fix(mermaid): 修复代码更新后的渲染状态恢复 - #78
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* test(mermaid): 覆盖源码更新后的状态恢复 * fix(mermaid): 重置源码更新后的渲染状态 * test(mermaid): 消除异步渲染测试竞态 * chore(build): 同步 lib 构建产物
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问题
MermaidNode之前分别维护html和failed两份状态。当一次 render 失败后再收到新的有效 code：
failed可能继续残留；修复
将渲染状态收敛为显式状态机：
loadingreadyerrorcode 更新时先进入
loading，成功后进入ready，异常时进入error，并保留 async lifecycle guard，避免旧 render 覆盖新状态。测试
新增回归测试覆盖：
验证
提交 PR 前已执行：
pnpm run checklib/产物