@techee has prof-gnome light and dark (at least he showed them both above) so how does prof-gnome svg dark look on windows?
I think it will be sufficient to have only one theme on Windows. In the macOS release I write `settings.ini` dynamically on launch based on user's desktop configuration and dark/light theme preference so Geany picks the color automatically. I think there's nothing like that in the Windows release and if someone wants to change the theme there, he'll have to dive into gtk theming anyway.