refactor(router): centralize app route transitions

src/app/auth/auth-screen.tsx

@@ -5,11 +5,11 @@
  * 
  */
 import { useEffect, useSyncExternalStore } from "react";
-import { useRouter } from "next/navigation";
 
 import { MobileShell } from "@/app/_components/core";
 import { useAuthDispatch, useAuthState } from "@/stores/auth/auth-context";
 import { ROUTES } from "@/router/routes";
+import { useAppNavigator } from "@/router/use-app-navigator";
 
 import { AuthBackground, AuthPanel } from "./components";
 import styles from "./components/auth-screen.module.css";
@@ -20,7 +20,7 @@ const log = new Logger("AppAuthAuthScreen");
 export function AuthScreen() {
   const state = useAuthState();
   const authDispatch = useAuthDispatch();
-  const router = useRouter();
+  const navigator = useAppNavigator();
   const redirectTo = useSyncExternalStore(
     subscribeLocationSnapshot,
     readRedirectFromLocation,
@@ -40,17 +40,17 @@ export function AuthScreen() {
     });
 
     if (state.pendingRedirect && state.loginStatus !== "notLoggedIn") {
-      log.debug("[auth-screen] useEffect → router.replace [via pendingRedirect flag]", {
+      log.debug("[auth-screen] useEffect → navigator.replace [via pendingRedirect flag]", {
         redirectTo: safeRedirectTo,
       });
       authDispatch({ type: "AuthClearPendingRedirect" });
-      router.replace(safeRedirectTo);
+      navigator.replace(safeRedirectTo);
     }
   }, [
     state.loginStatus,
     state.pendingRedirect,
     authDispatch,
-    router,
+    navigator,
     safeRedirectTo,
   ]);
 

src/app/auth/components/auth-panel.tsx

@@ -2,9 +2,8 @@
 /**
  * 认证面板：顶层 switch（Facebook / Email）+ 悬浮返回按钮
  */
-import { useRouter } from "next/navigation";
-
 import { BackButton } from "@/app/_components";
+import { useAppNavigator } from "@/router/use-app-navigator";
 import { useAuthDispatch, useAuthState } from "@/stores/auth/auth-context";
 
 import { AuthEmailPanel } from "./auth-email-panel";
@@ -14,7 +13,7 @@ import styles from "./auth-panel.module.css";
 export function AuthPanel() {
   const state = useAuthState();
   const dispatch = useAuthDispatch();
-  const router = useRouter();
+  const navigator = useAppNavigator();
 
   const switchToFacebook = () =>
     dispatch({ type: "AuthPanelModeChanged", mode: "facebook" });
@@ -25,7 +24,7 @@ export function AuthPanel() {
     if (state.authPanelMode === "email") {
       switchToFacebook();
     } else {
-      router.back();
+      navigator.back();
     }
   };
 

src/app/chat/components/image-bubble.tsx

@@ -9,10 +9,9 @@
  *   - 错误占位符（broken image icon）
  */
 import Image from "next/image";
-import { useRouter } from "next/navigation";
 import { useState } from "react";
 
-import { ROUTE_BUILDERS } from "@/router/routes";
+import { useAppNavigator } from "@/router/use-app-navigator";
 import {
   isBrowserLocalChatImageSource,
   normalizeChatImageSource,
@@ -33,7 +32,7 @@ export function ImageBubble({
   imageUrl,
   imagePaywalled = false,
 }: ImageBubbleProps) {
-  const router = useRouter();
+  const navigator = useAppNavigator();
   const [errorSrc, setErrorSrc] = useState<string | null>(null);
   const { mediaUrl, isUsingCachedMedia, reportMediaError } =
     useCachedChatMediaUrl({
@@ -58,7 +57,7 @@ export function ImageBubble({
   const openImage = () => {
     if (!messageId) return;
     requestChatScrollSnapshotSave(messageId);
-    router.push(ROUTE_BUILDERS.chatImage(messageId), { scroll: false });
+    navigator.openChatImage(messageId);
   };
 
