wrong code

Github documentation page:

https://github.com/firebase/snippets-web/blob/467eaa165dcbd9b3ab15711e76fa52237ba37f8b/auth/auth-state-persistence.js#L1-L27

Firebase documentation page:

https://firebase.google.com/docs/auth/web/auth-state-persistence?hl=pt-br#web_1

**wrong imports: ❌**

```
import firebase from "firebase/app";
import "firebase/auth";
```

**correctly imports: ✅**
```
import firebase from "firebase/compat/app"; // Or the modular import
import "firebase/compat/auth"; // Or the modular import for getAuth
```

Open auth/auth-state-persistence.js at lines 1-27 and compare it with the Firebase authentication state persistence page linked in the issue. Verify which import style the current documentation requires, update the snippet accordingly, and confirm the rendered example no longer shows the incorrect imports.

Written by the indexing model from the issue text.