No one ever notices it, I need to move it
Accidentally clicked & discovered that this light bubble can change color theme to dark mode. nostr:npub1jlrs53pkdfjnts29kveljul2sm0actt6n8dxrrzqcersttvcuv3qdjynqn It was so invisible or maybe I'm blind.

Discussion
Maybe just move it to the left side of the logo (or maybe just to just below "settings" in the main list), put a button frame around it, and make it a toggle switch between a bright bulb and a dark bulb? 🤔
I really like the easily accessible button either way. Though I may not use it enough to justify having it on the top bar. Hard to say without experimenting and seeing what the users think.