import completions don't work in the sandbox

### Describe the Bug

```py
reveal_type
```

<img width="591" height="97" alt="Image" src="https://github.com/user-attachments/assets/4b5819b7-139f-46b6-a2c9-07d2ba64db6c" />

clicking this doesn't do anything

### Sandbox Link

https://pyrefly.org/sandbox/