Refactor language switcher to use PopupMenuButton for improved UI and locale selection

Author: winechit-dev

lib/app/widgets/language_switcher.dart

@@ -7,23 +7,54 @@ class LanguageSwitcher extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return Row(
-      mainAxisSize: MainAxisSize.min,
-      children: [
-        ElevatedButton(
-          onPressed: () {
-            context.read<LocalizationProvider>().setLocale('en');
-          },
-          child: const Text('English'),
+    final currentLocale = context.watch<LocalizationProvider>().locale;
+    final currentLanguage = currentLocale.languageCode == 'en' ? 'English' : 'ไทย';
+
+    return PopupMenuButton<String>(
+      icon: Row(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          Text(
+            currentLanguage,
+            style: const TextStyle(
+              color: Colors.black87,
+              fontWeight: FontWeight.w500,
+            ),
+          ),
+          const Icon(Icons.arrow_drop_down, color: Colors.black87),
+        ],
+      ),
+      itemBuilder: (context) => [
+        PopupMenuItem(
+          value: 'en',
+          child: Row(
+            children: [
+              const Text('English'),
+              if (currentLocale.languageCode == 'en')
+                const Padding(
+                  padding: EdgeInsets.only(left: 8.0),
+                  child: Icon(Icons.check, size: 18),
+                ),
+            ],
+          ),
         ),
-        const SizedBox(width: 8),
-        ElevatedButton(
-          onPressed: () {
-            context.read<LocalizationProvider>().setLocale('th');
-          },
-          child: const Text('ไทย'),
+        PopupMenuItem(
+          value: 'th',
+          child: Row(
+            children: [
+              const Text('ไทย'),
+              if (currentLocale.languageCode == 'th')
+                const Padding(
+                  padding: EdgeInsets.only(left: 8.0),
+                  child: Icon(Icons.check, size: 18),
+                ),
+            ],
+          ),
         ),
       ],
+      onSelected: (String languageCode) {
+        context.read<LocalizationProvider>().setLocale(languageCode);
+      },
     );
   }
 }