fix(react-aria): guard DOM access to prevent crash on React Native

[mrsants]

Closes #<ISSUE_NUMBER>

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue.
• Added/updated unit tests and storybook for this change (not applicable – no behavior change in DOM environments).
• Filled out test instructions.
• Updated documentation (not applicable – internal utility change).
• Looked at the Accessibility Practices for this feature – no impact on ARIA behavior.

📝 Test Instructions:

1. Run the project in a browser environment and verify that transitions behave as expected.
2. Call runAfterTransition during active CSS transitions and confirm callbacks execute after transitions complete.
3. Run the same code in a non-DOM environment (e.g. React Native or SSR) and verify:
   • No runtime errors related to window or document
   • runAfterTransition executes the callback immediately.

🧢 Your Project:

Community contribution