[FEATURE]: Custom UI Font in Desktop/Web #11955

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

Similar to how you can set a custom monospace font for code blocks, I’d like to be able to use a custom font for "everything" else (UI) in the app, for example, right now in mac the default apple system font would be used.

In addition, I noticed when looking at the code that for the mono fonts, currently a hardcoded set of fonts is presented to the user, regardless of what's installed in the system, ideally it would allow to set any font available in the system.

I realize this might sound like a silly request. But, If you would be willing to take it, I would be happy to work on a PR for this. Thanks for all the great work.