Bonsai: make 'has openings' representation error actionable (#8108)

When converting a wall representation to a parametric extrusion via the
Representation Utilities buttons, an element that has openings would report
"has openings - representation cannot be updated" and stop, without telling
the user there is an ALT+click path that bakes the openings into the new
representation. Point the message at that path so the error is actionable.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
(cherry picked from commit 25441bd816)

src/bonsai/bonsai/bim/module/geometry/operator.py

@@ -581,7 +581,11 @@ class UpdateRepresentation(bpy.types.Operator, tool.Ifc.Operator):
         if has_openings and not self.apply_openings:
             # Meshlike things with openings can only be updated without openings applied.
             if self.from_ui:
-                self.report({"ERROR"}, f"Object '{obj.name}' has openings - representation cannot be updated.")
+                self.report(
+                    {"ERROR"},
+                    f"Object '{obj.name}' has openings. "
+                    "ALT+click the button to bake the openings into the new representation.",
+                )
             return
 
         if product.is_a("IfcGridAxis"):