Fix: Add preventDefault on SplitButton click event

The SplitButton component of PrimeVue was missing a preventDefault()
call when clicking on the button that opens the dropdown menu. This
caused unexpected behavior when interacting with the dropdown menu.
The issue has been resolved by adding the preventDefault() on the click
event, ensuring smooth and expected functionality.

Fixes #4223"

components/lib/splitbutton/SplitButton.vue

@@ -56,7 +56,8 @@ export default {
         });
     },
     methods: {
-        onDropdownButtonClick() {
+        onDropdownButtonClick(event) {
+            event.preventDefault();
             this.$refs.menu.toggle({ currentTarget: this.$el, relatedTarget: this.$refs.button.$el });
             this.isExpanded = this.$refs.menu.visible;
         },
@@ -67,6 +68,8 @@ export default {
             }
         },
         onDefaultButtonClick(event) {
+            event.preventDefault()
+
             if (this.isExpanded) {
                 this.$refs.menu.hide(event);
             }