Freezer-aware expired safety + shopping count in dashboard

- getExpiredSafety: items in freezer get bonus days (carne/pesce +3m, verdura/frutta +6m, latticini/pane +2m, altro +4m)
- Expired items show location icon (❄️/🧊) for context
- Dashboard: replaced 'Totale' stat card with 'Spesa' showing Bring! list count
- Added loadShoppingCount() to fetch count from Bring! API

index.html

@@ -46,10 +46,10 @@
                 <span class="stat-value" id="stat-freezer">0</span>
                 <span class="stat-label">Freezer</span>
             </div>
-            <div class="stat-card" onclick="showPage('inventory', '')">
-                <span class="stat-icon">📦</span>
-                <span class="stat-value" id="stat-total">0</span>
-                <span class="stat-label">Totale</span>
+            <div class="stat-card" onclick="showPage('shopping')">
+                <span class="stat-icon">🛒</span>
+                <span class="stat-value" id="stat-spesa">-</span>
+                <span class="stat-label">Spesa</span>
             </div>
         </div>