fix(react): correct tree expanded event type

[nuke-ellington]

💡 What is the current behavior?

GitHub Issue Number: #

🆕 What is the new behavior?

🏁 Checklist

A pull request can only be merged if all of these conditions are met (where applicable):

• 🦮 Accessibility (a11y) features were implemented
• 🗺️ Internationalization (i18n) - no hard coded strings
• 📲 Responsiveness - components handle viewport changes and content overflow gracefully
• 📕 Add or update a Storybook story
• 📄 Documentation was reviewed/updated siemens/ix-docs
• 🧪 Unit tests were added/updated and pass (pnpm test)
• 📸 Visual regression tests were added/updated and pass (Guide)
• 🧐 Static code analysis passes (pnpm lint)
• 🏗️ Successful compilation (pnpm build, changes pushed)

👨‍💻 Help & support

[changeset-bot]

🦋 Changeset detected

Latest commit: 1d28f60

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 7 packages

Name	Type
@siemens/ix-react	Major
@siemens/ix-docs	Major
@siemens/ix	Major
@siemens/ix-angular	Major
@siemens/ix-vue	Major
@siemens/ix-aggrid	Major
@siemens/ix-echarts	Major

Not sure what this means? Click here to learn what changesets are.

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[netlify]

✅ Deploy Preview for ix-storybook canceled.

Name	Link
🔨 Latest commit	1d28f60
🔍 Latest deploy log	https://app.netlify.com/projects/ix-storybook/deploys/6a86edd46299d00008e3e2b5

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📥 Commits

Reviewing files that changed from the base of the PR and between 5d02ab3 and 1d28f60.

📒 Files selected for processing (3)

• .changeset/fix-react-tree-expanded.md
• packages/react/src/tree/internal-tree.tsx
• packages/react/src/tree/tree.tsx

✨ Finishing Touches

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• Commit unit tests in branch fix/ix-tree-expanded-typo

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud