Fix chat-js snippets

[sacOO7]

Summary by CodeRabbit

• Documentation
  • Updated React and React Native guides to reference the new useRoomReactions() hook
  • Fixed React component syntax errors in setup documentation
  • Improved code examples for clarity and accuracy

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Walkthrough

This pull request updates documentation across multiple chat-related guides. The primary changes include renaming the reactions API hook from useReactions() to useRoomReactions(), correcting a React component syntax error in setup documentation, and adding a missing return statement to a React code example.

Changes

Cohort / File(s)	Summary
Hook API Updates src/pages/docs/chat/getting-started/react.mdx, src/pages/docs/chat/getting-started/react-native.mdx	Updated hook name from useReactions() to useRoomReactions() with corresponding documentation link updates in both React and React Native guides.
React Component Code Examples src/pages/docs/chat/setup.mdx, src/pages/docs/chat/rooms/reactions.mdx	Fixed React component syntax error (const App = => { to const App = () => {) in setup docs. Added missing return statement to render a div element in the useRoomReactions example component.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A hook was renamed with such grace,
Docs refreshed to find their place,
Syntax errors vanished quick,
Examples now render—oh, what a trick!
Clearer paths for all to chase!

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Fix chat-js snippets' is directly related to the changeset, which fixes multiple chat documentation snippets across React, React Native, and setup files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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