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/components/admin/studio/studio-page.tsx

@@ -0,0 +1,37 @@
+import type { LucideIcon } from "lucide-react";
+import type { ReactNode } from "react";
+import { AdminPageShell } from "@/components/admin/admin-page-shell";
+
+interface StudioPageProps {
+	icon?: LucideIcon;
+	title: string;
+	subtitle?: string;
+	actions?: ReactNode;
+	children: ReactNode;
+}
+
+/**
+ * Consistent chrome for Catalog Studio sub-pages: the shared admin page
+ * header (icon tile, title, subtitle, optional actions) with the studio's
+ * standard padding, so every tool page lines up the same way.
+ */
+export function StudioPage({
+	icon,
+	title,
+	subtitle,
+	actions,
+	children,
+}: StudioPageProps) {
+	return (
+		<div className="p-3 sm:p-4">
+			<AdminPageShell
+				icon={icon}
+				title={title}
+				subtitle={subtitle}
+				actions={actions}
+			>
+				{children}
+			</AdminPageShell>
+		</div>
+	);
+}