Implement dark mode for window title frame on Windows and Linux

[Perverance]

Description

Hi all! I'm not sure if this is the right place. In short, I'd like to see an option to change the windows title frame color to a dark or custom one.

As far I know, themes cannot change the default white color of the window title, it seems to be the only element which color cannot be changed. I'd like to have an option to change it to match the OS dark mode, but I'm not sure how hard could it be to implement it.

Thank you! <3

Current Behavior

I don't find this option, the

Your Environment

• Processing version: 4.2
• Operating System and OS version: Windows 11