Tolerate stale array child/parent GUIDs (#8177)

* Tolerate stale array child/parent GUIDs

A real-world IFC project (an arrayed door whose host got deleted
externally) crashed Bonsai's project load with "Instance with
GlobalId not found" inside setup_arrays.

tool.Blender.get_object_from_guid declared Optional return but let
RuntimeError propagate; callers iterating BBIM_Array child lists then
crashed instead of skipping. Honour the documented contract by
returning None on miss, matching the convention used by every other
by_guid lookup helper in tool/array.py, tool/ifc.py, tool/geometry.py.

Sweep the four user-action sites that resolve array child/parent
GUIDs without a guard - they shared the same bug class but were
reachable from different operators (regenerate_array, RegenerateArray
clear, duplicate_ifc_objects, process_arrays). An already-missing
entity is the desired terminal state for each, so the fix is
try/except RuntimeError: continue/skip.

setup_arrays now also collects each parent with at least one stale
child GUID into IfcImporter.broken_arrays, surfaced via a new Project
panel banner mirroring the existing pending_opening_recut UX. The
banner reports the count and offers "Select Elements" to navigate to
the affected array parents and a Dismiss button.

constrain_children_to_parent was being called once per layer inside
setup_arrays' for loop even though it always iterates all layers
internally - lifted out of the loop (pre-existing N x perf bug
that the stale-GUID print exposed).

Regression tests:
- test_returns_none_when_guid_not_in_file pins the get_object_from_guid
  Optional contract.
- test_remove_array_tolerates_stale_child_guid injects a fake child
  GUID into BBIM_Array.Data and asserts bim.remove_array completes
  cleanly.

Generated with the assistance of an AI coding tool.

* Black: wrap long bl_description in dismiss_pending_array_repair

Generated with the assistance of an AI coding tool.

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

@@ -1236,6 +1236,17 @@ class LoadProjectElements(bpy.types.Operator):
                 f"Apply manually from the Project panel.",
             )
 
+        props.pending_array_repair.clear()
+        if ifc_importer.broken_arrays:
+            for element in ifc_importer.broken_arrays:
+                item = props.pending_array_repair.add()
+                item.ifc_definition_id = element.id()
+            self.report(
+                {"WARNING"},
+                f"{len(ifc_importer.broken_arrays)} array parent(s) reference missing child GUIDs. "
+                f"Inspect from the Project panel.",
+            )
+
         tool.Project.load_default_thumbnails()
         tool.Project.set_default_context()
         tool.Project.set_default_modeling_dimensions()
@@ -3539,3 +3550,44 @@ class BIM_OT_select_pending_opening_cuts(bpy.types.Operator):
         tool.Blender.set_objects_selection(context, active_object=objects[0], selected_objects=objects)
         self.report({"INFO"}, f"Selected {len(objects)} element(s).")
         return {"FINISHED"}
+
+
+class BIM_OT_select_pending_array_repair(bpy.types.Operator):
+    bl_idname = "bim.select_pending_array_repair"
+    bl_label = "Select Array Parents With Missing Children"
+    bl_description = "Select the Blender objects of array parents whose BBIM_Array.Data references children that don't resolve in the file."
+    bl_options = {"REGISTER", "UNDO"}
+
+    def execute(self, context: bpy.types.Context) -> set[str]:
+        ifc_file = tool.Ifc.get()
+        if ifc_file is None:
+            self.report({"INFO"}, "No IFC file loaded.")
+            return {"CANCELLED"}
+        objects: list[bpy.types.Object] = []
+        for item in tool.Project.get_project_props().pending_array_repair:
+            try:
+                element = ifc_file.by_id(item.ifc_definition_id)
+            except RuntimeError:
+                continue
+            obj = tool.Ifc.get_object(element)
+            if obj is not None:
+                objects.append(obj)
+        if not objects:
+            self.report({"INFO"}, "No matching Blender objects found for the pending list.")
+            return {"CANCELLED"}
+        tool.Blender.set_objects_selection(context, active_object=objects[0], selected_objects=objects)
+        self.report({"INFO"}, f"Selected {len(objects)} array parent(s).")
+        return {"FINISHED"}
+
+
+class BIM_OT_dismiss_pending_array_repair(bpy.types.Operator):
+    bl_idname = "bim.dismiss_pending_array_repair"
+    bl_label = "Dismiss Pending Array Repair"
+    bl_description = (
+        "Clear the pending array-repair list without acting on it. The underlying BBIM_Array.Data stays unchanged."
+    )
+    bl_options = {"REGISTER", "UNDO"}
+
+    def execute(self, context: bpy.types.Context) -> set[str]:
+        tool.Project.get_project_props().pending_array_repair.clear()
+        return {"FINISHED"}