fix(docs): fix <post-banner> Web Component examples behavior in documentation

[alionazherdetska]

📄 Description

This update corrects the behavior of the banner examples in the documentation.

• The Reset Banner button is now hidden initially.
• It only becomes visible after the banner has been dismissed via the close button or programmatically

---

📝 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
• 🧪 I have added tests that prove my fix is effective or that my feature works
• ✔️ New and existing unit tests pass locally with my changes

[changeset-bot]

🦋 Changeset detected

Latest commit: 219257b

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

This PR includes changesets to release 1 package

Name	Type
@swisspost/design-system-documentation	Patch

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[swisspost-bot]

Related Previews

• https://preview-6076--swisspost-design-system-next.netlify.app

[leagrdv]

It works as intended but I feel like when dismissed, the code preview should still be the banner. Right now, it's the reset button code.

Also, could you update the dismissal behavior on the snapshot as well? When you dismiss a banner, it just disappear but there is no "Reset button" to show it back.

[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

[leagrdv]

This is more a fix than a chore, so if you could update the PR title before merging to something like fix(docs): <post-banner> web component ex..., that'd be great :)