This commit updates the `CustomErrorComponent` in `pages/_error.js` to include additional error handling logic based on the error type or status code. It also captures errors with Sentry for improved error reporting.

Specific changes include:
- Added handling for 404 errors with custom message
- Added try-catch block to `getInitialProps` to catch and report errors with Sentry
- Updated comments for clarity

Note: This implementation assumes the use of `@sentry/nextjs` version 7.3.0 or higher.

Refactor UserDetails component for better readability and maintainability

Destructured user prop in function argument
Used nullish coalescing operator for avatar and handle props
Moved useFragment query to its own constant and reformatted for better readability
Renamed Props type to UserDetailsProps
Extracted GitStats component from UserDetails
Added aria-label to icon elements for accessibility
Reformatted code for consistent indentation and spacing

…d-reporting