[Feature] - Light mode vs dark mode

[matthew-carroll]

I'm writing goldens for graph_paper. I want to sample the various configurations in light mode and dark mode. I quickly discovered that we've only thought about light mode.

To even attempt to darken the whole Scene, I had to copy and adjust the item scaffold and the item decorator. Even then, there's no way to control the background or the font color for the label below a golden.

Here's the closest I could get:

This reveals two things:

• It takes too much intervention to change colors from light to dark
• There are some things that are currently impossible to control