fix(cowork): CopyButton 组件卸载后定时器未清理导致内存泄漏

[linlihua]

问题背景

关联 Issue：#886
对话详情页的复制按钮（CopyButton）点击后使用裸 setTimeout 在 2 秒后
重置复制状态。当组件在定时器触发前卸载（如用户快速切换会话、消息列表
重渲染），回调仍会执行 setCopied(false)，产生 React「更新已卸载组件」
警告及潜在内存泄漏。

根本原因

// 修复前
const handleCopy = async () => {
  await navigator.clipboard.writeText(content);
  setCopied(true);
  setTimeout(() => setCopied(false), 2000);  // ← 裸 setTimeout，无清理
};
setTimeout 返回的 timer ID 没有被保存，组件也没有在卸载时
清理该定时器。在对话流式输出期间，消息列表频繁重渲染，
CopyButton 可能被反复挂载/卸载，泄漏的定时器会不断累积。
修复方案
采用同仓库 MarkdownContent.tsx 中已验证的正确模式：
// 修复后
const copyTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
useEffect(() => {
  return () => {
    if (copyTimerRef.current) clearTimeout(copyTimerRef.current);
  };
}, []);
const handleCopy = async () => {
  await navigator.clipboard.writeText(content);
  setCopied(true);
  if (copyTimerRef.current) clearTimeout(copyTimerRef.current);
  copyTimerRef.current = setTimeout(() => setCopied(false), 2000);
};
- 用 useRef 持有 timer ID
- useEffect cleanup 中 clearTimeout 确保卸载时清理
- 连续点击时先清除上一个 timer 再创建新的，避免多个并发定时器
变更文件
- src/renderer/components/cowork/CoworkSessionDetail.tsx — CopyButton
  组件 setTimeout 替换为 useRef + useEffect cleanup
测试结果
Test Files  19 passed (22)
Tests      225 passed (225)

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