feat: AI price estimation for shopping list with per-item real-time display

- Add get_shopping_price / get_all_shopping_prices API endpoints
- AI (Gemini) estimates retail price per natural unit (pack, piece, bunch)
  instead of always per-kg — avoids absurd totals like €1609
- _calcEstimatedTotal: proper g/ml→package conversion using defQty + regex
  on unit_label; only 'kg'/'l' labels trigger weight/volume math
- Cache key bumped to v2 to invalidate old per-kg cached entries
- Suggested quantity cap lowered from 20 to 10 conf/pz
- Unit mismatch guard: if totalUsed >> buyCount*5 for unit=conf, use
  purchase frequency instead of raw consumption rate
- JS _buildPricePayload: use smartShoppingItems for qty/unit (not Bring! spec)
- JS _cachedPrices: persist in sessionStorage (survives navigation);
  validated by _qty/_unit metadata so stale totals auto-invalidate
- Price display redesigned: right-side column per row (price-col-main +
  price-col-unit) instead of small inline badge
- fetchAllPrices: buttons disabled immediately before guard check;
  running total uses only current shoppingItems (not Object.values cache)
- Background refresh: always silent (removed 90s interaction condition)
- visibilitychange: sets _bgCall=true for shopping before refreshCurrentPage
- .gitignore: add runtime data files (bring_migrate_ts, shopping_price_cache,
  anomaly_dismissed, opened_shelf_cache, shopping_name_cache)
- Remove bring_catalog.json and bring_migrate_ts.json from tracking

