Persian calendar with enUS locale showing empty cells

When using the `enUS` locale, the Persian calendar shows an extra row with empty days:

<img width="696" alt="Image" src="https://github.com/user-attachments/assets/89a33a76-6545-42b2-9a31-090b72a2b4c4" />

https://daypicker.dev/docs/localization#english-us-locale

