feat: integrate React Query for improved data fetching and state management across banking and transactions components

app/statistics/page.tsx

@@ -190,6 +190,7 @@ export default function StatisticsPage() {
   const stats = useMemo(() => {
     if (!data) return null;
 
+    // Pre-filter transactions once
     let transactions = data.transactions.filter((t) => {
       const transactionDate = new Date(t.date);
       if (endDate) {