[feat](trx-client): preserve server callsign/version and default to N0CALL

Carry server_callsign and server_version through from received
snapshots into the local RigState. Default client callsign is
N0CALL when not configured.

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

src/trx-client/src/config.rs

@@ -28,7 +28,7 @@ pub struct ClientConfig {
 }
 
 /// General application settings.
-#[derive(Debug, Clone, Default, Serialize, Deserialize)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(default)]
 pub struct GeneralConfig {
     /// Callsign or owner label to display in frontends
@@ -37,6 +37,15 @@ pub struct GeneralConfig {
     pub log_level: Option<String>,
 }
 
+impl Default for GeneralConfig {
+    fn default() -> Self {
+        Self {
+            callsign: Some("N0CALL".to_string()),
+            log_level: None,
+        }
+    }
+}
+
 /// Remote connection configuration.
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(default)]

src/trx-client/src/main.rs

@@ -267,6 +267,8 @@ async fn async_init() -> DynResult<AppState> {
             clar_on: None,
             enabled: Some(false),
         },
+        server_callsign: None,
+        server_version: None,
     };
     let (state_tx, state_rx) = watch::channel(initial_state);
 

src/trx-client/src/remote_client.rs

@@ -180,6 +180,8 @@ pub fn state_from_snapshot(snapshot: trx_core::RigSnapshot) -> RigState {
             clar_on: None,
             enabled: snapshot.enabled,
         },
+        server_callsign: snapshot.server_callsign,
+        server_version: snapshot.server_version,
     }
 }