Exclude meshes without selected vertices from transforms and selection center in vertex/edge mode

[nklbdev]

Problem: When two meshes are selected, but vertices/edges are only selected on one of them, the other mesh still participates in Move, Rotate, and Resize operations — either by moving its entire position (global space) or all of its vertices (local space). The selection center also includes the unselected mesh, shifting the transform gizmo to an incorrect pivot.

Fix: In vertex and edge selection modes, Mesh and SplineMesh elements with no selected vertices are now skipped during all transform operations. The same guard is applied consistently across six locations:

Function	File	Operation
moveElementsInSpace	transform.js	Move (gizmo + sliders)
resizeOnAxis	transform.js	Resize (sliders)
onMove (resize_tool)	edit_transform.js	Resize (gizmo)
rotateOnAxis	transform.js	Rotate (gizmo)
rotateSelected	transform.js	Rotate (action/keybind)
getSelectionCenter	transform.js	Transform gizmo pivot

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