Implement error boundaries and loading states

[yashdev9274]

Description

Add proper error handling across the Next.js application with error boundaries and loading states.

Expected Deliverables

• Create ErrorBoundary component
• Add not-found.tsx pages where missing
• Implement Suspense with loading.tsx skeletons
• Add global error.tsx handler
• Create toast notification system for error messages

Areas to Consider

• Different error UIs for different error types
• Error logging service integration
• User-friendly error messages

[coderabbitai]

🔗 Related PRs

#2 - update dashboard layout [merged]

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