My Mac switches between light and dark mode automatically at sunup and sundown, and this is the only app I can think of that doesn't follow along.

You've already got light and dark modes, so please just add an "auto" mode that switches between the two.

I'd like the same for the header bar, although something like this would also do the trick, since I don't care about the traffic lights.
Edit: I just realized (after sundown) that the header is actually the only thing that does follow system theme.