Toggle to hide all connections except for selected nodes

I think spaghetti actually doesn't matter in this kind of workflow. What you care about is always local, i.e. immediately relevant incoming and outgoing data. As such if we forget about the connections we can focus more on placing nodes such as to create a pleasant UI to tweak and play around rather than placing nodes such as to make the connections not too chaotic. There should be a keyboard shortcut as well to toggle it.