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

src/app/admin/radio/autodj/page.tsx

@@ -118,7 +118,7 @@ export default async function AdminRadioAutoDjPage() {
       <section className="mt-6">
         <h2 className="admin-section-title">{t("autoDjForm.addTrack")}</h2>
         <form action={createTrack} className="admin-card">
-          <div className="grid cols-2">
+          <div className="grid grid-cols-1 gap-4 md:grid-cols-2">
             <div>
               <label htmlFor="new_title" style={{ display: 'block', fontWeight: 700 }}>
                 {t("autoDjForm.title")}