fix(i18n): translate antiwaste title in IT/DE + use quantity validation

- translations: antiwaste.title = 'Rapporto Anti-Spreco' (IT), 'Anti-Verschwendungs-Bericht' (DE)
- translations: add use.error_exceeds_stock in IT/EN/DE
- submitUse(): block submit if qty > available at selected location + shake animation
- adjustUseQty(): cap '+' button at max available at selected location (incl. sub-unit mode)
- style.css: add @keyframes inputShake + .input-shake class

Bump app.js cache buster to v=20260504c

translations/de.json

@@ -242,7 +242,8 @@
         "toast_bring": "🛒 Produkt aufgebraucht → zu Bring! hinzugefügt",
         "toast_opened_finished": "🔓 Geöffnete Packung von {name} aufgebraucht!",
         "disambiguation_hint": "Was meinst du mit \"alles aufgebraucht\"?",
-        "disambiguation_all": "🗑️ ALLES aufgebraucht ({qty})"
+        "disambiguation_all": "🗑️ ALLES verbraucht ({qty})",
+        "error_exceeds_stock": "⚠️ Du kannst nicht mehr verwenden als du verfügbar hast!"
     },
     "product": {
         "title_new": "Neues Produkt",
@@ -691,7 +692,7 @@
         "item_added": "{name} hinzugefügt"
     },
     "antiwaste": {
-        "title": "🌱 Anti-Waste Report",
+        "title": "🌱 Anti-Verschwendungs-Bericht",
         "grade_label": "Note",
         "you": "Du",
         "avg_label": "Ø",

translations/en.json

@@ -241,7 +241,8 @@
         "toast_bring": "🛒 Product finished → added to Bring!",
         "toast_opened_finished": "🔓 Opened package of {name} finished!",
         "disambiguation_hint": "What do you mean by \"all done\"?",
-        "disambiguation_all": "🗑️ Finish EVERYTHING ({qty})"
+        "disambiguation_all": "🗑️ Finish EVERYTHING ({qty})",
+        "error_exceeds_stock": "⚠️ You cannot use more than you have available!"
     },
     "product": {
         "title_new": "New Product",

translations/it.json

@@ -241,7 +241,8 @@
         "toast_bring": "🛒 Prodotto finito → aggiunto a Bring!",
         "toast_opened_finished": "🔓 Confezione aperta di {name} finita!",
         "disambiguation_hint": "Cosa intendi con \"finito tutto\"?",
-        "disambiguation_all": "🗑️ Finito TUTTO ({qty})"
+        "disambiguation_all": "🗑️ Finito TUTTO ({qty})",
+        "error_exceeds_stock": "⚠️ Non puoi usare più di quanto hai disponibile!"
     },
     "product": {
         "title_new": "Nuovo Prodotto",
@@ -690,7 +691,7 @@
         "item_added": "{name} aggiunto"
     },
     "antiwaste": {
-        "title": "🌱 Anti-Waste Report",
+        "title": "🌱 Rapporto Anti-Spreco",
         "grade_label": "Voto",
         "you": "Tu",
         "avg_label": "Media",