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萤火虫 SDK 的 React 错误边界与根级错误处理器（内部包）。
萤火虫 SDK 的 React 错误边界与根级错误处理器，供 @fz-firefly/react 和 @fz-firefly/taro/react 复用。
这个包不包含任何平台 API，也不创建客户端。业务通常不需要直接安装它。
FireflyErrorBoundary：类组件错误边界，捕获渲染期异常并调用 client.captureException()。FireflyProvider / useFirefly：可选的 Context 注入，方便组件里手动上报。createFireflyErrorHandlers：生成 React 19 createRoot 的 onUncaughtError / onCaughtError / onRecoverableError。toError：把任意抛出值转成 Error。