use variables in template

app/views/templates_form_preview/show.html.erb

@@ -23,8 +23,8 @@
           </select>
         </form>
       <% end %>
-      <% unless params[:task_preview_mode] == 'true' %>
-        <a href="<%= edit_template_path(@template, params[:auth_token] || session[:auth_token] ? { auth_token: params[:auth_token] || session[:auth_token] } : {}) %>" class="base-button" data-turbo="false" style="flex-shrink: 0; padding: 0px 24px;">
+      <% unless @task_preview_mode == 'true' %>
+        <a href="<%= edit_template_path(@template, @auth_token || session[:auth_token] ? { auth_token: @auth_token || session[:auth_token] } : {}) %>" class="base-button" data-turbo="false" style="flex-shrink: 0; padding: 0px 24px;">
           <%= t('exit_preview') %>
         </a>
       <% end %>