Tabs feedback

[michaelmkraus]

Proposed changes

• Refactored to Buttons: Changed tab-item structure from radio inputs to native elements to improve semantics and accessibility.
• Added Truncation Tooltip: Implemented logic to automatically detect truncated text and display a DBTooltip for overflowing content.
• Corrected Alignment: Fixed vertical tab layout, trailing icon positioning, and enforced tooltip placement.
• Updated Framework Config: Adjusted Angular controlValueAccessor to support the new button-based state (internalActive) instead of checked inputs.

resolves https://github.com/db-ux-design-system/core-team/issues/1634
closes #4898
resolves #5046
resolves #2477
resolved #3331

Types of changes

• Bugfix (non-breaking change that fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (improvements to existing components or architectural decisions)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

🔭🐙🐈 Test this branch here: https://design-system.deutschebahn.com/core-web/review/feat-1453-tabs-feedback

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[nmerget]

Why did you rename this and removed the | string?

[michaelmkraus]

I had to rename it because using standard HTML attribute names triggered unexpected behavior in Stencil and Angular due to automatic attribute reflection on the host element.
I will try to find another solution.