refactor(engine): reset inherited counters without allocating dummy base instance

Author: javiluli

fx/src/main/java/visualizer/fx/SortEngine.java

@@ -192,7 +192,8 @@ private void fail(Throwable error) {
     }
 
     private void resetCounters() {
-        new AdicionalesSorts(0);
+        // Reset the shared legacy metrics explicitly, without allocating an unused object.
+        AdicionalesSorts.resetCounters();
         DibujarGraficos.finSort = false;
         DibujarGraficos.mismo = 0;
         DibujarGraficos.anterioresMismo = -1;
@@ -232,7 +233,11 @@ public void close() {
         worker.shutdownNow();
     }
 
-    /** Compatibility adapter; no visible Swing UI is built or rendered. */
+    /**
+     * Adapter required by the legacy constructor signatures: the original
+     * algorithms expect MainAplicacion and call its animation methods directly.
+     * Only these callbacks are overridden; no visible Swing window is created.
+     */
     private final class LegacyCallbacks extends MainAplicacion {
         @Override
         public void updateAnimaciones() {