translations/de.json

@@ -103,11 +103,13 @@
         "banner_expired_action_throw": "Habe ich weggeworfen",
         "banner_expired_action_edit": "Datum korrigieren",
         "banner_anomaly_action_edit": "Bestand korrigieren",
-        "banner_anomaly_action_dismiss": "Menge ist korrekt",        "banner_no_expiry_title": "Ablaufdatum fehlt: {name}",
+        "banner_anomaly_action_dismiss": "Menge ist korrekt",
+        "banner_no_expiry_title": "Ablaufdatum fehlt: {name}",
         "banner_no_expiry_detail": "Dieses Produkt hat kein Ablaufdatum. Möchten Sie eines hinzufügen oder bestätigen, dass es nicht verfällt?",
         "banner_no_expiry_action_set": "Ablaufdatum setzen",
         "banner_no_expiry_action_dismiss": "Läuft nicht ab ✓",
-        "banner_no_expiry_toast_dismissed": "Als 'läuft nicht ab' markiert",        "banner_expiring_title": "Bald ablaufend",
+        "banner_no_expiry_toast_dismissed": "Als 'läuft nicht ab' markiert",
+        "banner_expiring_title": "Bald ablaufend",
         "banner_expiring_today": "Läuft heute ab!",
         "banner_expiring_tomorrow": "Läuft morgen ab",
         "banner_expiring_days": "Läuft in {days} Tagen ab",
@@ -133,8 +135,7 @@
         "banner_anomaly_phantom_title": "mehr Bestand als erwartet",
         "banner_anomaly_phantom_detail": "Bestand zeigt {inv_qty} {unit}, aber laut Buchungen solltest du nur {expected_qty} {unit} haben. Hast du Bestand ohne Buchung hinzugefügt?",
         "banner_anomaly_untracked_title": "Anfangsbestand nicht als Eingang gebucht",
-        "banner_anomaly_untracked_detail": "Du hast <strong>{inv_qty} {unit}</strong> im Bestand, aber die gebuchten Abgänge übersteigen die Eingänge — der Anfangsbestand wurde wahrscheinlich nie als \"Eingang\" erfasst. Bitte korrigiere die Menge oder trage die fehlenden Eingänge nach."
-,
+        "banner_anomaly_untracked_detail": "Du hast <strong>{inv_qty} {unit}</strong> im Bestand, aber die gebuchten Abgänge übersteigen die Eingänge — der Anfangsbestand wurde wahrscheinlich nie als \"Eingang\" erfasst. Bitte korrigiere die Menge oder trage die fehlenden Eingänge nach.",
         "banner_anomaly_ghost_title": "weniger Bestand als erwartet",
         "banner_anomaly_ghost_detail": "Laut Buchungen solltest du {expected_qty} {unit} von {name} haben, aber der Bestand zeigt nur {inv_qty} {unit}. Hast du etwas ohne Buchung entnommen?",
         "consumed": "Verbraucht: {n} ({pct}%)",
@@ -161,7 +162,8 @@
         "label_quantity": "📦 Menge",
         "label_added": "📅 Hinzugefügt",
         "empty_text": "Keine Produkte hier.<br>Scanne ein Produkt, um es hinzuzufügen!",
-        "empty_db": "Keine Produkte in der Datenbank.<br>Scanne ein Produkt, um loszulegen!"
+        "empty_db": "Keine Produkte in der Datenbank.<br>Scanne ein Produkt, um loszulegen!",
+        "qty_trace": "< 1"
     },
     "scan": {
         "title": "Produkt scannen",
@@ -344,7 +346,7 @@
         "suggestions_title": "💡 KI-Vorschläge",
         "suggestions_add": "✅ Ausgewählte zu Bring! hinzufügen",
         "search_prices": "🔍 Alle Preise suchen",
-        "suggest_btn": "🤖 Einkaufsvorschläge",
+        "suggest_btn": "Einkaufsvorschläge",
         "smart_title": "🧠 Intelligente Vorhersagen",
         "smart_empty": "Keine Vorhersagen verfügbar.<br>Füge Produkte zur Vorratskammer hinzu, um intelligente Vorhersagen zu erhalten.",
         "smart_filter_all": "Alle",
@@ -416,6 +418,10 @@
         "savings_offers": "· 🏷️ Du sparst €{amount} mit Angeboten",
         "searching_progress": "Suche {current}/{total}...",
         "remove_error": "Fehler beim Entfernen",
+        "btn_fetch_prices": "Preise suchen",
+        "price_total_label": "💰 Geschätzter Gesamtpreis:",
+        "price_loading": "Preise werden gesucht…",
+        "price_not_found": "Preis n/v",
         "suggest_loading": "Analyse läuft...",
         "suggest_error": "Fehler bei der Vorschlagserstellung",
         "priority_high": "Hoch",
@@ -508,6 +514,15 @@
             "email_label": "📧 Bring! E-Mail",
             "password_label": "🔒 Bring! Passwort"
         },
+        "price": {
+            "title": "💰 Preisschätzung (KI)",
+            "hint": "Zeigt geschätzte Kosten pro Produkt in der Einkaufsliste mithilfe von KI an.",
+            "enabled_label": "Preisschätzung aktivieren",
+            "country_label": "🌍 Referenzland",
+            "currency_label": "💱 Währung",
+            "update_label": "🔄 Preise aktualisieren alle",
+            "update_suffix": "Monate"
+        },
         "recipe": {
             "title": "🍳 Rezept-Einstellungen",
             "hint": "Konfiguriere die Standardoptionen für die Rezeptgenerierung.",
@@ -906,6 +921,7 @@
     },
     "meal_plan": {
         "reset_success": "Wochenplan zurückgesetzt",
+        "not_available": "nicht im Vorrat verfügbar",
         "suggested_by": "vom Wochenplan vorgeschlagen"
     },
     "kiosk_session": {

