feat: banner alerts, consumption predictions, scale improvements, kiosk app

- Banner notification system: suspicious quantities + consumption prediction alerts
- Consumption predictions API: tracks 90-day usage patterns, flags >30% deviations
- Scale stability timeout: 5s → 10s, auto-confirm remains 5s
- Scale integration in edit form: weigh button with inline live display
- Banner edit/weigh actions open edit form directly with scale activation
- Cooking mode: Italian aliases + stem-prefix matching for ingredients
- Recipe regeneration: tracks rejected ingredients for diversity
- Settings migration: localStorage → .env server-side storage
- Expiry priority: mandatory ≤3 days, recommended ≤7 days in recipes
- Scale bug fixes: clear stale weight, double-submit guard, cap deduction
- Android kiosk app (evershelf-kiosk): WebView + embedded BLE scale gateway
- Version bump to 1.4.0

manifest.json

@@ -2,7 +2,7 @@
     "name": "EverShelf",
     "short_name": "EverShelf",
     "description": "Gestione completa della dispensa di casa con scansione barcode",
-    "version": "1.2.0",
+    "version": "1.4.0",
     "start_url": "/evershelf/",
     "display": "standalone",
     "background_color": "#f0f4e8",