feat: quiz page question rework (#181)

- Replace Bootstrap accordion with flat card list for questions
- Add HTML5 drag-and-drop reordering with placeholder-between-cards UX
  and amber/green/red save status indicator next to the heading
- Add edit button per question opening a Bootstrap modal (bo--modal-form
  Stimulus controller with X-Modal-Request header pattern)
- Show read-only view button instead of edit for locked/finalized quizzes
- Add BankQuestion edit modal in question bank tab using same infrastructure
- Move modal action buttons into modal-footer via <template data-modal-footer>
- Fix IS_AUTHENTICATED_FULLY 403: replace ROLE_USER with IS_AUTHENTICATED
  on all backoffice controllers and in security.yaml access_control

templates/backoffice/quiz/_question_detail_body.html.twig

@@ -0,0 +1,21 @@
+<p class="fw-semibold mb-3">{{ question.question }}</p>
+
+<ul class="list-group">
+    {% for answer in question.answers %}
+        <li class="list-group-item d-flex justify-content-between align-items-center">
+            <span{% if answer.isRightAnswer %} class="fw-semibold"{% endif %}>
+                {% if answer.isRightAnswer %}<i class="bi bi-check-circle-fill text-success me-1"></i>{% endif %}
+                {{ answer.text }}
+            </span>
+            {% if answer.candidates|length > 0 %}
+                <span class="text-muted small">{{ answer.candidates|map(c => c.name)|join(', ') }}</span>
+            {% endif %}
+        </li>
+    {% else %}
+        <li class="list-group-item text-muted">{{ 'There are no answers for this question'|trans }}</li>
+    {% endfor %}
+</ul>
+
+<template data-modal-footer>
+    <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">{{ 'Close'|trans }}</button>
+</template>