Move node color to just on the icon

[keyserj]

Is your feature request related to a problem? Please describe. There are a ton of colors in the diagram as more and more nodes get added, and it can be heavy on the eyes.

Describe the solution you'd like

Questions to answer

• Should we add a toggle to turn on/off?

Describe alternatives you've considered

Additional context

• Could also consider changing the variant on the Add Node buttons to use color mostly on the border and/or icon itself, rather than coloring the whole button

Technical ideas

[keyserj]

Could also try coloring the node's border, but that might require using per-node-type highlighting. Worth trying out probably