refactor(router): introduce app navigation manager

src/app/chat/chat-screen.helpers.ts

@@ -1,8 +1,6 @@
 "use client";
 
 import type { LoginStatus } from "@/data/dto/auth";
-import type { PayChannel } from "@/data/dto/payment";
-import { ROUTE_BUILDERS } from "@/router/routes";
 import { AppEnvUtil, BrowserDetector } from "@/utils";
 
 export interface ExternalBrowserPromptState {
@@ -31,41 +29,8 @@ export function shouldStartExternalBrowserPrompt({
   );
 }
 
-export function getChatPaywallSubscriptionUrl(
-  payChannel: PayChannel = "stripe",
-): string {
-  return ROUTE_BUILDERS.subscription("vip", {
-    payChannel,
-    returnTo: "chat",
-  });
-}
-
-export function getChatCreditsTopUpSubscriptionUrl(
-  payChannel: PayChannel = "stripe",
-): string {
-  return ROUTE_BUILDERS.subscription("topup", {
-    payChannel,
-    returnTo: "chat",
-  });
-}
-
 export function getInsufficientCreditsSubscriptionType(
   isVip: boolean,
 ): "vip" | "topup" {
   return isVip ? "topup" : "vip";
 }
-
-export function getChatPaywallNavigationUrl(
-  loginStatus: LoginStatus,
-  type: "vip" | "topup" = "vip",
-  payChannel: PayChannel = "stripe",
-): string {
-  const subscriptionUrl =
-    type === "topup"
-      ? getChatCreditsTopUpSubscriptionUrl(payChannel)
-      : getChatPaywallSubscriptionUrl(payChannel);
-  if (deriveIsGuest(loginStatus)) {
-    return ROUTE_BUILDERS.authWithRedirect(subscriptionUrl);
-  }
-  return subscriptionUrl;
-}

src/app/chat/chat-screen.tsx

@@ -2,18 +2,17 @@
 
 import { useEffect, useRef, useState } from "react";
 import Image from "next/image";
-import { useRouter } from "next/navigation";
 
 import { useAuthState } from "@/stores/auth/auth-context";
 import { useChatDispatch, useChatState } from "@/stores/chat/chat-context";
 import { useUserState } from "@/stores/user/user-context";
 import { ROUTES } from "@/router/routes";
+import { useAppNavigator } from "@/router/use-app-navigator";
 import {
   openChatInExternalBrowser,
   recordExternalBrowserPromptShown,
   resolveExternalBrowserPromptEligibility,
 } from "@/lib/chat/chat_external_browser";
-import { getDefaultPayChannelForCountryCode } from "@/lib/payment/default_pay_channel";
 
 import { MobileShell } from "@/app/_components/core";
 
@@ -31,7 +30,6 @@ import {
 } from "./components";
 import {
   deriveIsGuest,
-  getChatPaywallNavigationUrl,
   getInsufficientCreditsSubscriptionType,
   isChatDevelopmentEnvironment,
   shouldStartExternalBrowserPrompt,
@@ -45,7 +43,7 @@ export function ChatScreen() {
   const chatDispatch = useChatDispatch();
   const authState = useAuthState();
   const userState = useUserState();
-  const router = useRouter();
+  const navigator = useAppNavigator();
   const [showExternalBrowserDialog, setShowExternalBrowserDialog] =
     useState(false);
   const {
@@ -122,16 +120,10 @@ export function ChatScreen() {
   }
 
   function handleMessageLimitUnlock(): void {
-    const defaultPayChannel = getDefaultPayChannelForCountryCode(
+    navigator.openSubscription({
-      userState.currentUser?.countryCode,
+      type: getInsufficientCreditsSubscriptionType(userState.isVip),
-    );
+      returnTo: "chat",
-    router.push(
+    });
-      getChatPaywallNavigationUrl(
-        authState.loginStatus,
-        getInsufficientCreditsSubscriptionType(userState.isVip),
-        defaultPayChannel,
-      ),
-    );
   }
 
   function handleUnlockVoiceMessage(messageId: string): void {

src/app/chat/components/chat-header.tsx

@@ -7,9 +7,9 @@
  */
 import type { ReactNode } from "react";
 import { Lock, Menu } from "lucide-react";
-import { useRouter } from "next/navigation";
 
 import { ROUTES } from "@/router/routes";
+import { useAppNavigator } from "@/router/use-app-navigator";
 
 import styles from "./chat-header.module.css";
 
@@ -19,7 +19,7 @@ export interface ChatHeaderProps {
 }
 
 export function ChatHeader({ isGuest, offerBanner }: ChatHeaderProps) {
-  const router = useRouter();
+  const navigator = useAppNavigator();
 
   if (isGuest) {
     return (
@@ -27,7 +27,7 @@ export function ChatHeader({ isGuest, offerBanner }: ChatHeaderProps) {
         <button
           type="button"
           className={styles.guestBanner}
-          onClick={() => router.push(ROUTES.auth)}
+          onClick={() => navigator.openAuth(ROUTES.chat)}
           aria-label="Sign up to unlock more features"
         >
           <Lock className={styles.guestBannerIcon} size={16} aria-hidden="true" />
@@ -46,7 +46,7 @@ export function ChatHeader({ isGuest, offerBanner }: ChatHeaderProps) {
         <button
           type="button"
           className={styles.menuButton}
-          onClick={() => router.push(ROUTES.sidebar)}
+          onClick={() => navigator.push(ROUTES.sidebar)}
           aria-label="Menu"
         >
           <Menu className={styles.menuIcon} size={24} aria-hidden="true" />

src/app/chat/components/chat-insufficient-credits-banner.tsx

@@ -16,9 +16,7 @@
  * 不做的事：
  *   - 不直接管理 state machine（chat 机器不感知 UI 层）
  */
-import { useRouter } from "next/navigation";
+import { useAppNavigator } from "@/router/use-app-navigator";
-
-import { ROUTE_BUILDERS } from "@/router/routes";
 
 import styles from "./chat-insufficient-credits-banner.module.css";
 
