[Enhancement] Copy link button or text

[Loedje]

What problem is solved by the new feature

I knew you could copy the room code link, but I couldn't find it until I saw that you can click the QR code. This may also be confusing to other users.

Describe the feature
A copy link button with an icon or a text that says "Click here to copy room code link"

Edit: I just saw that you think the dialogue might become too bloated. I think a better solution could be to make the room code look like a clickable link, and that copies the room code.