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/banners/page.tsx

@@ -15,12 +15,6 @@ export default async function BannersPage() {
 
 	return (
 		<div className="space-y-6">
-			<div>
-				<h1 className="text-3xl font-bold tracking-tight">Banners</h1>
-				<p className="text-muted-foreground">
-					Manage homepage banners and promotional slides
-				</p>
-			</div>
 			<BannersManager banners={banners} />
 		</div>
 	);