Add extension link to navbar and footer

Author: maitamdev

app/components/Footer.tsx

@@ -39,6 +39,7 @@ export default function Footer() {
               <li><Link href="/scan" className="text-gray-400 hover:text-white transition-colors">Phân tích hình ảnh</Link></li>
               <li><Link href="/quiz" className="text-gray-400 hover:text-white transition-colors">Quiz trắc nghiệm</Link></li>
               <li><Link href="/guide" className="text-gray-400 hover:text-white transition-colors">Cẩm nang</Link></li>
+              <li><Link href="/extension" className="text-gray-400 hover:text-white transition-colors">Browser Extension</Link></li>
             </ul>
           </div>
 

app/components/Header.tsx

@@ -13,6 +13,7 @@ const navLinks = [
   { href: '/quiz', label: 'Trắc nghiệm' },
   { href: '/guide', label: 'Cẩm nang' },
   { href: '/report', label: 'Báo cáo' },
+  { href: '/extension', label: 'Extension' },
   { href: '/pricing', label: 'Bảng giá' },
   { href: '/about', label: 'Giới thiệu' },
 ]