use a mock comm to prevent type check errors

Author: melissa-barca

extensions/positron-python/python_files/posit/positron/variables.py

@@ -734,10 +734,25 @@ def _summarize_data(self, path: list[str]):
         if not _value_type_is_supported(value):
             raise ValueError(f"Variable at '{path}' is not supported for summary")
 
-        # Create a temporary table view without a comm
+        # Create a temporary table view with mock comm
         temp_state = DataExplorerState("temp_summary")
         try:
-            table_view = _get_table_view(value, None, temp_state, self.kernel.job_queue)
+
+            class _MockBaseComm:
+                def __init__(self):
+                    self.comm_id = "temp_summary_comm"
+
+                def send(self, data):
+                    pass  # No-op for temporary summary
+
+                def on_close(self, callback):
+                    pass  # No-op for temporary summary
+
+            from .positron_comm import PositronComm
+
+            mock_comm = PositronComm(_MockBaseComm())
+
+            table_view = _get_table_view(value, mock_comm, temp_state, self.kernel.job_queue)
         except Exception as e:
             raise ValueError(f"Failed to create table view: {e}") from e