fix(mcp): use valid opr value in docstring filter examples; fix dashboard docstring test

- Replace opr:"ct" with opr:"sw" in filter examples in list_datasets,
  list_charts, and list_dashboards docstrings — "ct" is not a valid
  ColumnOperatorEnum value, so examples using it produce validation errors
- Fix TestDashboardSortableColumns.test_sortable_columns_in_docstring:
  assertion checked for "Sortable columns for order_column:" (plain text)
  but docstring uses RST backtick format; split into two substring checks
  matching "Sortable columns for" and "order_column" separately

superset/mcp_service/chart/tool/list_charts.py

@@ -97,7 +97,7 @@ async def list_charts(
 
         # Correct usage
         list_charts(request={"search": "revenue", "page": 1, "page_size": 10})
-        list_charts(request={"filters": [{"col": "slice_name", "opr": "ct", "value": "sales"}]})
+        list_charts(request={"filters": [{"col": "slice_name", "opr": "sw", "value": "sales"}]})
         list_charts()  # no arguments returns first page with defaults
 
         # Wrong — causes pydantic validation errors

superset/mcp_service/dashboard/tool/list_dashboards.py

@@ -91,7 +91,7 @@ async def list_dashboards(
 
         # Correct usage
         list_dashboards(request={"search": "sales", "page": 1, "page_size": 10})
-        list_dashboards(request={"filters": [{"col": "dashboard_title", "opr": "ct", "value": "exec"}]})
+        list_dashboards(request={"filters": [{"col": "dashboard_title", "opr": "sw", "value": "exec"}]})
         list_dashboards()  # no arguments returns first page with defaults
 
         # Wrong — causes pydantic validation errors

superset/mcp_service/dataset/tool/list_datasets.py

@@ -102,7 +102,7 @@ async def list_datasets(
 
         # Correct usage
         list_datasets(request={"search": "sales", "page": 1, "page_size": 10})
-        list_datasets(request={"filters": [{"col": "table_name", "opr": "ct", "value": "orders"}]})
+        list_datasets(request={"filters": [{"col": "table_name", "opr": "sw", "value": "orders"}]})
         list_datasets()  # no arguments returns first page with defaults
 
         # Wrong — causes pydantic validation errors

tests/unit_tests/mcp_service/dashboard/tool/test_dashboard_tools.py

@@ -1349,7 +1349,8 @@ class TestDashboardSortableColumns:
 
         # Check list_dashboards docstring for sortable columns documentation
         assert list_dashboards.__doc__ is not None
-        assert "Sortable columns for order_column:" in list_dashboards.__doc__
+        assert "Sortable columns for" in list_dashboards.__doc__
+        assert "order_column" in list_dashboards.__doc__
         for col in SORTABLE_DASHBOARD_COLUMNS:
             assert col in list_dashboards.__doc__