Hide package name copy-button

Right now, the button often remains visible after clicking. It should disappear.

This looks like a browser bug, I'll describe it in more detail later

<img width="204" height="88" alt="Image" src="https://github.com/user-attachments/assets/737c3294-b86e-43b5-af30-e5ff65ecbbc1" />