feat: react@19 and nextjs support

[danielleroux]

💡 What is the current behavior?

GitHub Issue Number: #1385

🆕 What is the new behavior?

• Generate SSR components to support nextjs v15
• Update @siemens/ix-react package to support react@19
• Wait of solve stencil issue feat: don't hydrate class name in html tag anymore ionic-team/stencil#6091 (comment)

🏁 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
• 📄 Documentation was reviewed/updated (pnpm run 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: dd43412

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

This PR includes changesets to release 6 packages

Name	Type
@siemens/ix-react	Major
nextjs-test-app	Patch
@siemens/ix	Major
@siemens/ix-angular	Major
@siemens/ix-vue	Major
@siemens/ix-aggrid	Patch

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Click here if you're a maintainer who wants to add another changeset to this PR

[nuke-ellington]

Do we really need to add all the SVG and font files for the next example app?

[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