feat(market): add Minha Intenções tab with panel, hook, and badge

- Introduced "Minhas Intenções" tab visible only to logged-in users.
- Integrated MyPurchaseIntentionsPanel and useMyPurchaseIntentions hook.
- Added tab badge showing count of pending intentions.
- Extended session API to include user’s main character for downstream features.

app/api/listings/route.ts

@@ -13,6 +13,7 @@ import {
   getActiveListings,
 } from "@/lib/prisma/queries/listings";
 import { isServerActive } from "@/lib/prisma/queries/servers";
+import { getPendingIntentionListingIdsForBuyer } from "@/lib/prisma/queries/purchase-intentions";
 
 /**
  * GET /api/listings
@@ -20,6 +21,7 @@ import { isServerActive } from "@/lib/prisma/queries/servers";
  */
 export async function GET(request: NextRequest) {
   try {
+    const auth = await optionalAuth(request);
     const { searchParams } = new URL(request.url);
 
     const filters = {
@@ -65,10 +67,26 @@ export async function GET(request: NextRequest) {
       ? await getListings(filters)
       : await getActiveListings(filters);
 
+    let listingsResponse = listingsData.listings;
+
+    if (auth && listingsResponse.length > 0) {
+      const listingIds = listingsResponse.map((listing) => listing.listing_id);
+      const pendingListingIds = await getPendingIntentionListingIdsForBuyer(
+        auth.userId,
+        listingIds
+      );
+      const pendingSet = new Set(pendingListingIds);
+
+      listingsResponse = listingsResponse.map((listing) => ({
+        ...listing,
+        has_pending_intention_for_current_user: pendingSet.has(listing.listing_id),
+      }));
+    }
+
     return NextResponse.json(
       {
         success: true,
-        listings: listingsData.listings,
+        listings: listingsResponse,
         pagination: {
           page: filters.page,
           pageSize: filters.pageSize,