Feature -
Add Scroll-to-Top Button

Description
This PR adds a Scroll-to-Top button that appears when the user scrolls down the page. Clicking the button smoothly scrolls the view back to the top.

Why This is Useful -
Improves navigation on pages with long content

Enhances user experience and accessibility

Reduces the need for manual scrolling

Implementation Details -

Button becomes visible after scrolling past a certain threshold

Smooth scrolling for better usability

Placed unobtrusively in the bottom-right corner

Testing -
Verified visibility based on scroll position

Confirmed proper functionality across different screen sizes.

@choo121600 can you please review it .