Change Repeat Node Direction with manual pivot placement/manipulation in the viewport

Right now the placement of Repeat Direction is possible only through typing specific values in the fields. It would be much more intuitive to set it in the viewport by dragging a dedicated pivot gizmo that also could be autosnapped to other objects.

Start by locating the Repeat Direction node and the viewport interaction code that handles node controls. Review how its direction is currently set through fields and identify the relevant viewport and snapping entry points. Done means a dedicated pivot gizmo can be dragged in the viewport and autosnapped to other objects.

Written by the indexing model from the issue text.