Keep viewport hover and click picking while a 3D mouse moves the view (#1781)

Thanks @oursland.

docs/step-import.md

@@ -17,9 +17,11 @@ camera moves. Large assemblies keep their tree open without resolving every part
 folder again on each frame. Geometry edits, assembly changes and uncaptured or reverted
 positions refresh those queries; selection, visibility and locking are read live.
 
-Hover picking pauses while the mouse or a 3D mouse moves the view and resumes when
-navigation stops. Picking uses the cached body bounds directly in model order, so
-finding each body's bounds does not scan the assembly again.
+Hover picking pauses while the mouse moves the view and resumes when navigation stops.
+A 3D mouse moving the view leaves it on: the pointer hand is free, so preselection and
+clicks keep working while the other hand turns the view. Picking uses the cached body
+bounds directly in model order, so finding each body's bounds does not scan the assembly
+again.
 
 Hovering an assembly's Browser row retains its whole-body highlight buffers during
 rotation, panning and zoom; the GPU transforms those buffers with the camera. The