Enhancement(#143): Add custom 404 page with navigation actions and re…

[BHUVANSH855]

✨ Custom 404 Page Implementation

🚀 What’s Added

• Dedicated custom 404 page using not-found.tsx
• Friendly error message
• "Go Back" button (router.back())
• "Return to Home" button
• Responsive layout
• Dark mode compatibility
• Smooth entrance animation

✅ Benefits

• Improved user experience
• Professional routing behavior
• Consistent theme with existing UI

Closes #143

[vercel]

@BHUVANSH855 is attempting to deploy a commit to the travellersmeet-project Team on Vercel.

A member of the Team first needs to authorize it.

[github-actions]

Thanks for opening this PR, @BHUVANSH855! 👋

Our maintainers will review it shortly. Estimate Time is 5-8 hrs .Meanwhile please:

• Ensure CI is green (lint, typecheck, build).
• Hit the star ⭐ button to show your support!
• Confirm the PR template checklist is complete.
• Add screenshots for UI changes.

If anything changes, feel free to push updates—this thread will stay open.

[BHUVANSH855]

Hi @singh-odyssey,

All changes are valid and can be merged.
Kindly consider this under ECWoC'26.