Only add live region to form button if there are messages attached to…

… the button; add loading message on add passkey click

src/templates/_includes/forms/button.twig

@@ -3,6 +3,7 @@
 {% set failureMessage = failureMessage ?? false %}
 {% set retryMessage = retryMessage ?? false %}
 {% set successMessage = successMessage ?? false %}
+{% set enableLiveRegion = busyMessage or failureMessage or retryMessage or successMessage %}
 {% set label = label ?? null %}
 {% set labelHtml = labelHtml ?? null %}
 {% set attributes = {
@@ -22,7 +23,7 @@
 }|merge(attributes ?? {}) -%}
 
 {% apply spaceless %}
-    {% if spinner %}
+    {% if spinner and enableLiveRegion %}
         <div role="status" class="visually-hidden"></div>
     {% endif %}
     {% tag 'button' with attributes %}

src/web/assets/passkeysetup/src/PasskeySetup.js

@@ -52,6 +52,7 @@ Craft.PasskeySetup = Garnish.Base.extend({
     }
 
     this.$addPasskeyBtn.addClass('loading');
+    Craft.cp.announce(Craft.t('app', 'Loading'));
 
     try {
       await (() =>