fix(button): prevent default behavior for spacebar

Author: Nikki Massaro Kauffman

elements/pf-button/pf-button.ts

@@ -287,6 +287,12 @@ export class PfButton extends LitElement {
   #onKeydown(event: KeyboardEvent) {
     switch (event.key) {
       case ' ':
+        event.preventDefault();
+        event.stopPropagation();
+        if (this.dispatchEvent(new MouseEvent('click', { bubbles: true, cancelable: true, view: window }))) {
+          this.#onClick();
+        }
+        break;
       case 'Enter':
         if (this.dispatchEvent(new MouseEvent('click', { bubbles: true, cancelable: true, view: window }))) {
           this.#onClick();