@@ -26,7 +24,7 @@ export interface ChatInsufficientCreditsBannerProps {
   title?: string;
   ctaLabel?: string;
   /**
-   * 自定义点击回调（不传则默认 router.push(topup subscription)）
+   * 自定义点击回调（不传则默认走统一订阅导航）
    * - 测试时可传 mock
    * - 嵌入其他场景时（如 nested overlay）可传自定义
    */
@@ -38,7 +36,7 @@ export function ChatInsufficientCreditsBanner({
   ctaLabel = "Top up credits to continue",
   onUnlock,
 }: ChatInsufficientCreditsBannerProps) {
-  const router = useRouter();
+  const navigator = useAppNavigator();
   const titleLines = title.split("\n");
 
   const handleClick = () => {
@@ -46,7 +44,7 @@ export function ChatInsufficientCreditsBanner({
       onUnlock();
       return;
     }
-    router.push(ROUTE_BUILDERS.subscription("topup"));
+    navigator.openSubscription({ type: "topup", returnTo: "chat" });
   };
 
   return (

src/app/chat/hooks/use-chat-unlock-navigation-flow.ts

@@ -1,21 +1,17 @@
 "use client";
 
 import { useEffect } from "react";
-import { useRouter } from "next/navigation";
 
-import { ROUTE_BUILDERS } from "@/router/routes";
-import { useAuthState } from "@/stores/auth/auth-context";
-import { useChatDispatch, useChatState } from "@/stores/chat/chat-context";
-import type { ChatUnlockPaywallRequest } from "@/stores/chat/chat-state";
-import { useUserState } from "@/stores/user/user-context";
 import {
   consumePendingChatUnlock,
   peekPendingChatUnlock,
-  savePendingChatUnlock,
   type PendingChatUnlock,
   type PendingChatUnlockKind,
 } from "@/lib/navigation/chat_unlock_session";
-import { getDefaultPayChannelForCountryCode } from "@/lib/payment/default_pay_channel";
+import { useAppNavigator } from "@/router/use-app-navigator";
+import { useChatDispatch, useChatState } from "@/stores/chat/chat-context";
+import type { ChatUnlockPaywallRequest } from "@/stores/chat/chat-state";
+import { useUserState } from "@/stores/user/user-context";
 
 import { getInsufficientCreditsSubscriptionType } from "../chat-screen.helpers";
 
@@ -40,14 +36,10 @@ export function useChatUnlockNavigationFlow({
   expectedKind,
   expectedMessageId,
 }: UseChatUnlockNavigationFlowInput): UseChatUnlockNavigationFlowOutput {
-  const router = useRouter();
+  const navigator = useAppNavigator();
-  const authState = useAuthState();
   const userState = useUserState();
   const chatState = useChatState();
   const chatDispatch = useChatDispatch();
-  const isAuthenticatedUser =
-    authState.loginStatus !== "notLoggedIn" &&
-    authState.loginStatus !== "guest";
   const unlockPaywallRequest = getScopedUnlockPaywallRequest({
     request: chatState.unlockPaywallRequest,
     expectedKind,
@@ -55,7 +47,7 @@ export function useChatUnlockNavigationFlow({
   });
 
   useEffect(() => {
-    if (!chatState.historyLoaded || !isAuthenticatedUser) return;
+    if (!chatState.historyLoaded || !navigator.isAuthenticatedUser) return;
 
     let cancelled = false;
 
@@ -93,7 +85,7 @@ export function useChatUnlockNavigationFlow({
     chatState.historyLoaded,
     expectedKind,
     expectedMessageId,
-    isAuthenticatedUser,
+    navigator.isAuthenticatedUser,
     returnUrl,
   ]);
 
@@ -101,23 +93,17 @@ export function useChatUnlockNavigationFlow({
     messageId: string,
     kind: PendingChatUnlockKind,
   ): void {
-    if (!isAuthenticatedUser) {
+    navigator.startMessageUnlock({
-      void (async () => {
-        await savePendingChatUnlock({
-          messageId,
-          kind,
-          returnUrl,
-          stage: "auth",
-        });
-        router.push(ROUTE_BUILDERS.authWithRedirect(returnUrl));
-      })();
-      return;
-    }
-
-    chatDispatch({
-      type: "ChatUnlockMessageRequested",
       messageId,
       kind,
+      returnUrl,
+      onAuthenticated: () => {
+        chatDispatch({
+          type: "ChatUnlockMessageRequested",
+          messageId,
+          kind,
+        });
+      },
     });
   }
 
@@ -128,24 +114,13 @@ export function useChatUnlockNavigationFlow({
   function confirmInsufficientCreditsDialog(): void {
     if (!unlockPaywallRequest) return;
 
-    void (async () => {
+    chatDispatch({ type: "ChatUnlockPaywallNavigationConsumed" });
-      await savePendingChatUnlock({
+    navigator.openSubscriptionForPendingUnlock({
-        messageId: unlockPaywallRequest.messageId,
+      messageId: unlockPaywallRequest.messageId,
-        kind: unlockPaywallRequest.kind,
+      kind: unlockPaywallRequest.kind,
-        returnUrl,
+      returnUrl,
-        stage: "payment",
+      type: getInsufficientCreditsSubscriptionType(userState.isVip),
-      });
+    });
-      chatDispatch({ type: "ChatUnlockPaywallNavigationConsumed" });
-      const defaultPayChannel = getDefaultPayChannelForCountryCode(
-        userState.currentUser?.countryCode,
-      );
-      router.push(
-        ROUTE_BUILDERS.subscription(
-          getInsufficientCreditsSubscriptionType(userState.isVip),
-          { payChannel: defaultPayChannel, returnTo: "chat" },
-        ),
-      );
-    })();
   }
 
