Improve mobile data retrieval and state management

- Add race protection and packId normalization to swipe screen
- Add loading/error states to matchStore with couple_id filter
- Sync per-match unread counts in realtime
- Use useFocusEffect for data freshness on Home screen
- Wire RefreshControl to actual loading state on Matches

🤖 Generated with [Claude Code](https://claude.com/claude-code)

apps/mobile/src/store/index.ts

@@ -4,3 +4,5 @@ export { useMatchStore } from "./matchStore";
 export { usePacksStore } from "./packsStore";
 export { useMessageStore } from "./messageStore";
 export { useSubscriptionStore } from "./subscriptionStore";
+export { useResponsesStore, groupResponses } from "./responsesStore";
+export type { ResponseWithQuestion, UpdateResponseResult, GroupByOption } from "./responsesStore";