feat: guard to prevent premature form submissions while uploading

templates/admin/system/contact/_form.html.twig

@@ -1,4 +1,5 @@
-{{ form_start(form, { 'attr': { 'hx-post': app.request.uri, 'hx-target': '#htmx-modal', 'hx-swap': 'outerHTML' } }) }}
+{% set formAttr = stimulus_controller('form-upload-guard')|stimulus_action('form-upload-guard', 'guard', 'submit') %}
+{{ form_start(form, { 'attr': { 'hx-post': app.request.uri, 'hx-target': '#htmx-modal', 'hx-swap': 'outerHTML' }|merge(formAttr.toArray()) }) }}
 <div class="flex flex-col space-y-4 pb-4">
     {{ form_row(form.category) }}
     {{ form_row(form.name) }}
@@ -18,7 +19,7 @@
         {{ form_errors(form) }}
     </div>
 </div>
-<button type="submit" class="btn">
+<button type="submit" class="btn" {{ stimulus_target('form-upload-guard', 'submit') }}>
     speichern
 </button>
 {{ form_rest(form) }}