failed to create pull request: repeat PR, better error msging

Got this error code, it would be great if it was formatted a bit better and provided a link to the existing pull request which already exists (so I can go take a look at that one and confirm)

<img width="961" height="722" alt="Image" src="https://github.com/user-attachments/assets/f7412328-75f2-420e-b8e5-e7dab4b38ead" />