   return {

src/app/chat/hooks/use-first-recharge-offer-banner.ts

@@ -1,10 +1,9 @@
 "use client";
 
 import { useEffect, useState } from "react";
-import { useRouter } from "next/navigation";
 
 import type { LoginStatus } from "@/data/dto/auth";
-import { ROUTE_BUILDERS } from "@/router/routes";
+import { useAppNavigator } from "@/router/use-app-navigator";
 import { usePaymentDispatch, usePaymentState } from "@/stores/payment";
 import { useUserState } from "@/stores/user/user-context";
 import { getDefaultPayChannelForCountryCode } from "@/lib/payment/default_pay_channel";
@@ -55,7 +54,7 @@ export function useFirstRechargeOfferBanner({
   historyLoaded,
   loginStatus,
 }: UseFirstRechargeOfferBannerInput): UseFirstRechargeOfferBannerOutput {
-  const router = useRouter();
+  const navigator = useAppNavigator();
   const payment = usePaymentState();
   const paymentDispatch = usePaymentDispatch();
   const userState = useUserState();
@@ -127,15 +126,7 @@ export function useFirstRechargeOfferBanner({
   }
 
   function claim(): void {
-    const defaultPayChannel = getDefaultPayChannelForCountryCode(
+    navigator.openSubscription({ type: "vip", returnTo: "chat" });
-      userState.currentUser?.countryCode,
-    );
-    router.push(
-      ROUTE_BUILDERS.subscription("vip", {
-        payChannel: defaultPayChannel,
-        returnTo: "chat",
-      }),
-    );
   }
 
   return {

src/app/sidebar/sidebar-screen.tsx

@@ -3,12 +3,11 @@
 import { useEffect } from "react";
 import { LogOut } from "lucide-react";
 import { signOut } from "next-auth/react";
-import { useRouter } from "next/navigation";
 
 import { BackButton } from "@/app/_components";
 import { MobileShell } from "@/app/_components/core";
-import { getDefaultPayChannelForCountryCode } from "@/lib/payment/default_pay_channel";
+import { ROUTES } from "@/router/routes";
-import { ROUTE_BUILDERS, ROUTES } from "@/router/routes";
+import { useAppNavigator } from "@/router/use-app-navigator";
 import { useAuthDispatch, useAuthState } from "@/stores/auth/auth-context";
 import { useUserDispatch, useUserState } from "@/stores/user/user-context";
 
@@ -23,7 +22,7 @@ import styles from "./components/sidebar-screen.module.css";
 const FALLBACK_USERNAME = "User name";
 
 export function SidebarScreen() {
-  const router = useRouter();
+  const navigator = useAppNavigator();
   const user = useUserState();
   const userDispatch = useUserDispatch();
   const auth = useAuthState();
@@ -60,16 +59,6 @@ export function SidebarScreen() {
 
   const name = user.currentUser?.username ?? FALLBACK_USERNAME;
   const avatarUrl = user.avatarUrl ?? user.currentUser?.avatarUrl ?? null;
-  const defaultPayChannel = getDefaultPayChannelForCountryCode(
-    user.currentUser?.countryCode,
-  );
-  const vipSubscriptionUrl = ROUTE_BUILDERS.subscription("vip", {
-    payChannel: defaultPayChannel,
-  });
-  const topUpSubscriptionUrl = ROUTE_BUILDERS.subscription("topup", {
-    payChannel: defaultPayChannel,
-  });
-
   return (
     <MobileShell background="#fcf3f4">
       <div className={styles.shell}>
@@ -86,7 +75,7 @@ export function SidebarScreen() {
             name={name}
             avatarUrl={avatarUrl}
             isLoading={isInitializingUser}
-            onLoginClick={() => router.push(ROUTES.auth)}
+            onLoginClick={() => navigator.openAuth(ROUTES.sidebar)}
           />
         </section>
 
@@ -96,10 +85,10 @@ export function SidebarScreen() {
             onActivateVip={
               sidebarState === "vip"
                 ? undefined
-                : () => router.push(vipSubscriptionUrl)
+                : () => navigator.openSubscription({ type: "vip" })
             }
-            onTopUp={() => router.push(topUpSubscriptionUrl)}
+            onTopUp={() => navigator.openSubscription({ type: "topup" })}
-            onRulesClick={() => router.push(ROUTES.coinsRules)}
+            onRulesClick={() => navigator.push(ROUTES.coinsRules)}
           />
         </section>
 

src/data/storage/index.ts

@@ -17,6 +17,7 @@ export * from "./chat/chat_storage";
 export * from "./chat/local_chat_db";
 export * from "./chat/local_chat_storage";
 export * from "./chat/local_message";
+export * from "./navigation/navigation_storage";
 export * from "./payment/pending_payment_order_storage";
 export * from "./user/iuser_storage";
 export * from "./user/user_storage";

