[Feature] Global Error Handling Implementation

[omimouni]

Is there an existing issue for this feature?

• Yes, I have searched the existing issues and it doesn't exist.

Feature Description

Current Behavior:
The app currently uses React Router's default error boundary.

Proposed Solution:
Add a custom error page to show friendly messages when something goes wrong.

Technical Details:

• Use React Router’s useRouteError to get error details.
• Create an ErrorPage component.
• Show useful error messages based on status codes.
• Add a button to help users go back or retry.