Use light or dark theme based on current OS colour scheme

[StrangePeanut]

Context

No response

Description

Introduce a new default 'Sync with OS' theme option that automatically uses the light or dark theme based on the current OS colour scheme. Users can override the behaviour by explicitly selecting a theme option.

This improves the overall user experience for those who regularly switch between the light and dark colour schemes. It also benefits new users who use the dark colour scheme around the clock as they no longer need to change the theme setting from default.

Mumble component

Client

OS-specific?

No

Additional information

No response

[Hartmnt]

Sounds like a good idea. Should be reasonably easy to implement once Mumble switches to Qt 6.5 https://stackoverflow.com/a/77751363