src/data/storage/navigation/__tests__/navigation_storage.test.ts

@@ -0,0 +1,71 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { createStorage } from "unstorage";
+import memoryDriver from "unstorage/drivers/memory";
+
+import { SessionAsyncUtil } from "@/utils";
+
+import { NavigationStorage } from "../navigation_storage";
+
+describe("NavigationStorage", () => {
+  beforeEach(() => {
+    SessionAsyncUtil.setStorage(createStorage({ driver: memoryDriver() }));
+    vi.useRealTimers();
+  });
+
+  it("saves, peeks, and consumes pending chat unlock sessions", async () => {
+    await NavigationStorage.savePendingChatUnlock({
+      messageId: "msg_1",
+      kind: "image",
+      returnUrl: "/chat/image/msg_1",
+      stage: "payment",
+    });
+
+    await expect(NavigationStorage.peekPendingChatUnlock()).resolves.toMatchObject({
+      messageId: "msg_1",
+      kind: "image",
+      returnUrl: "/chat/image/msg_1",
+      stage: "payment",
+    });
+
+    await expect(
+      NavigationStorage.consumePendingChatUnlock(),
+    ).resolves.toMatchObject({
+      messageId: "msg_1",
+      kind: "image",
+    });
+    await expect(NavigationStorage.peekPendingChatUnlock()).resolves.toBeNull();
+  });
+
+  it("drops expired pending chat unlock sessions", async () => {
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date("2026-07-03T00:00:00.000Z"));
+
+    await NavigationStorage.savePendingChatUnlock({
+      messageId: "msg_1",
+      kind: "private",
+      returnUrl: "/chat",
+      stage: "auth",
+    });
+
+    vi.setSystemTime(new Date("2026-07-03T00:31:00.000Z"));
+
+    await expect(NavigationStorage.peekPendingChatUnlock()).resolves.toBeNull();
+  });
+
+  it("saves and consumes pending chat image return sessions", async () => {
+    await NavigationStorage.savePendingChatImageReturn({
+      messageId: "msg_1",
+      returnUrl: "/chat/image/msg_1",
+    });
+
+    await expect(
+      NavigationStorage.consumePendingChatImageReturn(),
+    ).resolves.toMatchObject({
+      messageId: "msg_1",
+      returnUrl: "/chat/image/msg_1",
+    });
+    await expect(
+      NavigationStorage.consumePendingChatImageReturn(),
+    ).resolves.toBeNull();
+  });
+});

src/data/storage/navigation/index.ts

@@ -0,0 +1 @@
+export * from "./navigation_storage";

src/data/storage/navigation/navigation_storage.ts

@@ -0,0 +1,150 @@
+"use client";
+
+import { z } from "zod";
+
+import { StorageKeys } from "@/data/storage/storage_keys";
+import { Result, SessionAsyncUtil } from "@/utils";
+
+const MAX_AGE_MS = 30 * 60 * 1000;
+
+export type PendingChatUnlockKind = "private" | "voice" | "image";
+export type PendingChatUnlockStage = "auth" | "payment";
+
+const PendingChatUnlockSchema = z.object({
+  reason: z.literal("single_message_unlock"),
+  messageId: z.string().min(1),
+  kind: z.enum(["private", "voice", "image"]),
+  returnUrl: z
+    .string()
+    .min(1)
+    .refine(
+      (value) => value.startsWith("/") && !value.startsWith("//"),
+      "returnUrl must be an internal route",
+    ),
+  stage: z.enum(["auth", "payment"]),
+  createdAt: z.number(),
+});
+
+const PendingChatImageReturnSchema = z.object({
+  reason: z.literal("image_paywall"),
+  messageId: z.string().min(1),
+  returnUrl: z
+    .string()
+    .min(1)
+    .refine(
+      (value) => value.startsWith("/") && !value.startsWith("//"),
+      "returnUrl must be an internal route",
+    ),
+  createdAt: z.number(),
+});
+
+export type PendingChatUnlock = z.output<typeof PendingChatUnlockSchema>;
+export type PendingChatImageReturn = z.output<
+  typeof PendingChatImageReturnSchema
+>;
+
+/**
+ * NavigationStorage owns short-lived cross-route sessions.
+ *
+ * UI / router code should not touch the raw session storage utility directly.
+ * Keeping these payloads here makes auth, payment, and chat return flows
+ * testable without spreading storage keys across screens.
+ */
+export class NavigationStorage {
+  private constructor() {}
+
+  static async savePendingChatUnlock(input: {
+    messageId: string;
+    kind: PendingChatUnlockKind;
+    returnUrl: string;
+    stage: PendingChatUnlockStage;
+  }): Promise<void> {
+    const payload: PendingChatUnlock = {
+      reason: "single_message_unlock",
+      messageId: input.messageId,
+      kind: input.kind,
+      returnUrl: input.returnUrl,
+      stage: input.stage,
+      createdAt: Date.now(),
+    };
+    await SessionAsyncUtil.setJson(
+      StorageKeys.pendingChatUnlock,
+      payload,
+      PendingChatUnlockSchema,
+    );
+  }
+
+  static async consumePendingChatUnlock(): Promise<PendingChatUnlock | null> {
+    const result = await SessionAsyncUtil.getJson(
+      StorageKeys.pendingChatUnlock,
+      PendingChatUnlockSchema,
+    );
+    await SessionAsyncUtil.remove(StorageKeys.pendingChatUnlock);
+    if (Result.isErr(result)) return null;
+    return NavigationStorage.parsePendingChatUnlock(result.data);
+  }
+
+  static async peekPendingChatUnlock(): Promise<PendingChatUnlock | null> {
+    const result = await SessionAsyncUtil.getJson(
+      StorageKeys.pendingChatUnlock,
+      PendingChatUnlockSchema,
+    );
+    if (Result.isErr(result)) return null;
+    const value = NavigationStorage.parsePendingChatUnlock(result.data);
+    if (!value) {
+      await SessionAsyncUtil.remove(StorageKeys.pendingChatUnlock);
+    }
+    return value;
+  }
+
+  static async hasPendingChatUnlock(): Promise<boolean> {
+    return (await NavigationStorage.peekPendingChatUnlock()) !== null;
+  }
+
+  static async clearPendingChatUnlock(): Promise<void> {
+    await SessionAsyncUtil.remove(StorageKeys.pendingChatUnlock);
+  }
+
+  static async savePendingChatImageReturn(input: {
+    messageId: string;
+    returnUrl: string;
+  }): Promise<void> {
+    const payload: PendingChatImageReturn = {
+      reason: "image_paywall",
+      messageId: input.messageId,
+      returnUrl: input.returnUrl,
+      createdAt: Date.now(),
+    };
+    await SessionAsyncUtil.setJson(
+      StorageKeys.pendingChatImageReturn,
+      payload,
+      PendingChatImageReturnSchema,
+    );
+  }
+
+  static async consumePendingChatImageReturn(): Promise<PendingChatImageReturn | null> {
+    const result = await SessionAsyncUtil.getJson(
+      StorageKeys.pendingChatImageReturn,
+      PendingChatImageReturnSchema,
+    );
+    await SessionAsyncUtil.remove(StorageKeys.pendingChatImageReturn);
+    if (Result.isErr(result)) return null;
+    return NavigationStorage.parsePendingChatImageReturn(result.data);
+  }
+
+  private static parsePendingChatUnlock(
+    value: PendingChatUnlock | null,
+  ): PendingChatUnlock | null {
+    if (!value) return null;
+    if (Date.now() - value.createdAt > MAX_AGE_MS) return null;
+    return value;
+  }
+
+  private static parsePendingChatImageReturn(
+    value: PendingChatImageReturn | null,
+  ): PendingChatImageReturn | null {
+    if (!value) return null;
+    if (Date.now() - value.createdAt > MAX_AGE_MS) return null;
+    return value;
+  }
+}

