Figma meets Visual Studio Code: Collaboratively navigate, debug and edit your codebase on an infinite canvas https://www.getspectral.io/

promising but early. Tip for surviving the demo with mouse: you can fake panning by Ctrl+wheel: zoom out around one point, zoom in around another. I loved the "drag whole sub-tree" by holding Ctrl mechanic. I think I'd want a better automatic layout (less overlap), but ultimately for me, the reason to use something like this would be the freedom to lay out things manually — in a way that makes sense to me — and the sub-tree mechanic makes that more plausible...

Looks somewhat like Code Bubbles (https://cs.brown.edu/~spr/codebubbles/) which in turn inspired Debugger Canvas (https://marketplace.visualstudio.com/items?itemName=DebuggerCanvasTeam.DebuggerCanvas)