feat: update AdminPage layout for improved responsiveness and styling

src/app/(pages)/admin/page.tsx

@@ -2,8 +2,8 @@ import CreateArticleForm from '@/ui/components/internal/create-article-form';
 
 const AdminPage = async () => {
     return (
-        <div className='container mx-auto py-10 min-h-3/4'>
-            <div className='h-full rounded-lg border border-border bg-card p-6'>
+        <div className='container mx-auto px-4 py-10 min-h-3/4'>
+            <div className='rounded-lg border border-border p-6'>
                 <h2 className='mb-6 text-2xl font-bold'>Create New Article</h2>
                 <CreateArticleForm />
             </div>