uf 액션 토스트 공통화 및 SnackBar 제거

userfront/lib/features/auth/presentation/reset_password_screen.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:go_router/go_router.dart';
 import '../../../core/i18n/locale_utils.dart';
 import '../../../core/services/auth_proxy_service.dart';
+import '../../../core/ui/toast_service.dart';
 import 'package:userfront/i18n.dart';
 
 class ResetPasswordScreen extends StatefulWidget {
@@ -84,12 +85,7 @@ class _ResetPasswordScreenState extends State<ResetPasswordScreen> {
       );
 
       if (mounted) {
-        ScaffoldMessenger.of(context).showSnackBar(
-          SnackBar(
-            content: Text(tr('msg.userfront.reset.success')),
-            backgroundColor: Colors.green,
-          ),
-        );
+        ToastService.success(tr('msg.userfront.reset.success'));
         context.go(buildLocalizedSigninPath(Uri.base));
       }
     } catch (e) {
@@ -109,9 +105,7 @@ class _ResetPasswordScreenState extends State<ResetPasswordScreen> {
   }
 
   void _showError(String message) {
-    ScaffoldMessenger.of(context).showSnackBar(
-      SnackBar(content: Text(message), backgroundColor: Colors.red),
-    );
+    ToastService.error(message);
   }
 
   String _buildPolicyDescription() {