전화번호 기본값 변경

frontend/lib/features/auth/presentation/login_screen.dart

@@ -120,6 +120,9 @@ class _LoginScreenState extends ConsumerState<LoginScreen>
     if (rawPhone.isEmpty) return;
 
     String phone = rawPhone.replaceAll(RegExp(r'[-\s]'), '');
+    if (phone.startsWith('010')) {
+      phone = '+82${phone.substring(1)}'; // Convert 010 to +8210
+    }
     debugPrint("[Auth] Initiating SMS Enchanted Link for: $phone");
     
     try {
@@ -378,7 +381,7 @@ class _LoginScreenState extends ConsumerState<LoginScreen>
                             controller: _phoneController,
                             decoration: const InputDecoration(
                               labelText: "Phone Number",
-                              hintText: "+82 10-1234-5678",
+                              hintText: "010-1234-5678",
                               border: OutlineInputBorder(),
                               prefixIcon: Icon(Icons.phone_android),
                             ),