experimental manual control node - x/y grid

[exdysa]

https://airbnb.io/visx/drag-i <- this dot
https://airbnb.io/visx/xychart <- on this background and similarly shaded
https://airbnb.io/visx/tooltip <- with this coordinate return function, but transposed for a user-specified range

assignable coordinate axis, cyberpunk style, "feels" like a membrane, room for z-axis enhancements