[gyx85542-dot]

Summary

• Viewport click and marquee selection now include primitives that belong to a group.
• Agent scenes parent visible meshes under groups that have no geometry, so the previous parentId filter made those models impossible to select except from the object list.
• Clicking a grouped part selects that part. A regression test covers a mesh parented under a group whose transform is not identity.

Test plan

• pnpm exec vitest run src/engine/interact/__tests__/pickerGroupedPrimitive.test.ts in editor/packages/builder
• Rebuilt @topview/3d-builder and clicked a grouped primitive in Studio; the inspector selected that node and showed the gizmo
• Click a grouped model and box-select several grouped parts in another agent scene