refactor: 重构弹窗组件支持自定义图标组件

apps/lib/features/auth/presentation/screens/login_screen.dart

@@ -12,6 +12,7 @@ import '../../../settings/presentation/utils/legal_document_assets.dart';
 import '../../../../l10n/app_localizations.dart';
 import '../../../../shared/theme/design_tokens.dart';
 import '../../../../shared/widgets/app_modal_dialog.dart';
+import '../../../../shared/widgets/gua_icon.dart';
 import '../../../../shared/widgets/toast/toast.dart';
 import '../../../../shared/widgets/toast/toast_type.dart';
 
@@ -193,7 +194,7 @@ class _LoginScreenState extends State<LoginScreen> {
         return AppModalDialog(
           title: title,
           message: content,
-          icon: Icons.description_outlined,
+          iconWidget: const GuaIcon(),
           actions: [
             AppModalDialogAction(
               label: AppLocalizations.of(dialogContext)!.dialogConfirm,