feat(message): 完善会话消息内容展示和时间格式化

- 支持展示图片、语音、视频、文件和位置类型的消息内容
-优化消息时间格式化逻辑，区分今天、昨天和其他日期
- 调整推荐用户列表高度并移除冗余间距

lib/controller/message/conversation_controller.dart

@@ -54,7 +54,23 @@ class ConversationController extends GetxController {
   /// 获取会话的最新消息
   String getLastMessageContent(EMMessage? message) {
     if(message?.body.type == MessageType.TXT){
-
+      EMTextMessageBody body = message?.body as EMTextMessageBody;
+      return body.content;
+    }else if(message?.body.type == MessageType.IMAGE){
+      EMImageMessageBody body = message?.body as EMImageMessageBody;
+      return '[图片]';
+    }else if(message?.body.type == MessageType.VOICE){
+      EMVoiceMessageBody body = message?.body as EMVoiceMessageBody;
+      return '[语音]';
+    }else if(message?.body.type == MessageType.VIDEO){
+      EMVideoMessageBody body = message?.body as EMVideoMessageBody;
+      return '[视频]';
+    }else if(message?.body.type == MessageType.FILE){
+      EMFileMessageBody body = message?.body as EMFileMessageBody;
+      return '[文件]';
+    }else if(message?.body.type == MessageType.LOCATION){
+      EMLocationMessageBody body = message?.body as EMLocationMessageBody;
+      return '[位置]';
     }
     return '暂无消息';
   }
@@ -72,34 +88,29 @@ class ConversationController extends GetxController {
     }
   }
 
-  /// 获取会话最后消息的时间
-  String getConversationLastMessageTime(EMConversation conversation) {
-    try {
-      // 返回默认时间
-      return '刚刚';
-    } catch (e) {
-      if (Get.isLogEnable) {
-        Get.log('Error getting last message time: $e');
-      }
-      return '';
-    }
-  }
-
   /// 格式化消息时间
   String formatMessageTime(int timestamp) {
     DateTime messageTime = DateTime.fromMillisecondsSinceEpoch(timestamp);
     DateTime now = DateTime.now();
-    Duration difference = now.difference(messageTime);
-
-    if (difference.inDays > 0) {
-      return '${difference.inDays}天前';
-    } else if (difference.inHours > 0) {
-      return '${difference.inHours}小时前';
-    } else if (difference.inMinutes > 0) {
-      return '${difference.inMinutes}分钟前';
-    } else {
-      return '刚刚';
+    
+    // 检查是否是今天
+    if (messageTime.year == now.year && 
+        messageTime.month == now.month && 
+        messageTime.day == now.day) {
+      // 今天显示时:分
+      return '${messageTime.hour.toString().padLeft(2, '0')}:${messageTime.minute.toString().padLeft(2, '0')}';
+    }
+    
+    // 检查是否是昨天
+    DateTime yesterday = now.subtract(Duration(days: 1));
+    if (messageTime.year == yesterday.year && 
+        messageTime.month == yesterday.month && 
+        messageTime.day == yesterday.day) {
+      return '昨天';
     }
+    
+    // 其他日期显示月-日
+    return '${messageTime.month.toString().padLeft(2, '0')}-${messageTime.day.toString().padLeft(2, '0')}';
   }
 
   Future<EMUserInfo> loadContact(String userId) async{

lib/pages/message/conversation_tab.dart

@@ -74,7 +74,7 @@ class _ConversationTabState extends State<ConversationTab> with AutomaticKeepAli
   // 构建推荐用户横向滚动列表
   Widget _buildRecommendedUsers() {
     return SizedBox(
-      height: 100,
+      height: 60,
       child: ListView.builder(
         scrollDirection: Axis.horizontal,
         padding: const EdgeInsets.symmetric(horizontal: 16),
@@ -124,8 +124,6 @@ class _ConversationTabState extends State<ConversationTab> with AutomaticKeepAli
                       ),
                   ],
                 ),
-                const SizedBox(height: 4),
-                Text(user["type"], style: const TextStyle(color: Colors.white)),
               ],
             ),
           );