Use new channel icon for archived channels

I just noticed on CZO another kind of channel icon, specifically for archived channels:

<img width="383" height="101" alt="Image" src="https://github.com/user-attachments/assets/ac1fd92e-3990-40c0-b7a1-cade572286f2" />

We should ask Vlad for a version of that to use in mobile.