[UI] Automatic theme switching

Hey mroche, thanks for reaching out.

I've added you to the internal issue we have filed for this. I've also passed your findings along to our developers in case this helps at all.

It would be really great to finally have this functional for those of us who prefer to switch between themes during day-to-night and night-to-day transitions

Thanks for sharing your use case here, I can certainly see how matching system themes would be important in this instance.

Let me know if you have any questions!

Ali

ref: dev/core/core#22281