Fix expiring section: show soonest 10 items instead of 7-day window

- Change query from 7-day threshold to soonest 10 items with expiry
- Section now always visible when items have expiry dates
- Improved badges: OGGI, Domani, N giorni, Ng, ~N mesi
- Color coding: red (today), orange (≤7d), yellow (≤30d), grey (>30d)
- Renamed section to 'Prossime Scadenze'

assets/css/style.css

@@ -290,6 +290,16 @@ body {
     color: #fff;
 }
 
+.alert-item-badge.expiring-soon {
+    background: #ffc107;
+    color: #333;
+}
+
+.alert-item-badge.expiring-later {
+    background: #e0e0e0;
+    color: #555;
+}
+
 .alert-item-badge.expired {
     background: var(--danger);
     color: #fff;