Dynamic wallpaper i.e. Custom backgrounds for light and dark mode

[bennypowers]

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Is your feature request related to a problem? Please describe.
When setting a custom background (either globally or per-user), it's not possible to set different backgrounds for light and dark mode, this can lead to contrast and theming issues.

Describe the solution you'd like
Users should be able to set two different custom background images - one for light mode and one for dark mode

Describe alternatives you've considered
Custom user CSS would allow users to set --image-background css variable using a prefers-color-scheme media query.

[meepuru]

I have similar problem, when using custom background image, the image lightness auto detection may be unreasonable.

Version: Nextcloud Hub 9 (30.0.4)

I think adding an option to manually select the brightness of the icons would be a good solution.

[bennypowers]

ICON brightness could solve the readability issue, but it wouldn't help the theming problem

E. G. Let's say you wanted to use an image of a beach at noonday sun for light mode, and a sunset for dark mode

[meepuru]

Sorry, there is a misunderstanding in my understanding. I am trying to avoid raising duplicate issues.

[bennypowers]

no worries, i'm glad you commented, it helped me clarify my original description