Clean up admin hub UX: tabs, chrome, and redundant headers.

Wire orphan routes into hub tabs, group Radio into primary/tools rows, show theme/language once on desktop, and remove duplicate page titles under AdminHubChrome.

Co-authored-by: Cursor <[email protected]>

src/app/admin/import/page.tsx

@@ -66,11 +66,6 @@ export default async function ImportPage() {
 
 	return (
 		<div className="space-y-6">
-			<div>
-				<h1 className="text-2xl font-bold">{t("title")}</h1>
-				<p className="text-muted-foreground">{t("subtitle")}</p>
-			</div>
-
 			<div className="grid gap-4 sm:grid-cols-2 lg:grid-cols-3">
 				{SECTIONS.map(({ href, label, icon: Icon, description }) => (
 					<Link