Jumbo "waiting for Opponent" messagebox that can't be moved is Ugly

Can you make it smaller or moveable?

This is better with the upcoming automatch system, though direct and open challenges still have that message box. It’s on the todo list, I just haven’t had time to deal with it. I’d happily merge a pull request if someone wants to submit a patch though: https://github.com/online-go/online-go.com/blob/devel/src/components/ChallengeModal/ChallengeModal.tsx#L415-L432 is the current code