fix: remove unused useState import in lifecycle-of-reactive-effects

[jahanzaib-iqbal-dev]

Summary

The ChatRoom.js sandpack in the "Fix a connection switch" challenge on the Lifecycle of Reactive Effects page imports useState but the component only uses useEffect. The unused import can confuse learners who may wonder why it's there.

Before:

import { useState, useEffect } from 'react';

After:

import { useEffect } from 'react';

Fixes #8231

[github-actions]

Size changes

Details

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[jahanzaib-iqbal-dev]

@rickhanlonii @gaearon small one-line fix removing an unused useState import that could confuse learners. CI is green — would appreciate a review when you get a chance! 🙏