feat(studio): localize catalog studio UI and polish responsive layout

Route all Catalog Studio strings through the admin.studio namespace
(workspace, filters, review, inspector, quality, sync, scale32, organize
imports and page titles/subtitles) with English fallback, and add shared
StudioPage chrome plus a loading skeleton. Tighten mobile padding on the
header and sub-bars.

src/app/admin/studio/nitro-cleanup/page.tsx

@@ -1,5 +1,8 @@
+import { FileX2 } from "lucide-react";
 import { redirect } from "next/navigation";
+import { getTranslations } from "next-intl/server";
 import { NitroCleanupPanel } from "@/components/admin/studio/nitro-cleanup-panel";
+import { StudioPage } from "@/components/admin/studio/studio-page";
 import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
 
 export default async function StudioNitroCleanupPage() {
@@ -7,16 +10,14 @@ export default async function StudioNitroCleanupPage() {
 	if (!canAccess(permissions, PERMS.ASSETS_IMPORT, session.user.rank)) {
 		redirect("/admin");
 	}
+	const t = await getTranslations("admin.studio");
 	return (
-		<div className="space-y-6 p-4">
-			<div>
-				<h1 className="text-2xl font-bold tracking-tight">Nitro cleanup</h1>
-				<p className="mt-1 text-muted-foreground">
-					Scan the nitro directories for fake bundles (no matching furniture)
-					and broken bundles (unparseable) and remove them.
-				</p>
-			</div>
+		<StudioPage
+			icon={FileX2}
+			title={t("nav.nitroCleanup")}
+			subtitle={t("pages.nitroCleanupSubtitle")}
+		>
 			<NitroCleanupPanel />
-		</div>
+		</StudioPage>
 	);
 }