src/lib/navigation/chat_image_return_session.ts

@@ -1,54 +1,19 @@
 "use client";
 
-import { z } from "zod";
+import {
+  NavigationStorage,
+  type PendingChatImageReturn,
+} from "@/data/storage/navigation";
 
-import { StorageKeys } from "@/data/storage/storage_keys";
+export type { PendingChatImageReturn };
-import { Result, SessionAsyncUtil } from "@/utils";
-
-const MAX_AGE_MS = 30 * 60 * 1000;
-
-const PendingChatImageReturnSchema = z.object({
-  reason: z.literal("image_paywall"),
-  messageId: z.string().min(1),
-  returnUrl: z.string().min(1),
-  createdAt: z.number(),
-});
-
-export type PendingChatImageReturn = z.output<
-  typeof PendingChatImageReturnSchema
->;
 
 export async function savePendingChatImageReturn(input: {
   messageId: string;
   returnUrl: string;
 }): Promise<void> {
-  const payload: PendingChatImageReturn = {
+  await NavigationStorage.savePendingChatImageReturn(input);
-    reason: "image_paywall",
-    messageId: input.messageId,
-    returnUrl: input.returnUrl,
-    createdAt: Date.now(),
-  };
-  await SessionAsyncUtil.setJson(
-    StorageKeys.pendingChatImageReturn,
-    payload,
-    PendingChatImageReturnSchema,
-  );
 }
 
 export async function consumePendingChatImageReturn(): Promise<PendingChatImageReturn | null> {
-  const result = await SessionAsyncUtil.getJson(
+  return NavigationStorage.consumePendingChatImageReturn();
-    StorageKeys.pendingChatImageReturn,
-    PendingChatImageReturnSchema,
-  );
-  await SessionAsyncUtil.remove(StorageKeys.pendingChatImageReturn);
-  if (Result.isErr(result)) return null;
-  return parsePendingChatImageReturn(result.data);
-}
-
-function parsePendingChatImageReturn(
-  value: PendingChatImageReturn | null,
-): PendingChatImageReturn | null {
-  if (!value) return null;
-  if (Date.now() - value.createdAt > MAX_AGE_MS) return null;
-  return value;
 }

src/lib/navigation/chat_unlock_session.ts

@@ -1,31 +1,17 @@
 "use client";
 
-import { z } from "zod";
+import {
+  NavigationStorage,
+  type PendingChatUnlock,
+  type PendingChatUnlockKind,
+  type PendingChatUnlockStage,
+} from "@/data/storage/navigation";
 
-import { StorageKeys } from "@/data/storage/storage_keys";
+export type {
-import { Result, SessionAsyncUtil } from "@/utils";
+  PendingChatUnlock,
-
+  PendingChatUnlockKind,
-const MAX_AGE_MS = 30 * 60 * 1000;
+  PendingChatUnlockStage,
-
+};
-export type PendingChatUnlockKind = "private" | "voice" | "image";
-export type PendingChatUnlockStage = "auth" | "payment";
-
-const PendingChatUnlockSchema = z.object({
-  reason: z.literal("single_message_unlock"),
-  messageId: z.string().min(1),
-  kind: z.enum(["private", "voice", "image"]),
-  returnUrl: z
-    .string()
-    .min(1)
-    .refine(
-      (value) => value.startsWith("/") && !value.startsWith("//"),
-      "returnUrl must be an internal route",
-    ),
-  stage: z.enum(["auth", "payment"]),
-  createdAt: z.number(),
-});
-
-export type PendingChatUnlock = z.output<typeof PendingChatUnlockSchema>;
 
 export async function savePendingChatUnlock(input: {
   messageId: string;
@@ -33,56 +19,21 @@ export async function savePendingChatUnlock(input: {
   returnUrl: string;
   stage: PendingChatUnlockStage;
 }): Promise<void> {
-  const payload: PendingChatUnlock = {
+  await NavigationStorage.savePendingChatUnlock(input);
-    reason: "single_message_unlock",
-    messageId: input.messageId,
-    kind: input.kind,
-    returnUrl: input.returnUrl,
-    stage: input.stage,
-    createdAt: Date.now(),
-  };
-  await SessionAsyncUtil.setJson(
-    StorageKeys.pendingChatUnlock,
-    payload,
-    PendingChatUnlockSchema,
-  );
 }
 
 export async function consumePendingChatUnlock(): Promise<PendingChatUnlock | null> {
-  const result = await SessionAsyncUtil.getJson(
+  return NavigationStorage.consumePendingChatUnlock();
-    StorageKeys.pendingChatUnlock,
-    PendingChatUnlockSchema,
-  );
-  await SessionAsyncUtil.remove(StorageKeys.pendingChatUnlock);
-  if (Result.isErr(result)) return null;
-  return parsePendingChatUnlock(result.data);
 }
 
