refactor: Simplify useMarket composable by removing unused client references and improving parameter naming

- Eliminate unnecessary Nostr client retrieval in publishProduct and publishStall functions.
- Update parameter names in event processing functions for clarity, using underscores for unused parameters.
- Clean up imports in useMarket.ts to streamline the codebase.

src/lib/nostr/client.ts

@@ -219,7 +219,7 @@ export class NostrClient {
     since?: number
     until?: number
     '#d'?: string[]
-  } = {}): Promise<Event[]> {
+  }): Promise<Event[]> {
     const {
       kinds,
       authors,