   return (

src/app/chat/deviceid/[deviceId]/DeepLinkPersist.tsx

@@ -6,14 +6,13 @@
  * 设计：
  *   - 不走 Server `redirect()`：避免把 fbid 暴露在 URL 里。
  *   - deviceId / fbid / avatarUrl 统一交给 `lib/chat` 落地。
- *   - 写入完成后 `router.replace('/chat')`，URL 不留深链痕迹。
+ *   - 写入完成后通过统一导航回到 `/chat`，URL 不留深链痕迹。
  */
 
 import { useEffect, useState } from "react";
-import { useRouter } from "next/navigation";
 
 import { persistExternalBrowserChatDeepLink } from "@/lib/chat/chat_external_browser";
-import { ROUTES } from "@/router/routes";
+import { useAppNavigator } from "@/router/use-app-navigator";
 import { Logger } from "@/utils";
 
 const log = new Logger("AppChatDeviceidDeviceIdDeepLinkPersist");
@@ -29,7 +28,7 @@ export default function DeepLinkPersist({
   fbid,
   avatarUrl,
 }: DeepLinkPersistProps) {
-  const router = useRouter();
+  const navigator = useAppNavigator();
   const [done, setDone] = useState(false);
 
   useEffect(() => {
@@ -45,10 +44,10 @@ export default function DeepLinkPersist({
         log.warn("[DeepLinkPersist] failed to persist", err);
       } finally {
         setDone(true);
-        router.replace(ROUTES.chat);
+        navigator.openChat({ replace: true });
       }
     })();
-  }, [avatarUrl, deviceId, fbid, router]);
+  }, [avatarUrl, deviceId, fbid, navigator]);
 
   return (
     <div

src/app/chat/deviceid/[deviceId]/page.tsx

@@ -3,7 +3,7 @@
  *
  * 对齐 Flutter `lib/router/app_router.dart:60-78` 的 `GoRoute(path: '/chat/deviceid/:deviceId')`：
  * 把 `deviceId` 路径参数与 `fbid` / `avatarUrl` 查询参数透传给 Client 组件
- * `<DeepLinkPersist>`，由它把数据写入 localStorage 后 `router.replace('/chat')`。
+ * `<DeepLinkPersist>`，由它把数据写入 localStorage 后通过统一导航回到 `/chat`。
  *
  * Next.js 15+ 约定：`params` / `searchParams` 是 Promise，必须 await。
  * Next.js 16 全局 helper `PageProps<'/literal'>` 由 `next dev` / `next build` /

src/app/chat/image/[messageId]/chat-image-viewer-screen.tsx

@@ -1,9 +1,8 @@
 "use client";
 
-import { useRouter } from "next/navigation";
-
 import { MobileShell } from "@/app/_components/core";
-import { ROUTE_BUILDERS, ROUTES } from "@/router/routes";
+import { ROUTE_BUILDERS } from "@/router/routes";
+import { useAppNavigator } from "@/router/use-app-navigator";
 import { useChatDispatch, useChatState } from "@/stores/chat/chat-context";
 
 import {
@@ -21,7 +20,7 @@ export interface ChatImageViewerScreenProps {
 export function ChatImageViewerScreen({
   messageId,
 }: ChatImageViewerScreenProps) {
-  const router = useRouter();
+  const navigator = useAppNavigator();
   const chatState = useChatState();
   const chatDispatch = useChatDispatch();
   const returnUrl = ROUTE_BUILDERS.chatImage(messageId);
@@ -40,7 +39,7 @@ export function ChatImageViewerScreen({
   );
 
   const handleClose = () => {
-    router.push(ROUTES.chat, { scroll: false });
+    navigator.openChat({ scroll: false });
   };
 
   const handleUnlockImagePaywall = () => {

src/app/splash/splash-screen.tsx

@@ -1,12 +1,11 @@
 "use client";
 
 import { useEffect } from "react";
-import { useRouter } from "next/navigation";
 
 import { MobileShell } from "@/app/_components/core";
 import { hasBusinessLoginToken } from "@/lib/auth/auth_session";
+import { useAppNavigator } from "@/router/use-app-navigator";
 import { useAuthDispatch, useAuthState } from "@/stores/auth/auth-context";
-import { ROUTES } from "@/router/routes";
 import { pwaUtil, Logger } from "@/utils";
 
