fix(ui): fix button getting smaller when moving mouse too quickly #14

src/main/java/de/hdm_stuttgart/battlearena/Controller/ButtonTransition.java

+package de.hdm_stuttgart.battlearena.Controller;
+
+import javafx.animation.ScaleTransition;
+import javafx.scene.control.Button;
+import javafx.scene.control.skin.ButtonSkin;
+import javafx.util.Duration;
+
+public class ButtonTransition extends ButtonSkin {
+    public ButtonTransition(Button button) {
+        super(button);
+//        set transition for mouse hovering over button
+        final ScaleTransition fadeIn = new ScaleTransition(Duration.millis(150));
+        fadeIn.setNode(button);
+        fadeIn.setToX(1.1);
+        fadeIn.setToY(1.1);
+        button.setOnMouseEntered(e -> fadeIn.playFromStart());
+
+//        set transition for mouse exiting buttonButtonTransitionScale
+        final ScaleTransition fadeOut = new ScaleTransition(Duration.millis(150));
+        fadeOut.setNode(button);
+        fadeOut.setToX(1.0);
+        fadeOut.setToY(1.0);
+        button.setOnMouseExited(e -> fadeOut.playFromStart());
+
+        button.setScaleX(1.0);
+        button.setScaleY(1.0);
+    }
+}
+