Add width computation methods to InnerListViewSkin

Implemented `computeMinWidth`, `computePrefWidth`, and `computeMaxWidth` methods to calculate the width based on insets and the loading pane. This ensures consistency with height computation and improves layout handling for the skin.

gemsfx/src/main/java/com/dlsc/gemsfx/skins/InnerListViewSkin.java

@@ -136,4 +136,19 @@ protected double computePrefHeight(double width, double topInset, double rightIn
     protected double computeMaxHeight(double width, double topInset, double rightInset, double bottomInset, double leftInset) {
         return loadingPane.maxHeight(width) + topInset + bottomInset;
     }
+
+    @Override
+    protected double computeMinWidth(double height, double topInset, double rightInset, double bottomInset, double leftInset) {
+        return loadingPane.minWidth(height) + leftInset + rightInset;
+    }
+
+    @Override
+    protected double computePrefWidth(double height, double topInset, double rightInset, double bottomInset, double leftInset) {
+        return loadingPane.prefWidth(height) + leftInset + rightInset;
+    }
+
+    @Override
+    protected double computeMaxWidth(double height, double topInset, double rightInset, double bottomInset, double leftInset) {
+        return loadingPane.maxWidth(height) + leftInset + rightInset;
+    }
 }