[feat](trx-client): propagate server_latitude/longitude from snapshot

Map server_latitude and server_longitude from RigSnapshot to RigState
in remote_client and set None defaults in standalone client init.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Stanislaw Grams <stanislawgrams@gmail.com>

src/trx-client/src/main.rs

@@ -269,6 +269,8 @@ async fn async_init() -> DynResult<AppState> {
         },
         server_callsign: None,
         server_version: None,
+        server_latitude: None,
+        server_longitude: None,
     };
     let (state_tx, state_rx) = watch::channel(initial_state);
 

src/trx-client/src/remote_client.rs

@@ -182,6 +182,8 @@ pub fn state_from_snapshot(snapshot: trx_core::RigSnapshot) -> RigState {
         },
         server_callsign: snapshot.server_callsign,
         server_version: snapshot.server_version,
+        server_latitude: snapshot.server_latitude,
+        server_longitude: snapshot.server_longitude,
     }
 }