clicking the copy-url extension icon to copy the URL

[0xRichardH]

Closes: #2493

• Added support for copying the current tab's URL when the extension icon is clicked
• Modified notifications to auto-close after 4 seconds, preventing them from lingering indefinitely

[dhh]

Getting this error when I click the icon:

[0xRichardH]

The error occurs because the extension tries to access chrome:// URLs, which Chrome extensions cannot access for security reasons.

This change introduces a check to prevent the extension from attempting to copy these restricted URLs.