[AU4] Track panel header - fix hover behavior

[kryksyh]

Hovering over a child element would not remove the hover status from the parent.

The intended behavior:

https://github.com/user-attachments/assets/1fa8ac63-4b48-49a5-982f-979dcb12b2df

[DilsonsPickles]

Please pay special attention to the hover styling as it is currently not correct.

Designs can be found here.

[dozzzzer]

Tested