Refactor view templates: relocate 'merge' action block and standardize 'duplicate link' block handling

src/Bundle/ChillThirdPartyBundle/Resources/views/ThirdParty/view.html.twig

@@ -152,6 +152,17 @@
                     {% endif %}
                 </dl>
             {% endblock %}
+            {% block content_view_actions_merge %}
+                <li>
+                    <a href="{{ chill_path_add_return_path('chill_thirdparty_find_duplicate',
+                        { 'thirdparty_id': entity.id }) }}"
+                       title="{{ 'Merge'|trans }}"
+                       class="btn btn-misc">
+                        <i class="bi bi-chevron-contract"></i>
+                        {{ 'Merge'|trans }}
+                    </a>
+                </li>
+            {% endblock %}
             {% block content_form_actions_delete %}{% endblock %}
             {% block content_view_actions_duplicate_link %}{% endblock %}
         {% endembed %}