feat: Prevent duplicate event processing in useMarket composable

- Introduce a Set to track processed event IDs, ensuring that each event is handled only once.
- Update event handling logic to skip already processed events, improving efficiency and data integrity.

src/composables/useMarket.ts

@@ -19,6 +19,9 @@ export function useMarket() {
   const isLoading = ref(false)
   const isConnected = ref(false)
   
+  // Track processed event IDs to prevent duplicates (like nostr-market-app)
+  const processedEventIds = new Set<string>()
+  
   // Market loading state
   const loadMarket = async (naddr: string) => {
     try {
@@ -403,6 +406,10 @@ export function useMarket() {
   }
   
   const handleMarketEvent = (event: any) => {
+    // Skip if already processed
+    if (processedEventIds.has(event.id)) return
+    processedEventIds.add(event.id)
+    
     try {
       switch (event.kind) {
         case MARKET_EVENT_KINDS.STALL: