feat(components): create post popover trigger component

[myrta2302]

📄 Description

This PR introduces a <post-popover-trigger> web component to replace the former data-popover-target=" " implementation.
Aria attribute and focus management logic is now handeled within the trigger component.
Documentation and tests are updated accordingly.

📝 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 udpated the existing tests
• ✔️ New and existing unit tests pass locally with my changes
• ♿I have performed a (manual) accessibility check

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Latest commit: 9c8927d

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[swisspost-bot]

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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

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