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/rare-values/page.tsx

@@ -1,4 +1,3 @@
-import { Gem } from "lucide-react";
 import { getTranslations } from "next-intl/server";
 import {
 	createCategory,
@@ -54,20 +53,6 @@ export default async function AdminRareValues() {
 
 	return (
 		<main>
-			<div className="flex items-center gap-3 mb-6">
-				<div className="w-10 h-10 rounded-xl bg-gradient-to-br from-[var(--admin-accent)]/20 to-[var(--admin-accent)]/5 grid place-items-center">
-					<Gem size={20} className="text-[var(--admin-accent)]" />
-				</div>
-				<div>
-					<h1 className="m-0 text-xl font-extrabold text-[var(--admin-text)]">
-						{t("title")}
-					</h1>
-					<p className="m-0 text-xs text-[var(--admin-text-muted)] mt-0.5">
-						{t("subtitle")}
-					</p>
-				</div>
-			</div>
-
 			<div className="grid grid-cols-[repeat(auto-fit,minmax(180px,1fr))] gap-3.5 mb-6">
 				<StatusCard
 					label={t("categories")}