feat(core/content-header): implement changes on content header

[RamVinayMandal]

💡 What is the current behavior?

The content-header component lacks support for a header slot, limiting customization options for the header section.

JIRA ticket: IX-2486

🆕 What is the new behavior?

Feature:

• ix-content-header now supports a header slot.
• Content in <ix-pill slot="header"> (or similar) appears after the title and before action buttons.
• Supports pills, chips, badges, or custom elements (per Figma/UX).
• Spacing and alignment:
  • 8px total gap between title and slotted content (4px from title, 4px from pill).
  • 8px minimum gap to action buttons.
  • 6px top padding for slot content.
  • Handles overflow and wrapping for long titles or slot content.
• Available and demonstrated in all frameworks (HTML, Angular, React, Vue).

Note: I'll raise the PR for ix-docs repo once it is merged.

Other:

• Removed duplicate component declarations from app.module.ts in the Angular test app.

🏁 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 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]

⚠️ No Changeset found

Latest commit: 27c374d

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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