Adds a top-loading progress bar that appears during page transitions to improve user experience by providing visual feedback during navigation.
- Integrated the `nextjs-toploader` package, a lightweight and efficient solution for Next.js applications.
- The progress bar is initialized in the main `_app.tsx` file to ensure it's active across the entire application.
- This feature works seamlessly with the Next.js App Router and does not interfere with server-side rendering (SSR).
