Sidebar overlap on scroll

[LuisDev912]

When navigating the issues page, the <aside> element overlaps the main content (issue cards) while scrolling.

This affects usability, as it prevents users from fully viewing and interacting with the content.

Steps to reproduce:

1. Open the issues page
2. Scroll down
3. Observe how the sidebar remains fixed and overlaps the cards

Expected behaviour:

The sidebar should not interfere with the main content and should adapt properly to different screen sizes.

Possible cause:

This might be related to a fixed or sticky positioning of the <aside> element without proper responsive handling.

Suggested solution:

• Add responsive behaviour for smaller screens (e.g., stacking layout or disabling fixed positioning)

Impact

This impacts usability and accessibility, as content becomes partially hidden and harder to interact with.

I'd be happy to work on a PR to fix this if it sounds good.