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/rooms/page.tsx

@@ -48,12 +48,9 @@ export default async function RoomsPage({
 
 	return (
 		<div className="space-y-6">
-			<div>
-				<h1 className="text-3xl font-bold tracking-tight">Rooms</h1>
-				<p className="text-muted-foreground">
-					{result.total.toLocaleString()} rooms total
-				</p>
-			</div>
+			<p className="text-muted-foreground">
+				{result.total.toLocaleString()} rooms total
+			</p>
 
 			<RoomsTable
 				data={{