Add snap option to gizmos (Ctrl/Cmd+drag)#993
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Rotate snaps to 5° increments, translate to 0.1 units, scale to 0.1 ratio when holding Ctrl (Cmd on macOS). Applies to node, cropbox, and ellipsoid gizmos. Closes MrNeRF#746
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Summary
Details
Introduces a computeSnapPtr() helper that returns snap values based on the active gizmo operation
when Ctrl is held, or nullptr otherwise. Applied to all three ImGuizmo::Manipulate call sites in
GizmoManager (node gizmo, standard gizmo, and the third gizmo path).
Closes #746