feat: enhance purchase intentions with chat integration and offer tracking

- Added MongoDB chat/message integration for seller responses
- Improved seller response validation and default messaging
- Integrated automatic chat creation/update when responding to intentions
- Added highest custom offer fields to listing queries and models
- Enhanced listing data with top offer information for buyers

components/marketplace/CreateAdModal.tsx

@@ -139,7 +139,31 @@ export function CreateAdModal({ open, onOpenChange, onSuccess }: CreateAdModalPr
       const data = await response.json();
 
       if (!response.ok) {
-        setError(data.error || "Erro ao criar anúncio");
+        if (data?.details?.length) {
+          const fieldLabels: Record<string, string> = {
+            item_id: "Item",
+            item_id_unified: "Item",
+            item_name: "Nome do item",
+            quantity: "Quantidade",
+            server_name: "Servidor",
+            price_pix: "Preço PIX",
+            price_tibia_coins: "Preço Tibia Coins",
+            price_gold_coins: "Preço Gold Coins",
+            trade_item_id: "Item de troca",
+            trade_item_name: "Nome do item de troca",
+            trade_item_quantity: "Quantidade do item de troca",
+            auction_ends_at: "Término do leilão",
+          };
+
+          const validationMessages = data.details.map((detail: { field?: string; message?: string }) => {
+            const fieldLabel = detail.field ? fieldLabels[detail.field] || detail.field : "Campo";
+            return `${fieldLabel}: ${detail.message ?? "preenchimento obrigatório"}`;
+          });
+
+          setError(validationMessages.join(" "));
+        } else {
+          setError(data?.error || "Erro ao criar anúncio");
+        }
         setLoading(false);
         return;
       }