Title bar remains white in dark theme

This does not look very nice. It should ideally be dark in dark theme (or follow whatever theme OS is in). See the explorer at the right for example.
You have to fix that one in the Windows registry yourself.
Computer\HKEY_CURRENT_USER\Software\Microsoft\Windows\DWM Add a 32-bit DWORD with the following name: AccentColorInactive You can then copy over your current AccentColor value
That's not the same thing. I'm not asking for Psst to follow the accent color - it already follows that if you enable this Windows setting:

I'm saying that it should have a darker titlebar in dark theme, regardless of this setting. This is purely something that the apps control, Windows does not interfere in this.
But yes, after opening the issue I realized this is something that should be fixed in Druid upstream.