Improve accessibility and polish page styling

app/ban/appeal/page.tsx

@@ -12,7 +12,7 @@ export default async function AppealPage() {
   return (
     <>
       <Header />
-      <main className={`section page-content ${styles.page}`}>
+      <main className={`section page-content ${styles.page}`} id="main-content" tabIndex={-1}>
         <span className="eyebrow">MINEGEO</span>
         <h1>{ru ? "Доступ и апелляции." : "Account access & appeals."}</h1>
         {account ? (