feat(chat): unlock history after payment

src/stores/payment/index.ts

@@ -6,4 +6,5 @@ export * from "./payment-context";
 export * from "./payment-events";
 export * from "./payment-machine";
 export * from "./payment-machine.actors";
+export * from "./payment-success-sync";
 export * from "./payment-state";

src/stores/payment/payment-success-sync.tsx

@@ -0,0 +1,41 @@
+"use client";
+
+/**
+ * Payment → User / Chat 同步器
+ *
+ * 支付成功是跨模块事件：
+ * - User 需要重新拉取 profile + entitlements，刷新 isVip / creditBalance。
+ * - Chat 需要根据历史锁定消息数量决定直接解锁或弹窗确认。
+ */
+import { useEffect, useRef } from "react";
+
+import { useChatDispatch } from "@/stores/chat/chat-context";
+import { useUserDispatch } from "@/stores/user/user-context";
+
+import { usePaymentState } from "./payment-context";
+
+export function PaymentSuccessSync() {
+  const paymentState = usePaymentState();
+  const userDispatch = useUserDispatch();
+  const chatDispatch = useChatDispatch();
+  const lastPaidKeyRef = useRef<string | null>(null);
+
+  useEffect(() => {
+    if (!paymentState.isPaid || !paymentState.currentOrderId) return;
+
+    const paidKey = `${paymentState.currentOrderId}:${paymentState.orderStatus}`;
+    if (lastPaidKeyRef.current === paidKey) return;
+    lastPaidKeyRef.current = paidKey;
+
+    userDispatch({ type: "UserFetch" });
+    chatDispatch({ type: "ChatPaymentSucceeded" });
+  }, [
+    chatDispatch,
+    paymentState.currentOrderId,
+    paymentState.isPaid,
+    paymentState.orderStatus,
+    userDispatch,
+  ]);
+
+  return null;
+}