 import {
@@ -25,13 +24,13 @@ if (typeof window !== "undefined") {
 }
 
 export function SplashScreen() {
-  const router = useRouter();
+  const navigator = useAppNavigator();
   const state = useAuthState();
   const authDispatch = useAuthDispatch();
 
   const handleSkip = () => {
     authDispatch({ type: "AuthGuestLoginSubmitted" });
-    router.replace(ROUTES.chat);
+    navigator.openChat({ replace: true });
   };
 
   useEffect(() => {
@@ -49,13 +48,13 @@ export function SplashScreen() {
     let cancelled = false;
     void (async () => {
       if (!cancelled && (await hasBusinessLoginToken())) {
-        router.replace(ROUTES.chat);
+        navigator.openChat({ replace: true });
       }
     })();
     return () => {
       cancelled = true;
     };
-  }, [router]);
+  }, [navigator]);
 
   // ─────────────────────────────────────────────────────────────
   // useEffect ② 按钮刚派了事件（pendingRedirect=true） +
@@ -76,12 +75,12 @@ export function SplashScreen() {
 
     if (state.pendingRedirect && state.loginStatus !== "notLoggedIn") {
       log.debug(
-        "[splash] useEffect ② → router.replace(/chat) [via pendingRedirect flag]",
+        "[splash] useEffect ② → navigator.openChat [via pendingRedirect flag]",
       );
       authDispatch({ type: "AuthClearPendingRedirect" });
-      router.replace(ROUTES.chat);
+      navigator.openChat({ replace: true });
     }
-  }, [state.loginStatus, state.pendingRedirect, authDispatch, router]);
+  }, [state.loginStatus, state.pendingRedirect, authDispatch, navigator]);
 
   return (
     <MobileShell background="var(--color-sidebar-background)">

src/app/subscription/return/page.tsx

@@ -1,7 +1,6 @@
 "use client";
 
 import { useEffect, useState } from "react";
-import { useRouter } from "next/navigation";
 
 import { MobileShell } from "@/app/_components/core";
 import {
@@ -9,11 +8,12 @@ import {
   getPendingPaymentOrder,
 } from "@/lib/payment/pending_payment_order";
 import { ROUTES } from "@/router/routes";
+import { useAppNavigator } from "@/router/use-app-navigator";
 
 type ReturnStatus = "loading" | "missing";
 
 export default function SubscriptionReturnPage() {
-  const router = useRouter();
+  const navigator = useAppNavigator();
   const [status, setStatus] = useState<ReturnStatus>("loading");
 
   useEffect(() => {
@@ -24,7 +24,7 @@ export default function SubscriptionReturnPage() {
       if (cancelled) return;
 
       if (result.success && result.data !== null) {
-        router.replace(buildPendingPaymentSubscriptionUrl(result.data));
+        navigator.replace(buildPendingPaymentSubscriptionUrl(result.data));
         return;
       }
 
@@ -35,7 +35,7 @@ export default function SubscriptionReturnPage() {
     return () => {
       cancelled = true;
     };
-  }, [router]);
+  }, [navigator]);
 
   return (
     <MobileShell>
@@ -62,7 +62,7 @@ export default function SubscriptionReturnPage() {
         {status === "missing" ? (
           <button
             type="button"
-            onClick={() => router.replace(ROUTES.subscription)}
+            onClick={() => navigator.replace(ROUTES.subscription)}
             style={{
               marginTop: "0.5rem",
               padding: "0.75rem 1.5rem",

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

@@ -1,16 +1,12 @@
 "use client";
 
 import { useEffect, useRef, useState } from "react";
-import { useRouter } from "next/navigation";
 
