refactor(auth): simplify splash guest entry

src/app/auth/auth-screen.tsx

@@ -7,7 +7,8 @@
 import { useEffect, useSyncExternalStore } from "react";
 
 import { MobileShell } from "@/app/_components/core";
-import { useAuthDispatch, useAuthState } from "@/stores/auth/auth-context";
+import { useAuthState } from "@/stores/auth/auth-context";
+import { isAuthenticatedUser } from "@/router/navigation-resolver";
 import { ROUTES } from "@/router/routes";
 import { useAppNavigator } from "@/router/use-app-navigator";
 
@@ -19,7 +20,6 @@ const log = new Logger("AppAuthAuthScreen");
 
 export function AuthScreen() {
   const state = useAuthState();
-  const authDispatch = useAuthDispatch();
   const navigator = useAppNavigator();
   const redirectTo = useSyncExternalStore(
     subscribeLocationSnapshot,
@@ -28,28 +28,23 @@ export function AuthScreen() {
   );
   const safeRedirectTo = getSafeRedirectPath(redirectTo) ?? ROUTES.chat;
 
-  // 邮箱登录成功 → 跳转；User hydrate 由根级 <UserAuthSync /> 监听 loginStatus 变化处理。
-  // 用 pendingRedirect flag（不是 useRef transition detection）——
-  // re-mount 时 flag 在 auth context 里持久，区分"刚按了"和"re-visit"准确无误。
+  // 真实用户登录成功 → 跳转；User hydrate 由根级 <UserAuthSync /> 监听 loginStatus 变化处理。
+  // 游客态不触发跳转，避免自动游客登录打断 auth 页面。
   useEffect(() => {
-    log.debug("[auth-screen] useEffect (loginStatus + pendingRedirect)", {
-      pending: state.pendingRedirect,
+    const shouldRedirect = isAuthenticatedUser(state.loginStatus);
+    log.debug("[auth-screen] useEffect (loginStatus)", {
       loginStatus: state.loginStatus,
-      willRedirect:
-        state.pendingRedirect && state.loginStatus !== "notLoggedIn",
+      willRedirect: shouldRedirect,
     });
 
-    if (state.pendingRedirect && state.loginStatus !== "notLoggedIn") {
-      log.debug("[auth-screen] useEffect → navigator.replace [via pendingRedirect flag]", {
+    if (shouldRedirect) {
+      log.debug("[auth-screen] useEffect → navigator.replace", {
         redirectTo: safeRedirectTo,
       });
-      authDispatch({ type: "AuthClearPendingRedirect" });
       navigator.replace(safeRedirectTo);
     }
   }, [
     state.loginStatus,
-    state.pendingRedirect,
-    authDispatch,
     navigator,
     safeRedirectTo,
   ]);