FediVerse handles should not be treated as email handles

### Your use case

#### What would you like to do?
If I receive a FediVerse handle like @name@server.tld it should be treated as is and not as E-Mail

#### Why would you like to do it?
Improve handling.

#### How would you like to achieve it?
Tab on the handle to open a dialog for sharing or open with a FediVerse-App

### Have you considered any alternatives?

_No response_

### Additional context

_No response_

### Are you willing to provide a PR?

Unfortunately, I'm not able to do so.