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/maintenance/page.tsx

@@ -1,7 +1,9 @@
+import { Wrench } from "lucide-react";
 import { redirect } from "next/navigation";
 import { getTranslations } from "next-intl/server";
 import { CatalogIntegrityPanel } from "@/components/admin/catalog/catalog-integrity-panel";
 import { CatalogMaintenancePanel } from "@/components/admin/catalog/catalog-maintenance-panel";
+import { StudioPage } from "@/components/admin/studio/studio-page";
 import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
 
 export default async function StudioCatalogMaintenancePage() {
@@ -16,20 +18,27 @@ export default async function StudioCatalogMaintenancePage() {
 		session.user.rank,
 	);
 	const t = await getTranslations("pages.admin.catalog.integrity");
+	const studioT = await getTranslations("admin.studio");
 	return (
-		<div className="min-h-0 space-y-6">
-			<CatalogIntegrityPanel canRepair={canRepair} />
-			{canRepair && (
-				<details className="rounded-xl border p-4">
-					<summary className="cursor-pointer font-medium">
-						{t("legacyTitle")}
-					</summary>
-					<p className="mt-3 text-sm text-muted-foreground">
-						{t("legacyHint")}
-					</p>
-					<CatalogMaintenancePanel />
-				</details>
-			)}
-		</div>
+		<StudioPage
+			icon={Wrench}
+			title={studioT("nav.catalogMaintenance")}
+			subtitle={studioT("pages.maintenanceSubtitle")}
+		>
+			<div className="min-h-0 space-y-6">
+				<CatalogIntegrityPanel canRepair={canRepair} />
+				{canRepair && (
+					<details className="rounded-xl border p-4">
+						<summary className="cursor-pointer font-medium">
+							{t("legacyTitle")}
+						</summary>
+						<p className="mt-3 text-sm text-muted-foreground">
+							{t("legacyHint")}
+						</p>
+						<CatalogMaintenancePanel />
+					</details>
+				)}
+			</div>
+		</StudioPage>
 	);
 }