mac prompt box has weird unicode character insertion on left/right

<img width="965" height="419" alt="Image" src="https://github.com/user-attachments/assets/4f6138be-3dc9-44f8-bd05-191f26848eae" />

<img width="966" height="491" alt="Image" src="https://github.com/user-attachments/assets/4b38ba68-bbac-4881-b09a-35465a0a0cb1" />


Pressing "left" inserts boxes. 

Pressing "right" gets stuck. 