feat(component): add anchor navigation functionality to <post-tab> component

[alionazherdetska]

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📝 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

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[swisspost-bot]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[alionazherdetska]

Closing as a duplicate: #6350