fix(ui): centralize contextual help and navigation presentation

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.

webui/src/features/notifications/NotificationSummaryWidget.tsx

@@ -2,7 +2,6 @@ import { MetricGrid } from "@govoplan/core-webui";
 import { Link } from "react-router";
 import {
   DismissibleAlert,
-  DocumentationHelpLink,
   LoadingFrame,
   MetricCard,
   adminErrorMessage,
@@ -11,7 +10,6 @@ import {
   type DashboardWidgetConfiguration,
   useSharedNotificationSummary
 } from "@govoplan/core-webui";
-import { NOTIFICATIONS_DOCUMENTATION } from "./interfacePatterns";
 
 export default function NotificationSummaryWidget({
   settings,
@@ -66,7 +64,6 @@ export default function NotificationSummaryWidget({
         )}
       </MetricGrid>
       <div className="notifications-widget-actions">
-        <DocumentationHelpLink reference={NOTIFICATIONS_DOCUMENTATION} />
         {showCenterLink && (
           <Link className="btn btn-secondary" to="/notifications">
             i18n:govoplan-notifications.open_center