fix: resolve AutoRelog reconnect errors (#3036)

- Reset _BotRecoAttempts on successful game join so retry counter
  does not carry stale state across sessions
- Display "unlimited" instead of near-int.MaxValue retry count when
  Retries is set to -1 (infinite)
- Guard SendText with CanSendMessage check to prevent
  NullReferenceException when bots call send after disconnect
- Catch SocketException/IOException in Protocol18 Updater thread so
  a closed socket triggers OnConnectionLost gracefully instead of an
  unhandled exception

Made-with: Cursor

MinecraftClient/McClient.cs

@@ -1579,6 +1579,12 @@ namespace MinecraftClient
             if (String.IsNullOrEmpty(text))
                 return;
 
+            if (!CanSendMessage)
+            {
+                Log.Warn(Translations.mcc_send_text_not_connected);
+                return;
+            }
+
             int maxLength = handler.GetMaxChatMessageLength();
 
             lock (chatQueue)