-import {
-  consumeSubscriptionExitUrl,
-  peekSubscriptionExplicitExitUrl,
-} from "@/lib/navigation/subscription_exit";
 import {
   clearPendingPaymentOrder,
   getPendingPaymentOrderForType,
 } from "@/lib/payment/pending_payment_order";
+import { useAppNavigator } from "@/router/use-app-navigator";
 import {
   usePaymentDispatch,
   usePaymentState,
@@ -33,7 +29,7 @@ export function useSubscriptionPaymentFlow({
   returnTo,
   initialPayChannel,
 }: UseSubscriptionPaymentFlowInput) {
-  const router = useRouter();
+  const navigator = useAppNavigator();
   const userDispatch = useUserDispatch();
   const payment = usePaymentState();
   const paymentDispatch = usePaymentDispatch();
@@ -148,22 +144,13 @@ export function useSubscriptionPaymentFlow({
   }, [payment.currentOrderId, payment.isPaid, payment.status]);
 
   const handleBackClick = () => {
-    void (async () => {
+    navigator.exitSubscription(returnTo);
-      router.replace(await consumeSubscriptionExitUrl(returnTo));
-    })();
   };
 
   const handlePaymentSuccessClose = () => {
-    void (async () => {
     setShowPaymentSuccessDialog(false);
     paymentDispatch({ type: "PaymentReset" });
-      const pendingExitUrl = await peekSubscriptionExplicitExitUrl();
+    navigator.exitSubscriptionAfterSuccess(returnTo);
-      if (pendingExitUrl) {
-        router.replace(pendingExitUrl);
-        return;
-      }
-      router.replace(await consumeSubscriptionExitUrl(returnTo));
-    })();
   };
 
   return {

src/router/use-app-navigator.ts

@@ -1,8 +1,14 @@
 "use client";
 
+import { useCallback, useMemo } from "react";
 import { useRouter } from "next/navigation";
 
 import { NavigationStorage } from "@/data/storage/navigation";
+import type { SubscriptionReturnTo } from "@/lib/navigation/subscription_exit";
+import {
+  consumeSubscriptionExitUrl,
+  peekSubscriptionExplicitExitUrl,
+} from "@/lib/navigation/subscription_exit";
 import { getDefaultPayChannelForCountryCode } from "@/lib/payment/default_pay_channel";
 import { useAuthState } from "@/stores/auth/auth-context";
 import { useUserState } from "@/stores/user/user-context";
@@ -25,8 +31,13 @@ import type {
 export interface AppNavigator {
   push: (href: string, options?: { scroll?: boolean }) => void;
   replace: (href: string, options?: { scroll?: boolean }) => void;
+  back: () => void;
   openAuth: (redirectTo?: string) => void;
+  openChat: (options?: { replace?: boolean; scroll?: boolean }) => void;
+  openChatImage: (messageId: string) => void;
   openSubscription: (input: OpenSubscriptionInput) => void;
+  exitSubscription: (returnTo: SubscriptionReturnTo) => void;
+  exitSubscriptionAfterSuccess: (returnTo: SubscriptionReturnTo) => void;
   startMessageUnlock: (input: StartMessageUnlockInput) => void;
   openSubscriptionForPendingUnlock: (
     input: OpenSubscriptionForPendingUnlockInput,
@@ -41,28 +52,46 @@ export function useAppNavigator(): AppNavigator {
   const userState = useUserState();
   const isAuthenticatedUser = resolveIsAuthenticatedUser(authState.loginStatus);
 
-  function push(href: string, options?: { scroll?: boolean }): void {
+  const push = useCallback((href: string, options?: { scroll?: boolean }): void => {
     router.push(href, options);
-  }
+  }, [router]);
 
-  function replace(href: string, options?: { scroll?: boolean }): void {
+  const replace = useCallback((href: string, options?: { scroll?: boolean }): void => {
     router.replace(href, options);
-  }
+  }, [router]);
 
-  function openAuth(redirectTo: string = ROUTES.chat): void {
+  const back = useCallback((): void => {
+    router.back();
+  }, [router]);
+
+  const openAuth = useCallback((redirectTo: string = ROUTES.chat): void => {
     router.push(ROUTE_BUILDERS.authWithRedirect(redirectTo));
-  }
+  }, [router]);
 
