Fix shapely topology crash in boundary generation

Add buffer(0) validation for space_face_polygon and face_polygon
before intersection, following the same pattern as tool/cad.py.

Wrap the intersection in try/except for shapely.errors.GEOSException
to catch remaining topology errors. On exception, set
bonsai.last_error (so the 'Copy Error Message To Clipboard' button
appears in the UI), report an ERROR to the operator, and continue
processing other face pairs instead of crashing.

Generated with the assistance of an AI coding tool.

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

@@ -18,6 +18,7 @@
 
 import logging
 import multiprocessing
+import traceback
 from math import acos, degrees, inf, pi, radians
 from typing import Optional, Union
 
@@ -38,6 +39,7 @@ import shapely.ops
 from ifcopenshell.util.shape_builder import ShapeBuilder
 from mathutils import Matrix, Vector
 
+import bonsai
 import bonsai.bim.import_ifc as import_ifc
 import bonsai.core.attribute as core
 import bonsai.core.geometry
@@ -804,12 +806,26 @@ class AddBoundary(bpy.types.Operator, tool.Ifc.Operator):
                     space_face_polygon = shapely.Polygon(
                         [tuple((space_face_matrix_i @ v).xy) for v in space_face_verts]
                     )
+                    if not space_face_polygon.is_valid:
+                        space_face_polygon = space_face_polygon.buffer(0)
 
                     space_matrix_world_i = space_obj.matrix_world.inverted()
                     face_verts = [space_matrix_world_i @ building_obj.matrix_world @ v.co.copy() for v in face.verts]
                     face_polygon = shapely.Polygon([tuple((space_face_matrix_i @ v).xy) for v in face_verts])
+                    if not face_polygon.is_valid:
+                        face_polygon = face_polygon.buffer(0)
 
-                    gross_boundary_polygon = space_face_polygon.intersection(face_polygon)
+                    try:
+                        gross_boundary_polygon = space_face_polygon.intersection(face_polygon)
+                    except shapely.errors.GEOSException:
+                        bonsai.last_error = traceback.format_exc()
+                        element_name = building_element.Name or building_element.is_a()
+                        self.report(
+                            {"ERROR"},
+                            f"Skipping invalid geometry for {element_name} (shapely topology error). "
+                            "See 'Copy Error Message To Clipboard' for details.",
+                        )
+                        continue
 
                     if type(gross_boundary_polygon) == shapely.GeometryCollection:
                         for geom in gross_boundary_polygon.geoms: