Fix group switching: send selectGroup on background thread

app/src/main/java/ru/ua1zbe/svxremote/SvxService.kt

@@ -89,7 +89,8 @@ class SvxService : Service(), ReflectorClient.Callbacks {
     fun isRunning(): Boolean = client.isRunning()
 
     fun selectGroup(tg: Long) {
-        client.selectGroup(tg)
+        // Сеть запрещена в главном потоке (NetworkOnMainThreadException)
+        Thread { client.selectGroup(tg) }.start()
     }
 
     fun startTx() {

app/src/main/java/ru/ua1zbe/svxremote/proto/ReflectorClient.kt

@@ -171,7 +171,8 @@ class ReflectorClient(
         try {
             Log.d(TAG, "selectGroup tg=$tg")
             sendTcp(sock, MsgBuilder.selectTg(tg))
-        } catch (_: Exception) {
+        } catch (e: Exception) {
+            Log.w(TAG, "selectGroup send failed: ${e.javaClass.simpleName}: ${e.message}")
         }
     }