[liana-business] Add policy description to Settings>Wallet page

In this page, we should have the policy written in "human" form as we have in Liana :

<img width="1492" height="1030" alt="Image" src="https://github.com/user-attachments/assets/e49a6e76-c3e7-46cd-a6b6-7a55b8baadd4" />