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/loading.tsx

@@ -0,0 +1,30 @@
+import { Skeleton } from "@/components/ui/skeleton";
+
+/**
+ * Loading state for any Catalog Studio sub-page. Mirrors the StudioPage
+ * header (icon tile, title, subtitle) and a body block so navigation between
+ * studio tools shows a stable skeleton instead of a blank pause.
+ */
+export default function StudioLoading() {
+	return (
+		<div className="p-4">
+			<div className="space-y-5">
+				<div className="flex flex-wrap items-start justify-between gap-4">
+					<div className="flex min-w-0 items-center gap-3">
+						<Skeleton className="h-10 w-10 shrink-0 rounded-xl bg-[var(--admin-accent)]/10" />
+						<div className="min-w-0">
+							<Skeleton className="h-8 w-48" />
+							<Skeleton className="mt-2 h-4 w-72 max-w-full" />
+						</div>
+					</div>
+				</div>
+				<div className="space-y-3 rounded-xl border border-[var(--admin-border)] p-4">
+					<Skeleton className="h-5 w-40" />
+					<Skeleton className="h-4 w-full" />
+					<Skeleton className="h-4 w-2/3" />
+					<Skeleton className="h-9 w-32" />
+				</div>
+			</div>
+		</div>
+	);
+}