Allow the server to also inform the client of additional channels it knows about

I'd love for the server to be able to append known radio stations to the clients list during startup, perhaps as a second list that appears beside or below the local list. Functionally they'd work the same though.

No files or tests are named. Start by tracing the server startup flow and the client code that builds and displays the local station list; done means the server can send additional known stations during startup and the client displays them in a separate list with the same behavior.

Written by the indexing model from the issue text.