refactor: extract shared payment status sets to utility module

- Move PAID_STATUSES/FAILED_STATUSES from Balance.tsx and TopUpResult.tsx
  to src/utils/paymentStatus.ts
- Eliminates code duplication between the two pages

src/pages/Balance.tsx

@@ -13,6 +13,7 @@ import type { PaginatedResponse, Transaction } from '../types';
 import { Card } from '@/components/data-display/Card';
 import { Button } from '@/components/primitives/Button';
 import { staggerContainer, staggerItem } from '@/components/motion/transitions';
+import { isPaidStatus, isFailedStatus } from '../utils/paymentStatus';
 
 // Icons
 const ChevronDownIcon = ({ className = 'h-5 w-5' }: { className?: string }) => (
@@ -64,32 +65,10 @@ export default function Balance() {
     if (paymentHandledRef.current) return;
 
     const paymentStatus = searchParams.get('payment') || searchParams.get('status');
-    const paidSet = new Set([
-      'succeeded',
-      'success',
-      'paid',
-      'paid_over',
-      'overpaid',
-      'completed',
-      'confirmed',
-      'closed',
-    ]);
-    const failedSet = new Set([
-      'fail',
-      'failed',
-      'error',
-      'canceled',
-      'cancelled',
-      'declined',
-      'expired',
-      'cancel',
-      'system_fail',
-      'refund_paid',
-    ]);
 
     const normalised = paymentStatus?.toLowerCase() ?? '';
-    const isSuccess = paidSet.has(normalised) || searchParams.get('success') === 'true';
-    const isFailed = failedSet.has(normalised);
+    const isSuccess = isPaidStatus(normalised) || searchParams.get('success') === 'true';
+    const isFailed = isFailedStatus(normalised);
 
     if (isSuccess) {
       paymentHandledRef.current = true;

src/pages/TopUpResult.tsx

@@ -12,6 +12,7 @@ import { Spinner } from '@/components/ui/Spinner';
 import { AnimatedCheckmark } from '@/components/ui/AnimatedCheckmark';
 import { AnimatedCrossmark } from '@/components/ui/AnimatedCrossmark';
 import { loadTopUpPendingInfo, clearTopUpPendingInfo } from '../utils/topUpStorage';
+import { isPaidStatus, isFailedStatus } from '../utils/paymentStatus';
 
 // ── Constants ────────────────────────────────────────────────
 const MAX_POLL_MS = 10 * 60 * 1000; // 10 minutes
@@ -177,39 +178,6 @@ function TimeoutState({ onRetry, onGoBack }: { onRetry: () => void; onGoBack: ()
   );
 }
 
-// ── Determine paid status from provider-specific status strings ──
-const PAID_STATUSES = new Set([
-  'succeeded',
-  'success',
-  'paid',
-  'paid_over',
-  'overpaid',
-  'completed',
-  'confirmed',
-  'closed',
-]);
-
-const FAILED_STATUSES = new Set([
-  'fail',
-  'failed',
-  'error',
-  'canceled',
-  'cancelled',
-  'declined',
-  'expired',
-  'cancel',
-  'system_fail',
-  'refund_paid',
-]);
-
-function isPaidStatus(status: string): boolean {
-  return PAID_STATUSES.has(status.toLowerCase());
-}
-
-function isFailedStatus(status: string): boolean {
-  return FAILED_STATUSES.has(status.toLowerCase());
-}
-
 // ── Main Component ───────────────────────────────────────────
 
 export default function TopUpResult() {

src/utils/paymentStatus.ts

@@ -0,0 +1,31 @@
+export const PAID_STATUSES = new Set([
+  'succeeded',
+  'success',
+  'paid',
+  'paid_over',
+  'overpaid',
+  'completed',
+  'confirmed',
+  'closed',
+]);
+
+export const FAILED_STATUSES = new Set([
+  'fail',
+  'failed',
+  'error',
+  'canceled',
+  'cancelled',
+  'declined',
+  'expired',
+  'cancel',
+  'system_fail',
+  'refund_paid',
+]);
+
+export function isPaidStatus(status: string): boolean {
+  return PAID_STATUSES.has(status.toLowerCase());
+}
+
+export function isFailedStatus(status: string): boolean {
+  return FAILED_STATUSES.has(status.toLowerCase());
+}