Frontend metadata tags with different values for the same field

The kleinkram frontend allows users to add metadata tags with different values for the same field. The delete operation for a metadata tag also does not work.

<img width="1139" height="237" alt="Image" src="https://github.com/user-attachments/assets/eeddb0d8-7d95-4071-81a1-0082bdba5050" />