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

assets/css/style.css

@@ -384,6 +384,14 @@ body {
     from { opacity: 0; transform: translateY(8px); }
     to { opacity: 1; transform: translateY(0); }
 }
+@keyframes inputShake {
+    0%, 100% { transform: translateX(0); }
+    20%       { transform: translateX(-6px); }
+    40%       { transform: translateX(6px); }
+    60%       { transform: translateX(-4px); }
+    80%       { transform: translateX(4px); }
+}
+.input-shake { animation: inputShake 0.5s ease; border-color: var(--danger, #ef4444) !important; }
 
 /* ===== PAGE HEADER ===== */
 .page-header {

assets/js/app.js

@@ -6739,7 +6739,23 @@ function adjustUseQty(direction) {
         }
     }
     val = Math.max(step, val + direction * step);
-    input.value = Math.round(val * 1000) / 1000;
+    val = Math.round(val * 1000) / 1000;
+
+    // Cap at max available at selected location (in current unit)
+    const selectedLoc = document.getElementById('use-location')?.value;
+    if (selectedLoc && _useCurrentItems.length > 0) {
+        const locItems = _useCurrentItems.filter(i => i.location === selectedLoc);
+        const maxQtyAtLoc = locItems.reduce((s, i) => s + parseFloat(i.quantity || 0), 0);
+        if (maxQtyAtLoc > 0) {
+            // Convert to sub-unit for comparison if needed
+            const maxInCurrentUnit = (_useConfMode && _useConfMode._activeUnit === 'sub')
+                ? maxQtyAtLoc * _useConfMode.packageSize
+                : maxQtyAtLoc;
+            val = Math.min(val, Math.round(maxInCurrentUnit * 1000) / 1000);
+        }
+    }
+
+    input.value = val;
     // Sync fraction button highlight if visible
     const newVal = parseFloat(input.value);
     document.querySelectorAll('#pz-fraction-btns .frac-btn').forEach(b => {
@@ -7235,12 +7251,8 @@ async function submitUse(e) {
     e.preventDefault();
     if (_useSubmitting) return; // prevent double-submit from scale auto-confirm
     _useSubmitting = true;
-    // Stop timers but KEEP _scaleLastConfirmedGrams: this prevents the scale from
-    // re-triggering another auto-submit while the product is still on the plate.
-    // (Calling _cancelScaleAutoConfirm(false) would reset the sentinel to null,
-    //  allowing the same weight to start a new 10-second cycle immediately.)
     _cancelScaleTimersOnly();
-    _scaleStabilityVal = null; // reset sentinel so a new DIFFERENT weight restarts correctly
+    _scaleStabilityVal = null;
     showLoading(true);
     try {
         let qty = parseFloat(document.getElementById('use-quantity').value) || 1;
@@ -7254,6 +7266,22 @@ async function submitUse(e) {
         } else if (_useConfMode && _useConfMode._activeUnit === 'conf') {
             displayUnit = 'conf';
         }
+
+        // ── Validate: cannot use more than available at selected location ─────────
+        const selectedLoc = document.getElementById('use-location').value;
+        const locItems = _useCurrentItems.filter(i => i.location === selectedLoc);
+        const maxQtyAtLoc = locItems.reduce((s, i) => s + parseFloat(i.quantity || 0), 0);
+        if (maxQtyAtLoc > 0 && qty > maxQtyAtLoc + 0.001) {
+            showLoading(false);
+            _useSubmitting = false;
+            showToast(t('use.error_exceeds_stock'), 'error');
+            // Shake the input to make it obvious
+            const inp = document.getElementById('use-quantity');
+            inp.classList.add('input-shake');
+            setTimeout(() => inp.classList.remove('input-shake'), 600);
+            return;
+        }
+        // ─────────────────────────────────────────────────────────────────────────
         
         const result = await api('inventory_use', {}, 'POST', {
             product_id: currentProduct.id,

index.html

@@ -1318,6 +1318,6 @@
     </div>
 </div>
 
-<script src="assets/js/app.js?v=20260504b"></script>
+<script src="assets/js/app.js?v=20260504c"></script>
 </body>
 </html>

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",