chore(components): expose header height to root

[myrta2302]

📄 Description

This PR moves the --post-header-height (visible height) and --post-header-expanded-height custom properties to the :root via the header/index.scss. All the custom properties involved and thus also exposed to the :root have also been updated with the post- prefix.
Additionaly, the scroll-padding-top property is set as the value of the (visible) header height.

📝 Checklist

• ✅ My code follows the style guidelines of this project
• 🛠️ I have performed a self-review of my own code
• 📄 I have made corresponding changes to the documentation
• ⚠️ My changes generate no new warnings or errors
• ✔️ Existing unit tests pass locally with my changes

[changeset-bot]

🦋 Changeset detected

Latest commit: 6d1ecec

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

This PR includes changesets to release 12 packages

Name	Type
@swisspost/design-system-documentation	Patch
@swisspost/design-system-components	Patch
@swisspost/design-system-styles	Patch
@swisspost/design-system-components-angular-workspace	Patch
@swisspost/design-system-components-react	Patch
@swisspost/design-system-components-angular	Patch
@swisspost/internet-header	Patch
@swisspost/design-system-nextjs-integration	Patch
@swisspost/design-system-styles-primeng-workspace	Patch
@swisspost/design-system-styles-primeng	Patch
@swisspost/design-system-tokens	Patch
@swisspost/design-system-icons	Patch

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[swisspost-bot]

Related Previews

• https://preview-4925--swisspost-design-system-next.netlify.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