feat: add reusable widget error boundary

[akshaya988]

Summary

Added a reusable WidgetErrorBoundary component and wrapped each dashboard widget individually to prevent the entire dashboard from crashing if a single widget fails.

Closes #164

Type of Change

• Bug fix
• New feature
• Documentation update
• Refactor / code cleanup

Changes Made

• Created reusable WidgetErrorBoundary.tsx
• Wrapped dashboard widgets individually using error boundaries
• Added fallback error UI for failed widgets
• Added retry functionality to recover widgets
• Added console.error logging for debugging
• Prevented full dashboard crashes caused by widget failures
• Created DashboardWidgets.tsx client wrapper component

How to Test

1. Run the project using npm run dev
2. Add throw new Error("Test widget crash"); inside any widget component
3. Open /dashboard
4. Verify only the broken widget shows fallback UI
5. Verify other widgets continue functioning normally
6. Click retry button to test recovery behavior

Screenshots (if UI change)

Add screenshots of:(No need)

• Widget fallback UI
• Dashboard still functioning while one widget crashes

Checklist

• Linked issue in summary
• npm run lint passes locally
• No TypeScript errors (npm run type-check)
• Self-reviewed the diff
• Added/updated tests if applicable

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