Copy button on code blocks with "copied" state for 5 minutes

Users need an intuitive way to copy values from code blocks or data in documentation, with a clear visual confirmation that the value was successfully copied.

Currently, when using multi-code block copy functionality, the confirmation appears at the bottom of the browser and doesn’t persist.

This creates confusion when copying large sets of values, as there’s no clear indicator of progress or whether a specific value was already copied.

The requested improvement is to add a copy button directly on each code block, where clicking it changes the label from "Copy" → "Copied!".

The "Copied!" state should persist for 5 minutes before reverting to "Copy."