FavoriteAdapter not generated / build_runner produces 0 outputs

### Problem
When trying to run the project, the Hive adapter for the `Favorite` model (`FavoriteAdapter`) is not generated. 
Running `build_runner` produces 0 outputs:

<img width="843" height="202" alt="Image" src="https://github.com/user-attachments/assets/13a2f4e8-bc4d-4f96-ae75-6b5b561e48a1" />