Describe the solution you'd like

Right now, the theme is 'Light' for all users on all systems. Since Dark Theme has become commonplace on Mac OS, Linux and Windows 11, I think it would be time to change the default to 'System'.

Describe alternatives you've considered

A first-time greeter asking the user what to do would also be nice, but more work.

Additional context

It has been a long time coming, but this can be the new default.