-  function getDefaultPayChannel() {
+  const openChat = useCallback((options: { replace?: boolean; scroll?: boolean } = {}): void => {
+    const navOptions = { scroll: options.scroll ?? false };
+    if (options.replace) {
+      router.replace(ROUTES.chat, navOptions);
+      return;
+    }
+    router.push(ROUTES.chat, navOptions);
+  }, [router]);
+
+  const openChatImage = useCallback((messageId: string): void => {
+    router.push(ROUTE_BUILDERS.chatImage(messageId), { scroll: false });
+  }, [router]);
+
+  const getDefaultPayChannel = useCallback(() => {
     return getDefaultPayChannelForCountryCode(userState.currentUser?.countryCode);
-  }
+  }, [userState.currentUser?.countryCode]);
 
-  function openSubscription({
+  const openSubscription = useCallback(
+    ({
       type,
       payChannel = getDefaultPayChannel(),
       returnTo = null,
       replace: shouldReplace = false,
-  }: OpenSubscriptionInput): void {
+    }: OpenSubscriptionInput): void => {
       const target = ROUTE_BUILDERS.subscription(type, {
         payChannel,
         returnTo: returnTo ?? undefined,
@@ -78,15 +107,18 @@ export function useAppNavigator(): AppNavigator {
         return;
       }
       router.push(nextUrl);
-  }
+    },
+    [authState.loginStatus, getDefaultPayChannel, router],
+  );
 
-  function startMessageUnlock({
+  const startMessageUnlock = useCallback(
+    ({
       messageId,
       kind,
       returnUrl,
       stage = "auth",
       onAuthenticated,
-  }: StartMessageUnlockInput): void {
+    }: StartMessageUnlockInput): void => {
       if (isAuthenticatedUser) {
         onAuthenticated();
         return;
@@ -101,15 +133,18 @@ export function useAppNavigator(): AppNavigator {
         });
         router.push(ROUTE_BUILDERS.authWithRedirect(returnUrl));
       })();
-  }
+    },
+    [isAuthenticatedUser, router],
+  );
 
-  function openSubscriptionForPendingUnlock({
+  const openSubscriptionForPendingUnlock = useCallback(
+    ({
       messageId,
       kind,
       returnUrl,
       type,
       payChannel = getDefaultPayChannel(),
-  }: OpenSubscriptionForPendingUnlockInput): void {
+    }: OpenSubscriptionForPendingUnlockInput): void => {
       void (async () => {
         await NavigationStorage.savePendingChatUnlock({
           messageId,
@@ -123,18 +158,56 @@ export function useAppNavigator(): AppNavigator {
           returnTo: "chat",
         });
       })();
-  }
+    },
+    [getDefaultPayChannel, openSubscription],
+  );
 
-  return {
+  const exitSubscription = useCallback((returnTo: SubscriptionReturnTo): void => {
+    void (async () => {
+      router.replace(await consumeSubscriptionExitUrl(returnTo));
+    })();
+  }, [router]);
+
+  const exitSubscriptionAfterSuccess = useCallback((returnTo: SubscriptionReturnTo): void => {
+    void (async () => {
+      const pendingExitUrl = await peekSubscriptionExplicitExitUrl();
+      if (pendingExitUrl) {
+        router.replace(pendingExitUrl);
+        return;
+      }
+      router.replace(await consumeSubscriptionExitUrl(returnTo));
+    })();
+  }, [router]);
+
+  return useMemo(() => ({
     push,
     replace,
+    back,
     openAuth,
+    openChat,
+    openChatImage,
     openSubscription,
+    exitSubscription,
+    exitSubscriptionAfterSuccess,
     startMessageUnlock,
     openSubscriptionForPendingUnlock,
     getDefaultPayChannel,
     isAuthenticatedUser,
-  };
+  }), [
+    back,
+    exitSubscription,
+    exitSubscriptionAfterSuccess,
+    getDefaultPayChannel,
+    isAuthenticatedUser,
+    openAuth,
+    openChat,
+    openChatImage,
+    openSubscription,
+    openSubscriptionForPendingUnlock,
+    push,
+    replace,
+    startMessageUnlock,
+  ]);
 }
 
 export type { Route };