[Bug]: client-side exception when visiting useLayoutEffect page

Summary

Sometime this afternoon, the page for useLayoutEffect:

https://react.dev/reference/react/useLayoutEffect

broke with:

Application error: a client-side exception has occurred (see the browser console for more information).

Page

https://react.dev/reference/react/useLayoutEffect

Details

Console:

framework-76ad44d61c11f057.js:1 Error: File /src/App.js was defined multiple times. Each file snippet should have a unique path name
    at 145-0963f310eaedf893.js:1:299499
    at Array.reduce (<anonymous>)
    at n (145-0963f310eaedf893.js:1:298499)
    at 145-0963f310eaedf893.js:1:250798
    at lb (framework-76ad44d61c11f057.js:1:41610)
    at aY (framework-76ad44d61c11f057.js:1:61337)
    at aW (framework-76ad44d61c11f057.js:1:60197)
    at aB (framework-76ad44d61c11f057.js:1:59814)
    at ot (framework-76ad44d61c11f057.js:1:76212)
    at ua (framework-76ad44d61c11f057.js:1:111832)
aR @ framework-76ad44d61c11f057.js:1
main-6b2aa10951d4c273.js:1 Error: File /src/App.js was defined multiple times. Each file snippet should have a unique path name
    at 145-0963f310eaedf893.js:1:299499
    at Array.reduce (<anonymous>)
    at n (145-0963f310eaedf893.js:1:298499)
    at 145-0963f310eaedf893.js:1:250798
    at lb (framework-76ad44d61c11f057.js:1:41610)
    at aY (framework-76ad44d61c11f057.js:1:61337)
    at aW (framework-76ad44d61c11f057.js:1:60197)
    at aB (framework-76ad44d61c11f057.js:1:59814)
    at ot (framework-76ad44d61c11f057.js:1:76212)
    at ua (framework-76ad44d61c11f057.js:1:111832)
Q @ main-6b2aa10951d4c273.js:1
main-6b2aa10951d4c273.js:1 A client-side exception has occurred, see here for more info: https://nextjs.org/docs/messages/client-side-exception-occurred
Q @ main-6b2aa10951d4c273.js:1

Browser: Chromium 141, Firefox 143
OS: Linux

Possibly related to 8d73630aa5463c394d1b825d35b804a2a9e4324b (#8058). So, C/C'ing @poteto.

在 Chromium 或 Firefox 中复现 useLayoutEffect 参考页面上的客户端异常，并检查浏览器控制台中是否存在重复的 /src/App.js 代码片段错误。将该页面与相关 issue #8058 进行比较，并确定重复代码片段的路径。完成的标准是页面加载时不再出现客户端异常，且其中的代码片段具有唯一路径。