docs: add explanation about theme access in StyleSheet.create API and web error

[jpudysz]

Summary

Explains better web error while following tutorial.

Fixes:

• Issue with tutorial when running on web #913
• Unistyles: You're trying to get theme "undefined" but it wasn't registered. #904

Summary by CodeRabbit

• Documentation
  • Added an informational aside explaining how to access the theme object with Unistyles' StyleSheet in the tutorial.
  • Provided guidance for users encountering issues when following the tutorial on the web, advising focus on iOS for now.

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[coderabbitai]

Walkthrough

An informational aside was added to the tutorial documentation, explaining how to access the theme object when using Unistyles' StyleSheet compared to the standard React Native API. The aside also provides guidance for users encountering issues on the web platform and clarifies the focus on iOS support in the tutorial.

Changes

Files	Change Summary
docs/src/content/docs/v3/tutorial/cleanup-screens.mdx	Added an informational aside explaining theme access differences and web platform considerations.

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Actionable comments posted: 0

🧹 Nitpick comments (2)

docs/src/content/docs/v3/tutorial/cleanup-screens.mdx (2)

145-147: Use the same code-fence metadata pattern used elsewhere

Other snippets in this doc use the title="<path>" lang="tsx" syntax.
Keeping the pattern consistent avoids rendering quirks in Starlight and helps readers quickly spot the file path.

-```tsx /theme/
+```tsx title="/theme" lang="tsx"

---

152-154: Provide a direct link to the web-setup guide or the referenced issues

Readers hitting the web error will appreciate an immediate pointer instead of having to search. Consider adding links to the future web-setup section or directly to issues #913 and #904.

Example:

For now, focus on iOS. We'll show you how to get it working on the web later — see
[our web setup guide](../web-setup) or follow progress in
[#913](https://github.com/jpudysz/react-native-unistyles/issues/913) and
[#904](https://github.com/jpudysz/react-native-unistyles/issues/904).

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📥 Commits

Reviewing files that changed from the base of the PR and between cb5e4e1 and 181421f.

📒 Files selected for processing (1)

• docs/src/content/docs/v3/tutorial/cleanup-screens.mdx (1 hunks)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (1)

• GitHub Check: lint