translations/en.json

@@ -162,7 +162,8 @@
         "label_quantity": "📦 Quantity",
         "label_added": "📅 Added",
         "empty_text": "No products here.<br>Scan a product to add it!",
-        "empty_db": "No products in the database.<br>Scan a product to get started!"
+        "empty_db": "No products in the database.<br>Scan a product to get started!",
+        "qty_trace": "< 1"
     },
     "scan": {
         "title": "Scan Product",
@@ -345,7 +346,7 @@
         "suggestions_title": "💡 AI Suggestions",
         "suggestions_add": "✅ Add selected to Bring!",
         "search_prices": "🔍 Search all prices",
-        "suggest_btn": "🤖 Suggest what to buy",
+        "suggest_btn": "Suggest what to buy",
         "smart_title": "🧠 Smart Predictions",
         "smart_empty": "No predictions available.<br>Add products to your pantry to receive smart predictions.",
         "smart_filter_all": "All",
@@ -417,6 +418,10 @@
         "savings_offers": "· 🏷️ You save €{amount} with offers",
         "searching_progress": "Searching {current}/{total}...",
         "remove_error": "Removal error",
+        "btn_fetch_prices": "Find prices",
+        "price_total_label": "💰 Estimated total:",
+        "price_loading": "Looking up prices…",
+        "price_not_found": "price n/a",
         "suggest_loading": "Analyzing...",
         "suggest_error": "Suggestion generation error",
         "priority_high": "High",
@@ -509,6 +514,15 @@
             "email_label": "📧 Bring! Email",
             "password_label": "🔒 Bring! Password"
         },
+        "price": {
+            "title": "💰 Price Estimation (AI)",
+            "hint": "Show estimated cost per product in the shopping list using AI.",
+            "enabled_label": "Enable price estimation",
+            "country_label": "🌍 Reference country",
+            "currency_label": "💱 Currency",
+            "update_label": "🔄 Refresh prices every",
+            "update_suffix": "months"
+        },
         "recipe": {
             "title": "🍳 Recipe Preferences",
             "hint": "Configure the default options for recipe generation.",
@@ -907,6 +921,7 @@
     },
     "meal_plan": {
         "reset_success": "Weekly plan reset",
+        "not_available": "not available in pantry",
         "suggested_by": "suggested by weekly plan"
     },
     "kiosk_session": {

translations/it.json

@@ -162,7 +162,8 @@
         "label_quantity": "📦 Quantità",
         "label_added": "📅 Aggiunto",
         "empty_text": "Nessun prodotto qui.<br>Scansiona un prodotto per aggiungerlo!",
-        "empty_db": "Nessun prodotto nel database.<br>Scansiona un prodotto per iniziare!"
+        "empty_db": "Nessun prodotto nel database.<br>Scansiona un prodotto per iniziare!",
+        "qty_trace": "< 1"
     },
     "scan": {
         "title": "Scansiona Prodotto",
@@ -345,7 +346,7 @@
         "suggestions_title": "💡 Suggerimenti AI",
         "suggestions_add": "✅ Aggiungi selezionati a Bring!",
         "search_prices": "🔍 Cerca tutti i prezzi",
-        "suggest_btn": "🤖 Suggerisci cosa comprare",
+        "suggest_btn": "Suggerisci cosa comprare",
         "smart_title": "🧠 Previsioni intelligenti",
         "smart_empty": "Nessuna previsione disponibile.<br>Aggiungi prodotti alla dispensa per ricevere previsioni intelligenti.",
         "smart_filter_all": "Tutti",
@@ -417,6 +418,10 @@
         "savings_offers": "· 🏷️ Risparmi €{amount} con le offerte",
         "searching_progress": "Cerco {current}/{total}...",
         "remove_error": "Errore nella rimozione",
+        "btn_fetch_prices": "Cerca i prezzi",
+        "price_total_label": "💰 Spesa stimata:",
+        "price_loading": "Ricerca prezzi…",
+        "price_not_found": "prezzo n/d",
         "suggest_loading": "Analisi in corso...",
         "suggest_error": "Errore nella generazione",
         "priority_high": "Alta",
@@ -509,6 +514,15 @@
             "email_label": "📧 Email Bring!",
             "password_label": "🔒 Password Bring!"
         },
+        "price": {
+            "title": "💰 Stima Prezzi (AI)",
+            "hint": "Mostra il costo stimato di ogni prodotto nella lista della spesa usando l'AI.",
+            "enabled_label": "Attiva stima prezzi",
+            "country_label": "🌍 Paese di riferimento",
+            "currency_label": "💱 Valuta",
+            "update_label": "🔄 Aggiorna prezzi ogni",
+            "update_suffix": "mesi"
+        },
         "recipe": {
             "title": "🍳 Preferenze Ricette",
             "hint": "Configura le opzioni predefinite per la generazione delle ricette.",
@@ -907,7 +921,8 @@
     },
     "meal_plan": {
         "reset_success": "Piano settimanale ripristinato",
-        "suggested_by": "suggerito dal piano settimanale"
+        "suggested_by": "suggerito dal piano settimanale",
+        "not_available": "non disponibile in dispensa"
     },
     "kiosk_session": {
         "first_item": "Primo prodotto: {name}!",