Fix: Add Thêm giỏ button to fallback AI search results

index.html

@@ -2628,7 +2628,10 @@ function _fallbackAISearch(query, container) {
   }
   if (!results.length) { container.innerHTML = '❌ Khong tim thay. Thử: "bep tu", "may hut mui"'; return; }
   container.innerHTML = '<div style="display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px">' +
-    results.map(function(p) { var idx = window.D.indexOf(p); return '<div class="pc" onclick="showDetail(' + idx + ')" style="cursor:pointer"><div class="pi" style="height:150px"><img src="' + p.image + '" alt="' + p.name + '"></div><div class="pb"><div class="pn">' + p.name + '</div><div class="pp">' + (p.price || '') + '</div></div></div>'; }).join('') + '</div>';
+    results.map(function(p) { var idx = window.D.indexOf(p); return '<div style="position:relative" onclick="showDetail(' + idx + ')">' +
+      '<div class="pc" style="cursor:pointer"><div class="pi" style="height:150px"><img src="' + p.image + '" alt="' + p.name + '"></div>' +
+      '<div class="pb"><div class="pn">' + p.name + '</div><div class="pp">' + (p.price || '') + '</div></div></div>' +
+      '<button onclick="event.stopPropagation();addToCart(' + idx + ');" style="position:absolute;top:8px;left:8px;background:var(--a);color:#fff;border:none;width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:.7rem;z-index:2"><i class="fas fa-cart-plus"></i></button></div>'; }).join('') + '</div>';
 }
 
 /**