Add safety badges for expired products

- 🗑️ Buttare (red): perishable items (latticini, carne, pesce, frutta,
  verdura) expired >2 days, or any items expired >6 months
- 👀 Controlla (yellow): semi-perishable (pane, surgelati) within 30 days,
  or long-shelf items 1-6 months past, or fresh items just expired in frigo
- ✅ OK (green): long-shelf items (pasta, conserve, condimenti, cereali,
  snack) within 30 days of TMC date
- Tooltip on hover explains the safety recommendation
- Added p.category to expired items SQL query
- Safety logic uses mapToLocalCategory + location + days expired

api/index.php

@@ -524,7 +524,7 @@ function getStats(PDO $db): void {
     
     // Expired
     $expired = $db->query("
-        SELECT i.*, p.name, p.brand 
+        SELECT i.*, p.name, p.brand, p.category 
         FROM inventory i JOIN products p ON i.product_id = p.id 
         WHERE i.expiry_date IS NOT NULL AND i.expiry_date < date('now')
         ORDER BY i.expiry_date ASC