Inline errors not working for radio buttons

Problem/Motivation

Inline error messages for radio buttons in fieldset elements are not visible.

In form-element.html.twig (lines 96-100), errors are properly styled with Bootstrap alert classes:

<div class="form-item--error-message alert alert-danger alert-sm">
  {{ errors }}
</div>

However, in fieldset.html.twig, errors lack these classes:

<div>
  {{ errors }}
</div>

This results in inconsistent inline errors where text fields show the red error icon and alert styling, but radio button groups do not.

Steps to reproduce

Create a webform with a required radio button field inside a fieldset
Submit the form without selecting a radio option
Error message appears but lacks the in-line alert and error icon

Proposed resolution

Update fieldset.html.twig to match the error styling used in form-element.html.twig:

Add the form-item--error-message alert alert-danger alert-sm classes to the error div
Move the error block after , this positions the error message near the label text, consistent with how errors appear for other form elements.

</legend>
{% if errors %}
  <div class="form-item--error-message alert alert-danger alert-sm">
    {{ errors }}
  </div>
{% endif %}
<div class="fieldset-wrapper">

User interface changes

Before: radio button does not have in-line alert icon

After

Error messages for fieldset elements (radio buttons) will display with consistent styling matching other form elements.