FR: Loading animation

[NWYLZW]

So empty!

[exoticknight]

maybe put some example code

[NWYLZW]

maybe put some example code

This state is that monaco is being loaded, so a loading state is needed for it. I wrote it before, but now there are some problems.
But judging from my latest code, I will also have a guide to give the user if all its tabs are closed.