userfront i18n placeholder 치환과 번역 렌더링 오류 수정

userfront/lib/features/profile/presentation/pages/profile_page.dart

@@ -57,6 +57,18 @@ class _ProfilePageState extends ConsumerState<ProfilePage> {
   Map<String, dynamic>? _passwordPolicy;
   bool _isPasswordPolicyLoading = false;
 
+  String _renderTranslatedText(
+    String key, {
+    String? fallback,
+    Map<String, String> values = const {},
+  }) {
+    var text = tr(key, fallback: fallback);
+    values.forEach((name, value) {
+      text = text.replaceAll('{{$name}}', value).replaceAll('{$name}', value);
+    });
+    return text;
+  }
+
   @override
   void initState() {
     super.initState();
@@ -98,16 +110,16 @@ class _ProfilePageState extends ConsumerState<ProfilePage> {
     final requiresSymbol = _passwordPolicy?['nonAlphanumeric'] ?? true;
 
     final parts = <String>[
-      tr(
+      _renderTranslatedText(
         'msg.userfront.signup.policy.min_length',
-        params: {'count': '$minLength'},
+        values: {'count': '$minLength'},
       ),
     ];
     if (minTypes > 0) {
       parts.add(
-        tr(
+        _renderTranslatedText(
           'msg.userfront.signup.policy.min_types',
-          params: {'count': '$minTypes'},
+          values: {'count': '$minTypes'},
         ),
       );
     }
@@ -124,9 +136,9 @@ class _ProfilePageState extends ConsumerState<ProfilePage> {
       parts.add(tr('msg.userfront.signup.policy.symbol'));
     }
 
-    return tr(
+    return _renderTranslatedText(
       'msg.userfront.signup.policy.summary',
-      params: {'rules': parts.join(", ")},
+      values: {'rules': parts.join(", ")},
     );
   }
 
@@ -688,7 +700,11 @@ class _ProfilePageState extends ConsumerState<ProfilePage> {
               crossAxisAlignment: CrossAxisAlignment.start,
               children: [
                 Text(
-                  tr('msg.userfront.profile.greeting', params: {'name': name}),
+                  _renderTranslatedText(
+                    'msg.userfront.profile.greeting',
+                    fallback: 'Hello, {{name}}.',
+                    values: {'name': name},
+                  ),
                   style: const TextStyle(
                     fontSize: 20,
                     fontWeight: FontWeight.w700,