Fix theme consistency, i18n completeness, CSS variable naming, and hardcoded strings

src/app/admin/ip/page.tsx

@@ -72,7 +72,7 @@ export default async function AdminIp() {
         />
       </div>
 
-      <div className="grid cols-2">
+      <div className="grid grid-cols-1 gap-4 md:grid-cols-2">
         {/* ── Whitelist ──────────────────── */}
         <section className="mt-6">
           <h2 className="admin-section-title">{t("whitelist")}</h2>