Adopt shared WebUI layout primitives

webui/src/features/dashboard/DashboardPage.tsx

@@ -1,3 +1,4 @@
+import { MetricGrid } from "@govoplan/core-webui";
 import {
   useEffect,
   useMemo,
@@ -491,7 +492,7 @@ export default function DashboardPage({
       }
     >
 
-        <div className="metric-grid dashboard-summary-grid">
+        <MetricGrid className="dashboard-summary-metrics">
           <MetricCard
             label="Active interface modules"
             value={modules.length}
@@ -516,7 +517,7 @@ export default function DashboardPage({
             tone="neutral"
             detail={layoutSourceLabel(layoutSource)}
           />
-        </div>
+        </MetricGrid>
 
         <LoadingFrame loading={loading} label="Loading Dashboard layout">
           {configuring ? (