📎 Reduce the flickering in dark mode

[sugar-cat7]

No description provided.

[sruenwg]

If this issue is referring to the behaviour seen in this clip:

spodule-dark-mode-ssr-flicker-1.mov

then I believe the problem is that the SSRed page always contains light mode styles, with dark mode styles only being applied once JS is run on the client.

MUI seems to solve this by making use of CSS variables.
Although the feature is marked as experimental, it might be worth trying out since it looks fairly well documented with a how-to guide for fixing our very problem.

[sugar-cat7]

Sounds good. Let's try CSS theme variables.