fix(private-room): preserve payment return route

src/app/subscription/use-subscription-payment-flow.ts

@@ -5,13 +5,14 @@ import { useEffect, useRef, useState } from "react";
 import { usePaymentRouteFlow } from "@/app/_hooks/use-payment-route-flow";
 import { useAppNavigator } from "@/router/use-app-navigator";
 import type { PayChannel } from "@/data/dto/payment";
+import type { SubscriptionReturnTo } from "@/lib/navigation/subscription_exit";
 
 import type { SubscriptionType } from "./subscription-screen.helpers";
 
 export interface UseSubscriptionPaymentFlowInput {
   subscriptionType: SubscriptionType;
   shouldResumePendingOrder: boolean;
-  returnTo: "chat" | null;
+  returnTo: SubscriptionReturnTo;
   initialPayChannel: PayChannel;
 }