feat: banner opened items show 'aperto da X giorni in frigo' instead of 'scaduto'

When inventory item has opened_at set, the expired banner now shows:
- Title: '[Nome] — Aperto da troppo tempo!' (instead of '— Scaduto!')
- Detail: 'Aperto da N giorni in [icon] [location] · hai ancora X'
Also removed hardcoded Italian 'scade il' string from non-opened expired detail.

index.html

@@ -11,7 +11,7 @@
     <title>EverShelf</title>
     <link rel="manifest" href="manifest.json">
     <link rel="icon" type="image/png" href="assets/img/logo/logo_icon.png">
-    <link rel="stylesheet" href="assets/css/style.css?v=20260511e">
+    <link rel="stylesheet" href="assets/css/style.css?v=20260511f">
     <!-- QuaggaJS for barcode scanning -->
     <script src="https://cdn.jsdelivr.net/npm/@ericblade/quagga2@1.8.4/dist/quagga.min.js"></script>
     <!-- @xenova/transformers: ES-module bootstrap that exposes a lazy category-classifier as window._categoryPipelinePromise -->
@@ -1469,6 +1469,6 @@
     </div>
 </div>
 
-<script src="assets/js/app.js?v=20260511e"></script>
+<script src="assets/js/app.js?v=20260511f"></script>
 </body>
 </html>