감정표현, 채팅응답대기 추가

lib/models/chat_message.dart

@@ -2,11 +2,13 @@ class ChatMessage {
   final String text;
   final bool isUser;
   final DateTime timestamp;
+  final int? emotionCategory;  // ← 새로 추가 (봇 메시지의 감정)
 
   ChatMessage({
     required this.text,
     required this.isUser,
     required this.timestamp,
+    this.emotionCategory,
   });
 
   // JSON에서 ChatMessage로 변환
@@ -15,6 +17,7 @@ class ChatMessage {
       text: json['text'] as String,
       isUser: json['isUser'] as bool,
       timestamp: DateTime.parse(json['timestamp'] as String),
+      emotionCategory: json['emotionCategory'] as int?,
     );
   }
 
@@ -24,6 +27,7 @@ class ChatMessage {
       'text': text,
       'isUser': isUser,
       'timestamp': timestamp.toIso8601String(),
+      'emotionCategory': emotionCategory,
     };
   }
 }