refactor(plugins): move rescan button to page header, remove redundant title

Use usePageHeader().setEnd to place the rescan button in the shared
header bar. Remove the inline H2 title (already shown by the header)
and the wrapper div.

web/src/pages/PluginsPage.tsx

@@ -10,7 +10,6 @@ import { Select, SelectOption } from "@nous-research/ui/ui/components/select";
 import { Switch } from "@nous-research/ui/ui/components/switch";
 import { Spinner } from "@nous-research/ui/ui/components/spinner";
 import { CommandBlock } from "@nous-research/ui/ui/components/command-block";
-import { H2 } from "@/components/NouiTypography";
 import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
 import { Input } from "@/components/ui/input";
 import { Label } from "@/components/ui/label";
@@ -19,6 +18,7 @@ import { Toast } from "@/components/Toast";
 import { useI18n } from "@/i18n";
 import { PluginSlot } from "@/plugins";
 import { cn } from "@/lib/utils";
+import { usePageHeader } from "@/contexts/usePageHeader";
 
 /** Select value for built-in memory (`config` uses empty string). Never use `""` — UI Select maps empty value to an empty label. */
 const MEMORY_PROVIDER_BUILTIN = "__hermes_memory_builtin__";
@@ -38,6 +38,7 @@ export default function PluginsPage() {
 
   const { toast, showToast } = useToast();
   const { t } = useI18n();
+  const { setEnd } = usePageHeader();
 
   const loadHub = useCallback(() => {
     return api
@@ -56,6 +57,22 @@ export default function PluginsPage() {
     void loadHub().finally(() => setLoading(false));
   }, [loadHub]);
 
+  useEffect(() => {
+    setEnd(
+      <Button
+        ghost
+        size="sm"
+        className="shrink-0 gap-2"
+        disabled={loading || rescanBusy}
+        onClick={() => void onRescan()}
+      >
+        {rescanBusy ? <Spinner /> : <RefreshCw className="h-3.5 w-3.5" />}
+        {t.pluginsPage.refreshDashboard}
+      </Button>,
+    );
+    return () => setEnd(null);
+  }, [loading, rescanBusy, setEnd, t.pluginsPage.refreshDashboard]);
+
   const onInstall = async () => {
     const id = installId.trim();
     if (!id) {
@@ -136,32 +153,6 @@ export default function PluginsPage() {
 
       <div className={cn("flex w-full flex-col gap-8")}>
 
-
-        <div className="flex flex-wrap items-start justify-between gap-4">
-
-          <div>
-
-
-            <H2>{t.app.nav.plugins}</H2>
-
-
-            <p className="mt-1 max-w-xl text-[0.75rem] tracking-[0.06em] text-midground/55 normal-case">
-              {t.pluginsPage.headline}
-            </p>
-          </div>
-
-          <Button
-            ghost
-            size="sm"
-            className="shrink-0 gap-2"
-            disabled={loading || rescanBusy}
-            onClick={() => void onRescan()}
-          >
-            {rescanBusy ? <Spinner /> : <RefreshCw className="h-3.5 w-3.5" />}
-            {t.pluginsPage.refreshDashboard}
-          </Button>
-        </div>
-
         {providers && (
           <Card>
             <CardHeader>