fix：splash 界面重定向界面问题

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

@@ -1,48 +1,63 @@
 "use client";
 /**
- * 认证全屏页面
+ * Auth 屏
  *
- * 实现方式与 SplashScreen 同款（MobileShell 顶层 + 内部 .wrapper + 背景组件）：
- *   - <MobileShell> 作为 top-level（500px 移动端宽度由 MobileShell 自身约束）
- *   - <AuthBackground> 提供全屏 bg image
- *   - .content 内部承载 AuthPanel（z-index: 2，垂直居中）
- *   - 已登录用户：自动跳 /chat
- *   - 登录成功：通知 ChatBloc + UserBloc
+ * 原始 Dart: lib/ui/auth/auth_screen.dart
  */
-import { useEffect, useRef } from "react";
+import { useEffect } from "react";
 import { useRouter } from "next/navigation";
 
-import { useAuthState } from "@/stores/auth/auth-context";
+import { MobileShell } from "@/app/_components/core/mobile-shell";
+
+import { useAuthDispatch, useAuthState } from "@/stores/auth/auth-context";
 import { useChatDispatch } from "@/stores/chat/chat-context";
 import { useUserDispatch } from "@/stores/user/user-context";
 import { ROUTES } from "@/router/routes";
-import { MobileShell } from "@/app/_components/core/mobile-shell";
-import { AuthPanel } from "@/app/auth/components/auth-panel";
-import { AuthBackground } from "@/app/auth/components/auth-background";
-
 import styles from "./auth-screen.module.css";
 
+import { AuthBackground } from "./auth-background";
+import { AuthPanel } from "./auth-panel";
+
 export function AuthScreen() {
   // ===== 鉴权路由跳转已由 src/router/proxy.ts 集中处理 =====
   // 本组件只负责：
-  //   1. 渲染登录面板
-  //   2. 登录成功后初始化 chat/user store + navigate 到 /chat（业务层动作）
+  //   1. 渲染登录 UI
+  //   2. 邮箱登录成功 → 初始化 chat/user store + navigate 到 /chat（业务层动作）
 
-  const router = useRouter();
   const state = useAuthState();
+  const authDispatch = useAuthDispatch();
   const chatDispatch = useChatDispatch();
   const userDispatch = useUserDispatch();
-  const wasSuccess = useRef(false);
+  const router = useRouter();
 
   // 邮箱登录成功 → 通知 Chat + User + 跳转
+  // 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。
   useEffect(() => {
-    if (state.isSuccess && !wasSuccess.current) {
-      wasSuccess.current = true;
+    console.log("[auth-screen] useEffect (loginStatus + pendingRedirect)", {
+      pending: state.pendingRedirect,
+      loginStatus: state.loginStatus,
+      willRedirect:
+        state.pendingRedirect && state.loginStatus !== "notLoggedIn",
+    });
+
+    if (state.pendingRedirect && state.loginStatus !== "notLoggedIn") {
+      console.log(
+        "[auth-screen] useEffect → router.replace(/chat) [via pendingRedirect flag]",
+      );
+      authDispatch({ type: "AuthClearPendingRedirect" });
       chatDispatch({ type: "ChatAuthStatusChanged" });
       userDispatch({ type: "UserInit" });
       router.replace(ROUTES.chat);
     }
-  }, [state.isSuccess, chatDispatch, userDispatch, router]);
+  }, [
+    state.loginStatus,
+    state.pendingRedirect,
+    authDispatch,
+    chatDispatch,
+    userDispatch,
+    router,
+  ]);
 
   return (
     <MobileShell>