Add listener to close dropdown.

js/toolbar-dropdown.js

@@ -37,6 +37,14 @@
               e.currentTarget.getAttribute('aria-expanded') === 'false',
             );
           });
+
+          // Event listener to close dropdown when clicking outside
+          document.addEventListener('click', (e) => {
+            const isButtonClicked = trigger.contains(e.target);
+            if (!isButtonClicked) {
+              trigger.setAttribute('aria-expanded', 'false');
+            }
+          });
         },
       );
     },