Focus clipping in multisite dropdown

### Bug description

<img width="250" height="182" alt="Image" src="https://github.com/user-attachments/assets/05e87708-0888-4711-971f-8c4b49dd0673" />

### How to reproduce

see Screenshot above

### Logs

```shell

```

### Environment

```yaml
6.0.0-beta.6
```

### Installation

Fresh statamic/statamic site via CLI

### Additional details

_No response_