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/AdCard.tsx

@@ -68,10 +68,12 @@ interface Listing {
   // Campo do vendedor
   seller_character_name?: string | null;
   has_pending_intention_for_current_user?: boolean;
+  highest_custom_offer_amount?: number | string | null;
+  highest_custom_offer_currency?: string | null;
 }
 
 interface PriceInfo {
-  type: "pix" | "tc" | "gp" | "trade";
+  type: "pix" | "tibia_coins" | "gold_coins" | "trade";
   label: string;
   value: string;
 }
@@ -227,7 +229,7 @@ export function AdCard({ listing, viewMode = "grid" }: AdCardProps) {
         : listing.price_tibia_coins;
       if (!isNaN(price)) {
         prices.push({
-          type: "tc",
+          type: "tibia_coins",
           label: "TC",
           value: `${price.toLocaleString()} TC`,
         });
@@ -241,7 +243,7 @@ export function AdCard({ listing, viewMode = "grid" }: AdCardProps) {
         : listing.price_gold_coins;
       if (!isNaN(price)) {
         prices.push({
-          type: "gp",
+          type: "gold_coins",
           label: "GP",
           value: `${price.toLocaleString()} GP`,
         });
@@ -266,6 +268,35 @@ export function AdCard({ listing, viewMode = "grid" }: AdCardProps) {
   const isSold = listing.listing_status === "sold";
   const hasPendingIntention = Boolean(listing.has_pending_intention_for_current_user);
 
+  const getHighestOfferLabel = () => {
+    if (
+      listing.highest_custom_offer_amount === null ||
+      listing.highest_custom_offer_amount === undefined ||
+      !listing.highest_custom_offer_currency
+    ) {
+      return null;
+    }
+    const amount =
+      typeof listing.highest_custom_offer_amount === "string"
+        ? Number(listing.highest_custom_offer_amount)
+        : listing.highest_custom_offer_amount;
+    if (Number.isNaN(amount)) {
+      return null;
+    }
+    switch (listing.highest_custom_offer_currency) {
+      case "pix":
+        return `Maior oferta: R$ ${amount.toFixed(2)}`;
+      case "tibia_coins":
+        return `Maior oferta: ${Math.round(amount).toLocaleString()} TC`;
+      case "gold_coins":
+        return `Maior oferta: ${Math.round(amount).toLocaleString()} GP`;
+      default:
+        return `Maior oferta: ${amount}`;
+    }
+  };
+
+  const highestOfferLabel = getHighestOfferLabel();
+
   // Função para obter URL da imagem do item
   const getItemImageUrl = (): string => {
     // Prioridade 1: image_url (URL externa) se disponível
@@ -327,9 +358,9 @@ export function AdCard({ listing, viewMode = "grid" }: AdCardProps) {
       switch (type) {
         case "pix":
           return "bg-green-100 hover:bg-green-200 dark:bg-green-900/30 dark:hover:bg-green-900/50 text-green-700 dark:text-green-300 border-green-300 dark:border-green-700";
-        case "tc":
+        case "tibia_coins":
           return "bg-blue-100 hover:bg-blue-200 dark:bg-blue-900/30 dark:hover:bg-blue-900/50 text-blue-700 dark:text-blue-300 border-blue-300 dark:border-blue-700";
-        case "gp":
+        case "gold_coins":
           return "bg-amber-100 hover:bg-amber-200 dark:bg-amber-900/30 dark:hover:bg-amber-900/50 text-amber-700 dark:text-amber-300 border-amber-300 dark:border-amber-700";
         case "trade":
           return "bg-purple-100 hover:bg-purple-200 dark:bg-purple-900/30 dark:hover:bg-purple-900/50 text-purple-700 dark:text-purple-300 border-purple-300 dark:border-purple-700";
@@ -342,8 +373,8 @@ export function AdCard({ listing, viewMode = "grid" }: AdCardProps) {
       switch (type) {
         case "pix":
           return <DollarSign className="h-3 w-3" />;
-        case "tc":
-        case "gp":
+        case "tibia_coins":
+        case "gold_coins":
           return <Coins className="h-3 w-3" />;
         case "trade":
           return <RefreshCw className="h-3 w-3" />;
@@ -554,7 +585,14 @@ export function AdCard({ listing, viewMode = "grid" }: AdCardProps) {
                     listing.is_featured && "p-2 rounded-lg border-l-4 bg-yellow-500/5 border-yellow-500",
                     "overflow-hidden"
                   )}>
-                    <PriceBadges prices={availablePrices} compact tradeItemImageUrl={tradeItemImageUrl} listing={listing} />
+                    <div className="space-y-1">
+                      <PriceBadges prices={availablePrices} compact tradeItemImageUrl={tradeItemImageUrl} listing={listing} />
+                      {highestOfferLabel && (
+                        <div className="text-xs font-medium text-primary/80">
+                          {highestOfferLabel}
+                        </div>
+                      )}
+                    </div>
                   </div>
                 )}
                 
@@ -846,7 +884,14 @@ export function AdCard({ listing, viewMode = "grid" }: AdCardProps) {
               listing.is_featured && "p-2 rounded-lg border-l-4 bg-yellow-500/5 border-yellow-500",
               "overflow-hidden"
             )}>
-              <PriceBadges prices={availablePrices} tradeItemImageUrl={tradeItemImageUrl} listing={listing} />
+              <div className="space-y-1">
+                <PriceBadges prices={availablePrices} tradeItemImageUrl={tradeItemImageUrl} listing={listing} />
+                {highestOfferLabel && (
+                  <div className="text-xs font-medium text-primary/80">
+                    {highestOfferLabel}
+                  </div>
+                )}
+              </div>
             </div>
           )}