Switch to night theme based on prefers-color-scheme?

[Ambient-Impact]

I know that in #114 it was mentioned that setting prefers-color-scheme was not possible, but presumably it's available the other way around, like it is for web pages? It would be awesome if we could switch to the night theme based on that (could be a checkbox to enable this behaviour, so people could still use the time of day, etc. if they wanted). Sometimes I need to use a dark theme when it's still daylight outside.

[Tnings]

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