已统一修复任务管理与对话页在同会话并发控制和刷新后补流上的行为：批量子任务现在会注册会话运行锁并镜像进度事件到 task-events，因此会正确拦截并发继续对话且刷新后可持续显示执行进度。
We unified Task Management and Chat behavior for same-conversation concurrency and post-refresh replay: batch subtasks now register conversation task locks and publish progress to task-events, so concurrent follow-up is properly blocked and streaming progress continues after refresh.