 export async function peekPendingChatUnlock(): Promise<PendingChatUnlock | null> {
-  const result = await SessionAsyncUtil.getJson(
+  return NavigationStorage.peekPendingChatUnlock();
-    StorageKeys.pendingChatUnlock,
-    PendingChatUnlockSchema,
-  );
-  if (Result.isErr(result)) return null;
-  const value = parsePendingChatUnlock(result.data);
-  if (!value) {
-    await SessionAsyncUtil.remove(StorageKeys.pendingChatUnlock);
-  }
-  return value;
 }
 
 export async function hasPendingChatUnlock(): Promise<boolean> {
-  return (await peekPendingChatUnlock()) !== null;
+  return NavigationStorage.hasPendingChatUnlock();
 }
 
 export async function clearPendingChatUnlock(): Promise<void> {
-  await SessionAsyncUtil.remove(StorageKeys.pendingChatUnlock);
+  await NavigationStorage.clearPendingChatUnlock();
-}
-
-function parsePendingChatUnlock(
-  value: PendingChatUnlock | null,
-): PendingChatUnlock | null {
-  if (!value) return null;
-  if (Date.now() - value.createdAt > MAX_AGE_MS) return null;
-  return value;
 }

src/providers/root-providers.tsx

@@ -17,6 +17,7 @@
 import type { ReactNode } from "react";
 
 import { ViewportCssVarsProvider } from "@/providers/viewport-css-vars-provider";
+import { AppNavigationGuard } from "@/router/app-navigation-guard";
 import { AuthProvider } from "@/stores/auth/auth-context";
 import { AuthStatusChecker } from "@/stores/auth/auth-status-checker";
 import { OAuthSessionSync } from "@/stores/auth/oauth-session-sync";
@@ -42,6 +43,7 @@ export function RootProviders({ children }: RootProvidersProps) {
         <AuthStatusChecker />
         {/* OAuthSessionSync 同样依赖 AuthProvider 上下文 */}
         <OAuthSessionSync />
+        <AppNavigationGuard />
         <UserProvider>
           <UserAuthSync />
           <PaymentProvider>

src/router/__tests__/navigation-resolver.test.ts

@@ -0,0 +1,74 @@
+import { describe, expect, it } from "vitest";
+
+import {
+  isAuthenticatedUser,
+  resolveAuthenticatedNavigation,
+  resolveRouteGuardRedirect,
+} from "../navigation-resolver";
+import { ROUTE_BUILDERS, ROUTES } from "../routes";
+
+describe("navigation resolver", () => {
+  it("treats only real login providers as authenticated users", () => {
+    expect(isAuthenticatedUser("notLoggedIn")).toBe(false);
+    expect(isAuthenticatedUser("guest")).toBe(false);
+    expect(isAuthenticatedUser("email")).toBe(true);
+    expect(isAuthenticatedUser("facebook")).toBe(true);
+  });
+
+  it("wraps protected navigation with auth redirect for guests", () => {
+    expect(
+      resolveAuthenticatedNavigation({
+        loginStatus: "guest",
+        targetUrl: "/subscription?type=vip",
+      }),
+    ).toBe(ROUTE_BUILDERS.authWithRedirect("/subscription?type=vip"));
+  });
+
+  it("keeps protected navigation targets for authenticated users", () => {
+    expect(
+      resolveAuthenticatedNavigation({
+        loginStatus: "google",
+        targetUrl: "/subscription?type=topup",
+      }),
+    ).toBe("/subscription?type=topup");
+  });
+
+  it("redirects not logged in session routes to splash", () => {
+    expect(
+      resolveRouteGuardRedirect({
+        loginStatus: "notLoggedIn",
+        pathname: ROUTES.chat,
+      }),
+    ).toBe(ROUTES.splash);
+  });
+
+  it("redirects non-real users on subscription routes to auth", () => {
+    expect(
+      resolveRouteGuardRedirect({
+        loginStatus: "guest",
+        pathname: ROUTES.subscription,
+        searchParams: "type=vip&returnTo=chat",
+      }),
+    ).toBe(
+      ROUTE_BUILDERS.authWithRedirect(
+        "/subscription?type=vip&returnTo=chat",
+      ),
+    );
+  });
+
+  it("allows public and authorized routes", () => {
+    expect(
+      resolveRouteGuardRedirect({
+        loginStatus: "guest",
+        pathname: ROUTES.coinsRules,
+      }),
+    ).toBeNull();
+    expect(
+      resolveRouteGuardRedirect({
+        loginStatus: "email",
+        pathname: ROUTES.subscription,
+        searchParams: "type=vip",
+      }),
+    ).toBeNull();
+  });
+});

src/router/__tests__/route-meta.test.ts

@@ -0,0 +1,32 @@
+import { describe, expect, it } from "vitest";
+
+import { getRouteAccess, isInternalRoute } from "../route-meta";
+import { ROUTES } from "../routes";
+
+describe("route meta", () => {
+  it("classifies static routes by access level", () => {
+    expect(getRouteAccess(ROUTES.splash)).toBe("authOnly");
+    expect(getRouteAccess(ROUTES.auth)).toBe("authOnly");
+    expect(getRouteAccess(ROUTES.chat)).toBe("session");
+    expect(getRouteAccess(ROUTES.sidebar)).toBe("session");
+    expect(getRouteAccess(ROUTES.subscription)).toBe("realUser");
+    expect(getRouteAccess(ROUTES.coinsRules)).toBe("public");
+  });
+
+  it("classifies known dynamic chat routes", () => {
+    expect(getRouteAccess("/chat/image/msg_1")).toBe("session");
+    expect(getRouteAccess("/chat/deviceid/device_1")).toBe("public");
+  });
+
+  it("treats unknown routes as public by default", () => {
+    expect(getRouteAccess("/unknown")).toBe("public");
+  });
+
+  it("accepts only internal redirect targets", () => {
+    expect(isInternalRoute("/chat")).toBe(true);
+    expect(isInternalRoute("/subscription?type=vip")).toBe(true);
+    expect(isInternalRoute("https://example.com/chat")).toBe(false);
+    expect(isInternalRoute("//example.com/chat")).toBe(false);
+    expect(isInternalRoute(null)).toBe(false);
+  });
+});

