI design

Recovery Options

• ✅ Try Again: Resets error state, re-renders component
• ✅ Reload Page: Full page refresh
• ✅ Automatic error logging to console

User Experience

• ✅ No blank screen crashes
• ✅ Clear actionable options
• ✅ Professional appearance
• ✅ Mobile responsive design

Before vs After

Before

• Runtime error → Blank white screen
• No recovery options
• No error information
• Poor user experience

After

• Runtime error → Friendly error page
• Retry and reload buttons
• Error details visible
• Graceful degradation

Testing

• ✅ No linting errors
• ✅ ErrorBoundary wraps entire app
• ✅ Catches component errors
• ✅ Retry button resets state
• ✅ Reload button refreshes page
• ✅ Stack traces in development only

Checklist

• Code follows project style guidelines
• Self-review completed
• Professional UI design
• No new warnings introduced
• Mobile responsive
• Development mode debugging supported

Related Issues

Addresses Feature #10 from FEATURE_OPPORTUNITIES.md - Priority Score: 2.0

Notes

• Error boundary only catches errors in child components
• Does not catch errors in event handlers (use try/catch)
• Does not catch errors in async code
• Future: Integrate with error tracking service (Sentry, Rollbar)

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