feat(market-card.tsx): add display of user who created the market card for better user experience and context

fix(index.ts): add user_created property to storeComponent type to match the API response structure

src/frontend/src/pages/StorePage/components/market-card.tsx

@@ -174,6 +174,9 @@ export const MarketCardComponent = ({
           <CardDescription className="pb-2 pt-2">
             <div className="truncate-doubleline">{data.description}</div>
           </CardDescription>
+          <span className="flex items-center gap-1.5 text-xs text-foreground">
+            Created by: {data.user_created?.first_name}
+          </span>
         </CardHeader>
       </div>
 

src/frontend/src/types/store/index.ts

@@ -8,6 +8,7 @@ export type storeComponent = {
   description: string;
   liked_by_count: number;
   liked_by_user?: boolean;
+  user_created: { first_name: string };
 };
 
 export type StoreComponentResponse = {