src/router/app-navigation-guard.tsx

@@ -0,0 +1,33 @@
+"use client";
+
+import { useEffect } from "react";
+import { usePathname, useRouter } from "next/navigation";
+
+import { useAuthState } from "@/stores/auth/auth-context";
+
+import { resolveRouteGuardRedirect } from "./navigation-resolver";
+
+export function AppNavigationGuard() {
+  const authState = useAuthState();
+  const pathname = usePathname();
+  const router = useRouter();
+
+  useEffect(() => {
+    if (!authState.hasInitialized || authState.isLoading) return;
+
+    const redirectTo = resolveRouteGuardRedirect({
+      loginStatus: authState.loginStatus,
+      pathname,
+      searchParams: window.location.search.replace(/^\?/, ""),
+    });
+    if (redirectTo) router.replace(redirectTo);
+  }, [
+    authState.hasInitialized,
+    authState.isLoading,
+    authState.loginStatus,
+    pathname,
+    router,
+  ]);
+
+  return null;
+}

src/router/navigation-resolver.ts

@@ -0,0 +1,41 @@
+import type { LoginStatus } from "@/data/dto/auth";
+
+import { getRouteAccess } from "./route-meta";
+import { ROUTE_BUILDERS, ROUTES } from "./routes";
+
+export function isAuthenticatedUser(loginStatus: LoginStatus): boolean {
+  return loginStatus !== "notLoggedIn" && loginStatus !== "guest";
+}
+
+export function resolveAuthenticatedNavigation(input: {
+  loginStatus: LoginStatus;
+  targetUrl: string;
+}): string {
+  if (isAuthenticatedUser(input.loginStatus)) return input.targetUrl;
+  return ROUTE_BUILDERS.authWithRedirect(input.targetUrl);
+}
+
+export function resolveRouteGuardRedirect(input: {
+  loginStatus: LoginStatus;
+  pathname: string;
+  searchParams?: string;
+}): string | null {
+  const access = getRouteAccess(input.pathname);
+
+  if (access === "session" && input.loginStatus === "notLoggedIn") {
+    return ROUTES.splash;
+  }
+
+  if (access === "realUser" && !isAuthenticatedUser(input.loginStatus)) {
+    return ROUTE_BUILDERS.authWithRedirect(
+      buildCurrentUrl(input.pathname, input.searchParams),
+    );
+  }
+
+  return null;
+}
+
+function buildCurrentUrl(pathname: string, searchParams?: string): string {
+  if (!searchParams) return pathname;
+  return `${pathname}?${searchParams}`;
+}

src/router/navigation-types.ts

@@ -0,0 +1,31 @@
+import type { PayChannel } from "@/data/dto/payment";
+import type {
+  PendingChatUnlockKind,
+  PendingChatUnlockStage,
+} from "@/data/storage/navigation";
+
+export type AppSubscriptionType = "vip" | "topup";
+export type AppSubscriptionReturnTo = "chat" | null;
+
+export interface OpenSubscriptionInput {
+  type: AppSubscriptionType;
+  payChannel?: PayChannel;
+  returnTo?: AppSubscriptionReturnTo;
+  replace?: boolean;
+}
+
+export interface StartMessageUnlockInput {
+  messageId: string;
+  kind: PendingChatUnlockKind;
+  returnUrl: string;
+  stage?: PendingChatUnlockStage;
+  onAuthenticated: () => void;
+}
+
+export interface OpenSubscriptionForPendingUnlockInput {
+  messageId: string;
+  kind: PendingChatUnlockKind;
+  returnUrl: string;
+  type: AppSubscriptionType;
+  payChannel?: PayChannel;
+}

src/router/route-meta.ts

@@ -0,0 +1,23 @@
+import { ROUTES } from "./routes";
+
+export type RouteAccess = "public" | "session" | "realUser" | "authOnly";
+
+const STATIC_ROUTE_ACCESS: Partial<Record<string, RouteAccess>> = {
+  [ROUTES.root]: "public",
+  [ROUTES.splash]: "authOnly",
+  [ROUTES.auth]: "authOnly",
+  [ROUTES.chat]: "session",
+  [ROUTES.sidebar]: "session",
+  [ROUTES.subscription]: "realUser",
+  [ROUTES.coinsRules]: "public",
+};
+
+export function getRouteAccess(pathname: string): RouteAccess {
+  if (pathname.startsWith("/chat/image/")) return "session";
+  if (pathname.startsWith("/chat/deviceid/")) return "public";
+  return STATIC_ROUTE_ACCESS[pathname] ?? "public";
+}
+
+export function isInternalRoute(value: string | null | undefined): boolean {
+  return Boolean(value && value.startsWith("/") && !value.startsWith("//"));
+}

src/router/routes.ts

@@ -48,26 +48,6 @@ export const ROUTE_BUILDERS = {
     `${ROUTES.auth}?redirect=${encodeURIComponent(redirectTo)}` as const,
 } as const;
 
