chore: 抢单图标与IM心跳修复，排行榜奖励开发前备份

Co-authored-by: Cursor <cursoragent@cursor.com>

utils/chat-core.js

@@ -515,21 +515,16 @@ function startHeartbeat(app) {
   let convTick = 0;
   goEasyConnection.heartbeatInterval = setInterval(() => {
     if (goEasyConnection.status === 'connected' && wx.goEasy?.im) {
-      wx.goEasy.im.ping({
-        onSuccess: () => {
-          convTick += 1;
-          if (convTick % 3 === 0) {
-            loadConversations(app);
-          }
-        },
-        onFailed: (error) => {
-          console.error('心跳失败:', error);
-          if (isSdkConnected()) return;
-          goEasyConnection.status = 'reconnecting';
-          app.emitEvent('connectionChanged', { status: 'reconnecting' });
-          attemptReconnect(app);
-        },
-      });
+      if (isSdkConnected()) {
+        convTick += 1;
+        if (convTick % 3 === 0) {
+          loadConversations(app);
+        }
+      } else {
+        goEasyConnection.status = 'reconnecting';
+        app.emitEvent('connectionChanged', { status: 'reconnecting' });
+        attemptReconnect(app);
+      }
     } else if (goEasyConnection.autoReconnect && !isSdkConnected()) {
       ensureConnection(app);
     }