Fix alignment calculation in sendOpContAuth causing login errors

Co-authored-by: mariuz <18359+mariuz@users.noreply.github.com>

Author: Copilot

lib/wire/connection.js

@@ -233,9 +233,8 @@ class Connection {
         // Send authData as length-prefixed buffer, not string
         msg.addInt(authDataBuffer.length);
         msg.addBuffer(authDataBuffer);
-        // Add alignment padding
-        var alen = (authDataBuffer.length + 3) & ~3;
-        msg.addAlignment(alen - authDataBuffer.length);
+        // Add alignment padding - addAlignment calculates padding from data length
+        msg.addAlignment(authDataBuffer.length);
 
         msg.addString(pluginName, Const.DEFAULT_ENCODING)
         msg.addString(Const.AUTH_PLUGIN_LIST.join(','), Const.DEFAULT_ENCODING);