优化逻辑

admin/dashboard/templates/message_push_management.html

@@ -652,6 +652,9 @@ new Vue({
                 preview_recipients: []
             };
             this.imageList = [];
+            this.voiceList = [];  // 清空语音列表
+            this.videoList = [];  // 清空视频列表
+            this.thumbnailList = [];  // 清空缩略图列表
             this.taskDialogVisible = true;
             this.isEdit = false;
         },