Fix #7519: Hide depth attribute in Item Mode for elements with material layer sets

When editing representation items for elements with IfcMaterialLayerSetUsage
(LAYER2/LAYER3), the depth attribute is now hidden from the UI as it should
not be modified at the item level for these parametric elements.

The check is performed by accessing the parent element through the
representation_obj property in geometry props and checking its material
usage type.

src/bonsai/bonsai/bim/module/model/workspace.py

@@ -399,6 +399,16 @@ class EditItemUI:
         assert obj
 
         mesh_props = tool.Geometry.get_mesh_props(obj.data)
+        
+        # Get the parent element from representation_obj to check for layer set usage
+        has_layer_set_usage = False
+        props = tool.Geometry.get_geometry_props()
+        if props.representation_obj:
+            parent_element = tool.Ifc.get_entity(props.representation_obj)
+            if parent_element:
+                material_usage = tool.Model.get_usage_type(parent_element)
+                has_layer_set_usage = material_usage in ("LAYER2", "LAYER3")
+        
         if AuthoringData.data["is_representation_item_swept_solid"]:
             # TODO: support EndSweptArea for IfcRevolvedAreaSolidTapered,
             # will need to add second attribute for this.
@@ -412,8 +422,12 @@ class EditItemUI:
                 op.profile_id = int(mesh_props.item_profile)
 
         for item_attribute in mesh_props.item_attributes:
+            # Skip depth attribute for objects with layer set usage
+            if has_layer_set_usage and item_attribute.name.lower() == "depth":
+                continue
             row = cls.layout.row()
             draw_attribute(item_attribute, cls.layout)
+            
         if len(mesh_props.item_attributes) or AuthoringData.data["is_representation_item_swept_solid"]:
             row = cls.layout.row()
             row.operator("bim.update_item_attributes", icon="FILE_REFRESH", text="")