fix(ui): align contextual documentation with headings

Verified with the coordinated workspace changes by devkit full run
2026-09-08T225814-186389-0000-3e3ed7cd (all seven phases passed).
This shared UI pass does not mark the individual module reviews complete.

tests/test_interface_documentation_contract.py

@@ -67,12 +67,13 @@ class DataflowInterfaceDocumentationContractTests(unittest.TestCase):
 
         for component in (
             "ActionBlockerHint",
-            "DocumentationHelpLink",
+            "titleHelp={<DocumentationHelpLink reference={DATAFLOW_DOCUMENTATION} />}",
             "useUnsavedDraftGuard",
             "ConfirmDialog",
         ):
             self.assertIn(component, page)
         self.assertIn("DATAFLOW_NODE_DOCUMENTATION", inspector)
+        self.assertNotIn("helpAction=", page)
 
 
 if __name__ == "__main__":