Add a restart button to the survey draft view

Pretesters had no way to leave or restart the draft view other than
clicking through every remaining question (customer pretest finding
no. 2). The preview keeps its state exclusively in hidden POST fields,
so a plain GET on the preview URL starts over at question 1 - the new
'Umfragenentwurf von vorn beginnen' button in the preview notice bar
links exactly there and is visible on every draft page including the
completion page. Jump marks remain deliberately unsupported so the
draft view keeps mirroring the real participation flow.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

contao/templates/frontend/show_survey.html.twig

@@ -30,7 +30,10 @@
             {% endif %}
 
             {% if isPreview %}
-                <div class="survey-alert warning">{{ 'survey.survey.preview_notice'|trans }}</div>
+                <div class="survey-alert warning survey-preview-bar">
+                    <span>{{ 'survey.survey.preview_notice'|trans }}</span>
+                    <a class="survey-button secondary survey-preview-restart" href="{{ previewRestartUrl }}">{{ 'survey.survey.preview_restart'|trans }}</a>
+                </div>
             {% endif %}
 
             {% if progress.total > 0 %}

public/css/survey-frontend.css

@@ -727,6 +727,20 @@
 .survey-alert.error { border-color: rgba(157, 82, 118, 0.28); color: var(--survey-purple); }
 .survey-alert.warning { border-color: rgba(236, 124, 50, 0.28); color: var(--survey-orange); }
 
+.survey-preview-bar {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: 0.8rem;
+    flex-wrap: wrap;
+}
+
+.survey-preview-bar .survey-preview-restart {
+    flex-shrink: 0;
+    padding: 0.45rem 0.95rem;
+    font-size: 0.85rem;
+}
+
 .survey-kpis {
     display: grid;
     gap: 1rem;

src/Controller/FrontendModule/ShowSurveyController.php

@@ -170,6 +170,10 @@ final class ShowSurveyController extends AbstractFrontendModuleController
 
     private function buildPreviewResponse(FragmentTemplate $template, SurveyModel $survey, Request $request): Response
     {
+        // Die Entwurfsansicht hält ihren Zustand nur in POST-Feldern – ein einfacher
+        // GET auf dieselbe URL beginnt daher wieder bei Frage 1 ("von vorn beginnen").
+        $template->set('previewRestartUrl', $request->getUri());
+
         $history = $this->decodePreviewHistory((string) $request->request->get('preview_history', ''));
         $question = $this->resolvePreviewQuestion($survey, (int) $request->request->get('preview_question', 0));
 

translations/messages.de.yaml

@@ -145,6 +145,7 @@ survey:
     next: "Weiter"
     preview_badge: "Entwurf"
     preview_notice: "Dies ist eine Entwurfsansicht. Antworten können getestet werden, werden aber nicht gespeichert."
+    preview_restart: "Umfragenentwurf von vorn beginnen"
     preview_thanks_text: "Der Testlauf ist abgeschlossen. Antworten wurden nicht gespeichert."
   results:
     section_kicker: "Themenbereich"

translations/messages.en.yaml

@@ -145,6 +145,7 @@ survey:
     next: "Next"
     preview_badge: "Draft"
     preview_notice: "This is a draft view. Answers can be tested, but they will not be stored."
+    preview_restart: "Restart the survey draft"
     preview_thanks_text: "The test run is complete. Answers were not stored."
   results:
     section_kicker: "Topic section"