Environment manager should suggest unique folder names

Testing #458

While testing the `Auto-Create` environment step, I was asked to enter a name for the virtual environement with `.venv` auto suggested. Accepting this suggestion causes:

![Image](https://github.com/user-attachments/assets/20e63822-a783-4619-9887-7a1b32a19c85)