fix: Improve loading state management in useMarket and Market.vue

- Update useMarket composable to set loading state in marketStore during market loading.
- Refine loading condition in Market.vue to only check marketStore.isLoading, enhancing clarity and performance.

src/composables/useMarket.ts

@@ -24,6 +24,7 @@ export function useMarket() {
   const loadMarket = async (naddr: string) => {
     try {
       isLoading.value = true
+      marketStore.setLoading(true)
       error.value = null
       
       console.log('Loading market with naddr:', naddr)
@@ -45,6 +46,7 @@ export function useMarket() {
       // Don't throw error, let the UI handle it gracefully
     } finally {
       isLoading.value = false
+      marketStore.setLoading(false)
     }
   }