✨ Support any mouse button as trigger key

[MrKai77]

Discussed in #686

^{Originally posted by RUDANTU February 9, 2025}
I am using bettermouse, which occupies most of my mousekeys, I'd love to set eg. Mouse Button 5 to trigger Loop.

The app is so polished and lovely to use that I had to put in this feedback, instead of going back to Rectangle or whatever. ❤️