feat(message): 添加点击会话发送测试消息功能

- 导入 IM 管理器和扩展组件- 在会话列表项上添加点击手势识别器
- 点击时调用 IM 管理器发送文本消息方法
- 发送固定内容“来了”作为测试消息- 保留原有未读计数显示逻辑不变

lib/pages/message/conversation_tab.dart

@@ -1,3 +1,5 @@
+import 'package:dating_touchme_app/extension/ex_widget.dart';
+import 'package:dating_touchme_app/im/im_manager.dart';
 import 'package:flutter/material.dart';
 import 'package:dating_touchme_app/generated/assets.dart';
 import 'package:get/get.dart';
@@ -147,83 +149,88 @@ class _ConversationTabState extends State<ConversationTab> with AutomaticKeepAli
                 future: controller.getUnreadCount(conversation),
                 builder: (context, snapshot){
                   int unreadCount = snapshot.data ?? 0;
-                  return Container(
-                    padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
-                    decoration: const BoxDecoration(
-                      color: Colors.white,
-                      borderRadius: BorderRadius.all(Radius.circular(16)),
-                    ),
-                    margin: const EdgeInsets.only(bottom: 8, left: 16, right: 16),
-                    child: Row(
-                      crossAxisAlignment: CrossAxisAlignment.start,
-                      children: [
-                        // 头像
-                        Container(
-                          width: 56,
-                          height: 56,
-                          decoration: BoxDecoration(
-                            borderRadius: BorderRadius.circular(28),
-                            image: DecorationImage(
-                              image: userInfo?.avatarUrl != '' ? NetworkImage(userInfo?.avatarUrl ?? '') : AssetImage(Assets.imagesAvatarsExample),
-                              fit: BoxFit.cover,
+                  return GestureDetector(
+                    onTap: () async{
+                      await IMManager.instance.sendTextMessage('来了', conversation.id);
+                    },
+                    child: Container(
+                      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+                      decoration: const BoxDecoration(
+                        color: Colors.white,
+                        borderRadius: BorderRadius.all(Radius.circular(16)),
+                      ),
+                      margin: const EdgeInsets.only(bottom: 8, left: 16, right: 16),
+                      child: Row(
+                        crossAxisAlignment: CrossAxisAlignment.start,
+                        children: [
+                          // 头像
+                          Container(
+                            width: 56,
+                            height: 56,
+                            decoration: BoxDecoration(
+                              borderRadius: BorderRadius.circular(28),
+                              image: DecorationImage(
+                                image: userInfo?.avatarUrl != '' ? NetworkImage(userInfo?.avatarUrl ?? '') : AssetImage(Assets.imagesAvatarsExample),
+                                fit: BoxFit.cover,
+                              ),
                             ),
                           ),
-                        ),
-                        const SizedBox(width: 12),
-                        // 会话信息
-                        Expanded(
-                          child: Column(
-                            crossAxisAlignment: CrossAxisAlignment.start,
-                            children: [
-                              Row(
-                                mainAxisAlignment: MainAxisAlignment.spaceBetween,
-                                children: [
-                                  Text(
-                                    userInfo?.nickName ?? '联系人',
-                                    style: const TextStyle(
-                                      fontSize: 16,
-                                      fontWeight: FontWeight.w500,
-                                      color: Colors.black,
+                          const SizedBox(width: 12),
+                          // 会话信息
+                          Expanded(
+                            child: Column(
+                              crossAxisAlignment: CrossAxisAlignment.start,
+                              children: [
+                                Row(
+                                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
+                                  children: [
+                                    Text(
+                                      userInfo?.nickName ?? '联系人',
+                                      style: const TextStyle(
+                                        fontSize: 16,
+                                        fontWeight: FontWeight.w500,
+                                        color: Colors.black,
+                                      ),
                                     ),
-                                  ),
-                                  Text(
-                                    controller.formatMessageTime(message?.serverTime ?? 0),
-                                    style: const TextStyle(
-                                      fontSize: 12,
-                                      color: Colors.grey,
+                                    Text(
+                                      controller.formatMessageTime(message?.serverTime ?? 0),
+                                      style: const TextStyle(
+                                        fontSize: 12,
+                                        color: Colors.grey,
+                                      ),
                                     ),
+                                  ],
+                                ),
+                                const SizedBox(height: 4),
+                                Text(
+                                  controller.getLastMessageContent(message),
+                                  style: const TextStyle(
+                                    fontSize: 14,
+                                    color: Colors.grey,
                                   ),
-                                ],
+                                  overflow: TextOverflow.ellipsis,
+                                ),
+                              ],
+                            ),
+                          ),
+                          // 未读消息数
+                          if (unreadCount > 0)
+                            Container(
+                              padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 2),
+                              decoration: BoxDecoration(
+                                color: Colors.red,
+                                borderRadius: BorderRadius.circular(10),
                               ),
-                              const SizedBox(height: 4),
-                              Text(
-                                controller.getLastMessageContent(message),
+                              child: Text(
+                                unreadCount.toString(),
                                 style: const TextStyle(
-                                  fontSize: 14,
-                                  color: Colors.grey,
+                                  fontSize: 12,
+                                  color: Colors.white,
                                 ),
-                                overflow: TextOverflow.ellipsis,
-                              ),
-                            ],
-                          ),
-                        ),
-                        // 未读消息数
-                        if (unreadCount > 0)
-                          Container(
-                            padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 2),
-                            decoration: BoxDecoration(
-                              color: Colors.red,
-                              borderRadius: BorderRadius.circular(10),
-                            ),
-                            child: Text(
-                              unreadCount.toString(),
-                              style: const TextStyle(
-                                fontSize: 12,
-                                color: Colors.white,
                               ),
                             ),
-                          ),
-                      ],
+                        ],
+                      ),
                     ),
                   );
                 }