update order detail

lib/features/auth/presentation/pages/register_page.dart

@@ -453,7 +453,7 @@ class _RegisterPageState extends ConsumerState<RegisterPage> {
                     borderRadius: BorderRadius.circular(AppRadius.card),
                     boxShadow: [
                       BoxShadow(
-                        color: Colors.black.withOpacity(0.05),
+                        color: Colors.black.withValues(alpha: 0.05),
                         blurRadius: 10,
                         offset: const Offset(0, 2),
                       ),
@@ -759,7 +759,7 @@ class _RegisterPageState extends ConsumerState<RegisterPage> {
     return customerGroupsAsync.when(
       data: (groups) {
         return DropdownButtonFormField<CustomerGroup>(
-          value: _selectedRole,
+          initialValue: _selectedRole,
           decoration: _buildInputDecoration(
             hintText: 'Chọn vai trò',
             prefixIcon: FontAwesomeIcons.briefcase,
@@ -831,7 +831,7 @@ class _RegisterPageState extends ConsumerState<RegisterPage> {
     return citiesAsync.when(
       data: (cities) {
         return DropdownButtonFormField<City>(
-          value: _selectedCity,
+          initialValue: _selectedCity,
           decoration: _buildInputDecoration(
             hintText: 'Chọn tỉnh/thành phố',
             prefixIcon: Icons.location_city,

lib/features/auth/presentation/widgets/role_dropdown.dart

@@ -55,7 +55,7 @@ class RoleDropdown extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return DropdownButtonFormField<String>(
-      value: value,
+      initialValue: value,
       decoration: InputDecoration(
         hintText: 'Chọn vai trò của bạn',
         hintStyle: const TextStyle(