commands: cannot add messages to the message command

There's an issue in the command editor for the "Message" command.

Pressing the "ADD ITEM" button for the "Messages" field does nothing.

<img width="720" height="674" alt="Image" src="https://github.com/user-attachments/assets/0058c85b-fc45-4c99-8497-27f1f2b431c7" />