Replace native confirm() with in-app dialog for cancel/delete sale

The Cancel sale / Delete sale actions used the browser's native confirm()
('pos.ladill.com says…'). Render the store-driven ladillConfirm prompt (already
registered in app.js but never displayed) via a new partials/confirm-prompt and
have the two forms open it instead — branded, with sale-specific copy.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

resources/views/components/app-layout.blade.php

@@ -28,5 +28,6 @@
         </div>
     </div>
     @include('partials.afia')
+    @include('partials.confirm-prompt')
 </body>
 </html>