Calling on all plugins to use a unified preference key to set theme colors.

[volatile-static]

I am the owner of the plugin Chartero, which has a separate iframe window. When the user needs to switch themes, they have to click two buttons(one for night and the other for Chartero), which is very inconvenient. I hope that users can change the entire interface, including all plug-in windows, by clicking a single button.
I think my plugin could use the following command to listen the switch event and change theme of itself:

Zotero.Prefs.registerObserver('night.current_theme', () => iframe.contentWindow.postMessage('switch theme');

If this is feasible, I hope other plugins can also use this option. Looking forward to hearing your suggestions on this.