Zone line type cannot be changed after creation

One of the parameters for line types cannot be altered after creating a zone: 

## On creation
<img width="492" height="115" alt="Image" src="https://github.com/user-attachments/assets/e8380845-b17d-4bf0-8a80-f45188311c86" />

## Edit panel

<img width="298" height="288" alt="Image" src="https://github.com/user-attachments/assets/94d68a02-9f81-4889-8b0c-c9f79de212c7" />