feat(website): 独立注册页 /register(邮箱/邀请码预填+验证码注册+平台匹配下载)+ 主页/落地页跳转接入 + 登录态隐藏注册入口

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01P9G7E3wmAYL9KeYCVZVsqu

web/website/src/components/Header.jsx

@@ -6,6 +6,7 @@
 import { useEffect, useRef, useState } from 'react';
 import { Download, Menu } from 'lucide-react';
 import { SITE } from '../config/site';
+import { isLoggedIn, getStoredEmail, clearStoredSession } from '../lib/authState';
 
 function Mark() {
   return (
@@ -42,24 +43,15 @@ export default function Header({ lang = 'zh', t = {} }) {
   const displayName = (email && email.split('@')[0]) || 'Account';
 
   // 与用户中心同源：登录后 localStorage 存 pg_uc_refresh（+ pg_uc_email）→ 显示用户名下拉。
+  // 判断逻辑单一实现见 lib/authState.js（AnnouncementBar/SignupForm/RegisterCard/InviteCard 同源复用）。
   useEffect(() => {
-    try {
-      setLoggedIn(!!localStorage.getItem('pg_uc_refresh'));
-      setEmail(localStorage.getItem('pg_uc_email') || '');
-    } catch {
-      setLoggedIn(false);
-    }
+    setLoggedIn(isLoggedIn());
+    setEmail(getStoredEmail());
   }, []);
 
   // 清登录态并跳转（切换用户 = 回登录页；退出 = 回主页）。
-  const clearSession = () => {
-    try {
-      localStorage.removeItem('pg_uc_refresh');
-      localStorage.removeItem('pg_uc_email');
-    } catch { /* ignore */ }
-  };
-  const onSwitch = () => { clearSession(); window.location.href = loginHref; };
-  const onLogout = () => { clearSession(); window.location.href = '/'; };
+  const onSwitch = () => { clearStoredSession(); window.location.href = loginHref; };
+  const onLogout = () => { clearStoredSession(); window.location.href = '/'; };
 
   useEffect(() => {
     if (!langOpen) return;