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/MyPurchaseIntentionsPanel.tsx

@@ -133,6 +133,23 @@ function formatPrice(price: number | null, method: string): string {
   return price.toLocaleString("pt-BR");
 }
 
+function formatCustomOffer(amount: number | null | undefined, currency: string | null | undefined): string | null {
+  if (amount === null || amount === undefined || !currency) {
+    return null;
+  }
+
+  switch (currency) {
+    case "pix":
+      return `R$ ${amount.toFixed(2)}`;
+    case "tibia_coins":
+      return `${Math.round(amount).toLocaleString("pt-BR")} TC`;
+    case "gold_coins":
+      return `${Math.round(amount).toLocaleString("pt-BR")} GP`;
+    default:
+      return amount.toLocaleString("pt-BR");
+  }
+}
+
 interface IntentionCardProps {
   intention: PurchaseIntention;
   locale?: string;
@@ -213,6 +230,10 @@ function IntentionCard({ intention, locale = "pt" }: IntentionCardProps) {
     : listing.price_gold_coins && intention.payment_method === "gold_coins"
     ? listing.price_gold_coins
     : null;
+  const customOfferLabel = formatCustomOffer(
+    typeof intention.custom_offer_amount === "number" ? intention.custom_offer_amount : null,
+    intention.custom_offer_currency ?? null
+  );
 
   return (
     <>
@@ -256,6 +277,13 @@ function IntentionCard({ intention, locale = "pt" }: IntentionCardProps) {
                     </span>
                   )}
                 </div>
+                {customOfferLabel && (
+                  <div className="flex items-center gap-1 text-foreground">
+                    <Badge variant="outline" className="border-primary text-primary">
+                      Sua oferta: {customOfferLabel}
+                    </Badge>
+                  </div>
+                )}
               </div>
             </div>
           </div>
@@ -496,10 +524,7 @@ interface MyPurchaseIntentionsPanelProps {
 export function MyPurchaseIntentionsPanel({ locale = "pt" }: MyPurchaseIntentionsPanelProps) {
   const { user } = useSession();
   const [filter, setFilter] = useState<PurchaseIntentionStatus | "all">("all");
-  
-  const { intentions, isLoading, refetch } = useMyPurchaseIntentions(
-    filter === "all" ? undefined : filter
-  );
+  const { intentions, isLoading } = useMyPurchaseIntentions();
 
   // Contar por status
   const pendingCount = intentions.filter((i) => i.status === "pending").length;
@@ -507,6 +532,10 @@ export function MyPurchaseIntentionsPanel({ locale = "pt" }: MyPurchaseIntention
   const rejectedCount = intentions.filter((i) => i.status === "rejected").length;
   const expiredCount = intentions.filter((i) => i.status === "expired").length;
   const completedCount = intentions.filter((i) => i.status === "completed").length;
+  const filteredIntentions =
+    filter === "all"
+      ? intentions
+      : intentions.filter((intention) => intention.status === filter);
 
   if (!user) {
     return (
@@ -582,7 +611,7 @@ export function MyPurchaseIntentionsPanel({ locale = "pt" }: MyPurchaseIntention
             <Skeleton key={i} className="h-48 w-full" />
           ))}
         </div>
-      ) : intentions.length === 0 ? (
+      ) : filteredIntentions.length === 0 ? (
         <div className="text-center py-12 border rounded-lg">
           <ShoppingCart className="h-12 w-12 mx-auto mb-4 text-muted-foreground opacity-50" />
           <p className="text-lg font-medium mb-2">Nenhuma intenção de compra encontrada</p>
@@ -597,7 +626,7 @@ export function MyPurchaseIntentionsPanel({ locale = "pt" }: MyPurchaseIntention
         </div>
       ) : (
         <div className="space-y-4">
-          {intentions.map((intention) => (
+          {filteredIntentions.map((intention) => (
             <IntentionCard key={intention.intention_id} intention={intention} locale={locale} />
           ))}
         </div>