fix(ui): move widget and page documentation into 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_manifest.py

@@ -1,12 +1,23 @@
 from __future__ import annotations
 
 import unittest
+from pathlib import Path
 
 from govoplan_core.core.modules import ModuleManifest
 from govoplan_scheduling.backend.manifest import get_manifest
 
 
 class SchedulingManifestTests(unittest.TestCase):
+    def test_widget_documentation_is_contributed_for_its_dashboard_title(self) -> None:
+        root = Path(__file__).resolve().parents[1]
+        contribution = (root / "webui/src/module.ts").read_text(encoding="utf-8")
+        widget = (root / "webui/src/features/scheduling/SchedulingRequestsWidget.tsx").read_text(encoding="utf-8")
+        self.assertIn(
+            'documentation: { topicId: "scheduling.find-and-decide-meeting-time", documentationType: "user" }',
+            contribution,
+        )
+        self.assertNotIn("DocumentationHelpLink", widget)
+
     def test_all_static_topics_have_complete_german_content(self) -> None:
         manifest = get_manifest()
         for topic in manifest.documentation: