fix(private-room): preserve payment return route

src/app/subscription/page.tsx

@@ -6,6 +6,7 @@ import {
 import {
   getFirstPaymentSearchParam,
   parsePaymentReturnSearchParams,
+  parseSubscriptionReturnTo,
   type PaymentSearchParams,
 } from "@/lib/payment/payment_search_params";
 
@@ -38,7 +39,7 @@ export default async function SubscriptionPage({
     <SubscriptionScreen
       subscriptionType={subscriptionType}
       shouldResumePendingOrder={paymentReturn.shouldResumePendingOrder}
-      returnTo={toReturnTo(getFirstPaymentSearchParam(query.returnTo))}
+      returnTo={parseSubscriptionReturnTo(query.returnTo)}
       initialPayChannel={paymentReturn.initialPayChannel}
       analyticsContext={analyticsContext}
     />
@@ -48,7 +49,3 @@ export default async function SubscriptionPage({
 function toSubscriptionType(value: string | null): SubscriptionType {
   return value === "topup" ? "topup" : "vip";
 }
-
-function toReturnTo(value: string | null): "chat" | null {
-  return value === "chat" ? "chat" : null;
-}