-/** 仅未登录态可见的路由（命中后已登录用户应跳走） */
-export const AUTH_ONLY_ROUTES: readonly StaticRoute[] = [
-  ROUTES.splash,
-  ROUTES.auth,
-] as const;
-
-/** 仅登录态可见的路由（命中后未登录用户应跳走） */
-export const PROTECTED_ROUTES: readonly StaticRoute[] = [
-  ROUTES.chat,
-  ROUTES.sidebar,
-  ROUTES.subscription,
-] as const;
-
-/** 公开路由（游客态也允许访问） */
-export const PUBLIC_ROUTES: readonly StaticRoute[] = [
-  ROUTES.chat,
-  ROUTES.sidebar,
-  ROUTES.coinsRules,
-] as const;
-
 /** 所有静态路由，供 `proxy.ts` matcher 与未来 sitemap 使用 */
 export const ALL_STATIC_ROUTES: readonly StaticRoute[] = [
   ROUTES.splash,

src/router/use-app-navigator.ts

@@ -0,0 +1,140 @@
+"use client";
+
+import { useRouter } from "next/navigation";
+
+import { NavigationStorage } from "@/data/storage/navigation";
+import { getDefaultPayChannelForCountryCode } from "@/lib/payment/default_pay_channel";
+import { useAuthState } from "@/stores/auth/auth-context";
+import { useUserState } from "@/stores/user/user-context";
+
+import {
+  ROUTE_BUILDERS,
+  ROUTES,
+  type Route,
+} from "./routes";
+import {
+  isAuthenticatedUser as resolveIsAuthenticatedUser,
+  resolveAuthenticatedNavigation,
+} from "./navigation-resolver";
+import type {
+  OpenSubscriptionForPendingUnlockInput,
+  OpenSubscriptionInput,
+  StartMessageUnlockInput,
+} from "./navigation-types";
+
+export interface AppNavigator {
+  push: (href: string, options?: { scroll?: boolean }) => void;
+  replace: (href: string, options?: { scroll?: boolean }) => void;
+  openAuth: (redirectTo?: string) => void;
+  openSubscription: (input: OpenSubscriptionInput) => void;
+  startMessageUnlock: (input: StartMessageUnlockInput) => void;
+  openSubscriptionForPendingUnlock: (
+    input: OpenSubscriptionForPendingUnlockInput,
+  ) => void;
+  getDefaultPayChannel: () => ReturnType<typeof getDefaultPayChannelForCountryCode>;
+  isAuthenticatedUser: boolean;
+}
+
+export function useAppNavigator(): AppNavigator {
+  const router = useRouter();
+  const authState = useAuthState();
+  const userState = useUserState();
+  const isAuthenticatedUser = resolveIsAuthenticatedUser(authState.loginStatus);
+
+  function push(href: string, options?: { scroll?: boolean }): void {
+    router.push(href, options);
+  }
+
+  function replace(href: string, options?: { scroll?: boolean }): void {
+    router.replace(href, options);
+  }
+
+  function openAuth(redirectTo: string = ROUTES.chat): void {
+    router.push(ROUTE_BUILDERS.authWithRedirect(redirectTo));
+  }
+
+  function getDefaultPayChannel() {
+    return getDefaultPayChannelForCountryCode(userState.currentUser?.countryCode);
+  }
+
+  function openSubscription({
+    type,
+    payChannel = getDefaultPayChannel(),
+    returnTo = null,
+    replace: shouldReplace = false,
+  }: OpenSubscriptionInput): void {
+    const target = ROUTE_BUILDERS.subscription(type, {
+      payChannel,
+      returnTo: returnTo ?? undefined,
+    });
+
+    const nextUrl = resolveAuthenticatedNavigation({
+      loginStatus: authState.loginStatus,
+      targetUrl: target,
+    });
+
+    if (shouldReplace) {
+      router.replace(nextUrl);
+      return;
+    }
+    router.push(nextUrl);
+  }
+
+  function startMessageUnlock({
+    messageId,
+    kind,
+    returnUrl,
+    stage = "auth",
+    onAuthenticated,
+  }: StartMessageUnlockInput): void {
+    if (isAuthenticatedUser) {
+      onAuthenticated();
+      return;
+    }
+
+    void (async () => {
+      await NavigationStorage.savePendingChatUnlock({
+        messageId,
+        kind,
+        returnUrl,
+        stage,
+      });
+      router.push(ROUTE_BUILDERS.authWithRedirect(returnUrl));
+    })();
+  }
+
+  function openSubscriptionForPendingUnlock({
+    messageId,
+    kind,
+    returnUrl,
+    type,
+    payChannel = getDefaultPayChannel(),
+  }: OpenSubscriptionForPendingUnlockInput): void {
+    void (async () => {
+      await NavigationStorage.savePendingChatUnlock({
+        messageId,
+        kind,
+        returnUrl,
+        stage: "payment",
+      });
+      openSubscription({
+        type,
+        payChannel,
+        returnTo: "chat",
+      });
+    })();
+  }
+
+  return {
+    push,
+    replace,
+    openAuth,
+    openSubscription,
+    startMessageUnlock,
+    openSubscriptionForPendingUnlock,
+    getDefaultPayChannel,
+    isAuthenticatedUser,
+  };
+}
+
+export type { Route };

src/stores/sync/chat-auth-sync.tsx

@@ -8,22 +8,14 @@
  * 不再承担全局状态同步职责。
  */
 import { useEffect, useRef } from "react";
-import { usePathname, useRouter } from "next/navigation";
 
 import { AuthStorage } from "@/data/storage/auth";
 import { useAuthState } from "@/stores/auth/auth-context";
 import { useChatDispatch } from "@/stores/chat/chat-context";
-import { PROTECTED_ROUTES, ROUTES, type StaticRoute } from "@/router/routes";
-
-function isProtectedPath(pathname: string): boolean {
-  return PROTECTED_ROUTES.some((route: StaticRoute) => pathname === route);
-}
 
 export function ChatAuthSync() {
   const authState = useAuthState();
   const chatDispatch = useChatDispatch();
-  const pathname = usePathname();
-  const router = useRouter();
   const prevSessionKeyRef = useRef<string | null>(null);
 
   useEffect(() => {
@@ -35,9 +27,6 @@ export function ChatAuthSync() {
 
     if (authState.loginStatus === "notLoggedIn") {
       chatDispatch({ type: "ChatLogout" });
-      if (isProtectedPath(pathname)) {
-        router.replace(ROUTES.splash);
-      }
       return;
     }
 
@@ -65,8 +54,6 @@ export function ChatAuthSync() {
     authState.isLoading,
     authState.loginStatus,
     chatDispatch,
-    pathname,
-    router,
   ]);
 
   return null;