Invert black/white on transparent PNGs / SVGs in dark mode.

[cnf]

Is your feature request related to a problem? Please describe.
I have a lot of transparent images for categories and footprints. they are rather hard to see in dark mode.

example:

Describe the solution you'd like
I was thinking adding a "monochrome" or "invertable" flag to the asset if it is transparent, and all assets that have that flag apply the css filter invert() if you are in dark mode.

https://developer.mozilla.org/en-US/docs/Web/CSS/filter-function/invert

Alternatively, apply a background with an edge fade in or something to transparent images, so you get a nice background, and not a square blocky image.

This is mostly cosmetic, but I live in dark mode most of the time, and it would make a big difference for usability for me.

Thanks!