fix(code-preview): update overflow to auto IX-4305

[alexkaduk]

💡 What is the current behavior?

Preview example pages in all five test apps set overflow: hidden on the html element in global.css. When example content exceeds the viewport (common in embedded code previews), overflow is clipped and the page cannot be scrolled.

GitHub Issue Number: IX-4305 (branch feature/IX-4305)

🆕 What is the new behavior?

• html { overflow: hidden; } is changed to overflow: auto in src/preview-examples/global.css across all test apps.
• Tall or wide preview content can scroll instead of being cut off.
• The same one-line CSS change is applied consistently in:
  • packages/html-test-app
  • packages/react-test-app
  • packages/vue-test-app
  • packages/angular-test-app
  • packages/angular-standalone-test-app

🏁 Checklist

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

• 🦮 Accessibility (a11y) features were implemented — N/A (CSS scroll behavior only; no new a11y API)
• 🗺️ Internationalization (i18n) - no hard coded strings — N/A
• 📲 Responsiveness - components handle viewport changes and content overflow gracefully — scroll now available when preview content overflows the viewport
• 📕 Add or update a Storybook story — N/A
• 📄 Documentation was reviewed/updated siemens/ix-docs — N/A (test-app preview CSS only)
• 🧪 Unit tests were added/updated and pass (pnpm test) — N/A
• 📸 Visual regression tests were added/updated and pass (Guide) — N/A
• 🧐 Static code analysis passes (pnpm lint)
• 🏗️ Successful compilation (pnpm build, changes pushed)

[changeset-bot]

⚠️ No Changeset found

Latest commit: 4a92b46

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[netlify]

✅ Deploy Preview for ix-storybook canceled.

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🔨 Latest commit	4a92b46
🔍 Latest deploy log	https://app.netlify.com/projects/ix-storybook/deploys/6a3429048066ca0008603cab

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/IX-4305

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[gemini-code-assist]

Code Review

This pull request updates the global CSS across multiple test applications (Angular Standalone, Angular, HTML, React, and Vue) by changing the html element's overflow property from hidden to auto. The reviewer correctly pointed out that combining width: 100vw with overflow: auto triggers an unwanted horizontal scrollbar when vertical scrolling is active, as 100vw includes the scrollbar width. To fix this layout issue, it is recommended to change width: 100vw to width: 100%.

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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