[Mainnet Perf] Get chat working against D14N

**Description:**

Ry: 
It's quite easy to point xmtp.chat to a gateway by editing local storage.
just edit the highlighted row by enclosing the gateway host in quotes

<img width="1103" height="856" alt="Image" src="https://github.com/user-attachments/assets/b5a77f5d-541b-4282-8111-c228cf947d04" />