Add shared WebUI layout primitives

webui/src/features/dashboard/DashboardPage.tsx

@@ -1,3 +1,4 @@
+import ContentGrid from "../../components/ContentGrid";
 import Card from "../../components/Card";
 import MetricCard from "../../components/MetricCard";
 import PageLayout from "../../components/PageLayout";
@@ -17,7 +18,7 @@ export default function DashboardPage() {
         <MetricCard label="Dashboard module" value="not installed" tone="neutral" detail="Core fallback is active." />
       </div>
 
-      <div className="dashboard-grid">
+      <ContentGrid columns={2} collapseAt="workspace" className="">
         <Card title="i18n:govoplan-core.installed_modules.32b3e799">
           {modules.length === 0 ? <p className="muted">i18n:govoplan-core.no_feature_modules_are_active.e9c2d936</p> :
           <dl className="detail-list">
@@ -33,7 +34,7 @@ export default function DashboardPage() {
         <Card title="Home">
           <p className="muted">This minimal core home is only shown while no dashboard WebUI module is available. Feature modules own their pages and can expose dashboard widgets once the dashboard module is installed.</p>
         </Card>
-      </div>
+      </ContentGrid>
     </PageLayout>);
 
 }