refactor: migrate project to TypeScript and translate comments to English

components/LanguageToggle.tsx

@@ -0,0 +1,18 @@
+'use client';
+
+// Switch between Persian and English.
+
+import { Button, Tooltip } from 'antd';
+import { useLanguage } from '@/app/context/LanguageContext';
+
+export default function LanguageToggle() {
+  const { locale, toggleLocale } = useLanguage();
+
+  return (
+    <Tooltip title={locale === 'fa' ? 'Switch to English' : 'تغییر به فارسی'}>
+      <Button shape="circle" size="large" onClick={toggleLocale} aria-label="toggle language">
+        {locale === 'fa' ? 'EN' : 'فا'}
+      </Button>
+    </Tooltip>
+  );
+}