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/ListingDetailsModal.tsx

@@ -61,6 +61,8 @@ interface Listing {
   image_url?: string | null;
   item_category?: string | null;
   seller_character_name?: string | null;
+  highest_custom_offer_amount?: number | string | null;
+  highest_custom_offer_currency?: string | null;
 }
 
 interface ListingDetailsModalProps {
@@ -165,14 +167,14 @@ export function ListingDetailsModal({
     if (listing.price_tibia_coins) {
       const price = typeof listing.price_tibia_coins === "string" ? parseInt(listing.price_tibia_coins, 10) : listing.price_tibia_coins;
       if (!isNaN(price)) {
-        prices.push({ type: "tc", label: "Tibia Coins", value: `${price.toLocaleString()} TC` });
+        prices.push({ type: "tibia_coins", label: "Tibia Coins", value: `${price.toLocaleString()} TC` });
       }
     }
 
     if (listing.price_gold_coins) {
       const price = typeof listing.price_gold_coins === "string" ? parseInt(listing.price_gold_coins, 10) : listing.price_gold_coins;
       if (!isNaN(price)) {
-        prices.push({ type: "gp", label: "Gold Coins", value: `${price.toLocaleString()} GP` });
+        prices.push({ type: "gold_coins", label: "Gold Coins", value: `${price.toLocaleString()} GP` });
       }
     }
 
@@ -188,6 +190,32 @@ export function ListingDetailsModal({
   };
 
   const prices = getAvailablePrices();
+  const highestOfferLabel = (() => {
+    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 registrada: R$ ${amount.toFixed(2)}`;
+      case "tibia_coins":
+        return `Maior oferta registrada: ${Math.round(amount).toLocaleString()} TC`;
+      case "gold_coins":
+        return `Maior oferta registrada: ${Math.round(amount).toLocaleString()} GP`;
+      default:
+        return `Maior oferta registrada: ${amount}`;
+    }
+  })();
   // Apenas o dono pode realizar ações
   const canPause = isOwner && listing.listing_status === "active";
   const canActivate = isOwner && listing.listing_status === "cancelled";
@@ -314,9 +342,9 @@ export function ListingDetailsModal({
                   className={`p-3 rounded-lg border ${
                     price.type === "pix"
                       ? "bg-green-500/10 border-green-500/20"
-                      : price.type === "tc"
+                      : price.type === "tibia_coins"
                         ? "bg-blue-500/10 border-blue-500/20"
-                        : price.type === "gp"
+                        : price.type === "gold_coins"
                           ? "bg-yellow-500/10 border-yellow-500/20"
                           : "bg-purple-500/10 border-purple-500/20"
                   }`}
@@ -326,6 +354,11 @@ export function ListingDetailsModal({
                 </div>
               ))}
             </div>
+            {highestOfferLabel && (
+              <div className="rounded-lg border border-primary/30 bg-primary/5 px-3 py-2 text-sm font-medium text-primary">
+                {highestOfferLabel}
+              </div>
+            )}
           </div>
 
           {/* Informações de leilão */}