bug: desktop contact button is a dead click

- On desktop clicking the contact button does nothing. To improve UX, have it copy the email and push a toast to notify the user that the email address has been copied to their clipboard.

<img width="712" height="260" alt="Image" src="https://github.com/user-attachments/assets/499d684f-bb7f-488e-a150-94e5acc07768" />
