Scoped labels: set aria-disabled on muted Exclusive option for a11y

It is convenient to be able to toggle off this option after removing / from
the name. This ensures the muted state is communicated to blind users even
when the input is not fully disabled.

Part of go-gitea#22974

web_src/js/features/comp/LabelEdit.js

@@ -13,13 +13,15 @@ function updateExclusiveLabelEdit(form) {
 
   if (isExclusiveScopeName(nameInput.val())) {
     exclusiveField.removeClass('muted');
+    exclusiveField.removeAttr('aria-disabled');
     if (exclusiveCheckbox.prop('checked') && exclusiveCheckbox.data('exclusive-warn')) {
       exclusiveWarning.removeClass('gt-hidden');
     } else {
       exclusiveWarning.addClass('gt-hidden');
     }
   } else {
     exclusiveField.addClass('muted');
+    exclusiveField.attr('aria-disabled', 'true');
     exclusiveWarning.addClass('gt-hidden');
   }
 }