fix: Update app.py

app.py

@@ -72,7 +72,7 @@ def export_geometry(geometry, file_format='obj'):
     output_path = tempfile.mktemp(suffix=supported_formats[file_format.lower()])
     
     # Create a copy of the geometry to avoid modifying the original
-    geometry_copy = geometry.clone()
+    geometry_copy = geometry
     
     # Apply rotation
     rot = np.eye(4)