feat: bottone 'Usa' per ogni ingrediente ricetta - scala dalla dispensa

- Backend: arricchisce risposta ricetta con product_id, location per ingredienti from_pantry
- Matching fuzzy nome ingrediente AI → prodotto inventario (exact/contains/word overlap)
- Frontend: bottone '📦 Usa' per ogni ingrediente catalogato in dispensa
- Click → chiama inventory_use API → scala 1 unità → feedback visivo (barrato + verde)
- Ingredienti non in dispensa (🛒) mostrati senza bottone

assets/css/style.css

@@ -2031,6 +2031,63 @@ body {
     line-height: 1.5;
 }
 
+/* Recipe ingredient use buttons */
+.recipe-ingredients {
+    list-style: none;
+    padding: 0;
+}
+
+.recipe-ingredient {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: 8px;
+    padding: 6px 0;
+    border-bottom: 1px solid var(--bg-light);
+}
+
+.recipe-ingredient:last-child {
+    border-bottom: none;
+}
+
+.recipe-ing-text {
+    flex: 1;
+    min-width: 0;
+    line-height: 1.4;
+}
+
+.btn-use-ingredient {
+    flex-shrink: 0;
+    background: var(--primary);
+    color: #fff;
+    border: none;
+    border-radius: var(--radius-sm);
+    padding: 4px 10px;
+    font-size: 0.78rem;
+    font-weight: 600;
+    cursor: pointer;
+    white-space: nowrap;
+    transition: background 0.2s, opacity 0.2s;
+}
+
+.btn-use-ingredient:active {
+    opacity: 0.7;
+}
+
+.btn-use-ingredient:disabled {
+    cursor: default;
+    opacity: 0.6;
+}
+
+.btn-use-ingredient.btn-used {
+    background: var(--success);
+}
+
+.recipe-ing-used .recipe-ing-text {
+    text-decoration: line-through;
+    opacity: 0.5;
+}
+
 /* ===== AI IDENTIFICATION RESULTS ===== */
 .ai-identified-card {
     background: var(--bg-light);