feat: simplify workspace account UI and geo language defaults

src/components/LeftSidebar.tsx

@@ -1,5 +1,5 @@
 import React, { useState, useRef, useCallback, useEffect } from 'react';
-import { Upload, LogOut, FileText, Clock, ChevronLeft, ChevronRight, MousePointerClick, FileUp, ClipboardPaste, Loader2 } from 'lucide-react';
+import { Upload, FileText, Clock, ChevronLeft, ChevronRight, MousePointerClick, FileUp, ClipboardPaste, Loader2 } from 'lucide-react';
 import { useAuth } from '../contexts/AuthContext';
 import { useLanguage } from '../contexts/LanguageContext';
 import { FileRecord } from '../types';
@@ -37,12 +37,11 @@ export default function LeftSidebar({
   historyEnabled,
   onToggleHistory,
 }: LeftSidebarProps) {
-  const { user, signOut } = useAuth();
+  const { user } = useAuth();
   const { t } = useLanguage();
   const [isDragging, setIsDragging] = useState(false);
   const fileInputRef = useRef<HTMLInputElement>(null);
   const listRef = useRef<HTMLDivElement>(null);
-  const displayName = user?.username?.trim() || user?.email || '';
 
   // Handle scroll to load more
   const handleScroll = useCallback(() => {
@@ -308,29 +307,6 @@ export default function LeftSidebar({
             )}
           </div>
         </div>
-
-        {/* Bottom Area: User info (only shown when logged in) */}
-        {user && (
-          <div className="p-4 border-t border-gray-100 bg-gray-50/30">
-            <div className="flex items-center gap-3 p-2 rounded-lg bg-white border border-gray-100 shadow-sm">
-              <div className="w-8 h-8 bg-gray-900 rounded-full flex items-center justify-center flex-shrink-0">
-                <svg width="16" height="16" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
-                  <path d="M12 12C14.21 12 16 10.21 16 8C16 5.79 14.21 4 12 4C9.79 4 8 5.79 8 8C8 10.21 9.79 12 12 12ZM12 14C9.33 14 4 15.34 4 18V20H20V18C20 15.34 14.67 14 12 14Z" fill="white" />
-                </svg>
-              </div>
-              <div className="flex-1 min-w-0">
-                <p className="text-sm font-medium text-gray-900 truncate">{displayName}</p>
-              </div>
-              <button
-                onClick={() => signOut()}
-                className="p-1.5 text-gray-400 hover:text-red-500 hover:bg-red-50 rounded-md transition-colors"
-                title={t.common.logout}
-              >
-                <LogOut size={16} />
-              </button>
-            </div>
-          </div>
-        )}
       </div>
     </>
   );

src/components/layout/MarketingNavbar.tsx

@@ -111,14 +111,6 @@ export default function MarketingNavbar() {
                 </div>
                 {userMenuOpen && (
                   <div className="nav-user-menu" style={{ display: 'block' }}>
-                    <div className="nav-menu-divider" />
-                    <Link to="/app" className="nav-menu-item" onClick={() => setUserMenuOpen(false)}>
-                      <svg width="15" height="15" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.8">
-                        <rect x="2" y="3" width="20" height="14" rx="2" />
-                        <path d="M8 21h8M12 17v4" />
-                      </svg>
-                      {language === 'zh' ? '启动应用' : 'Launch App'}
-                    </Link>
                     <div className="nav-menu-divider" />
                     <button
                       className="nav-menu-item nav-menu-logout"

src/contexts/LanguageContext.tsx

@@ -12,12 +12,11 @@ interface LanguageContextType {
 const LanguageContext = createContext<LanguageContextType | undefined>(undefined);
 
 export const LanguageProvider: React.FC<{ children: React.ReactNode }> = ({ children }) => {
-  // 初始化语言：优先使用 localStorage，否则使用浏览器语言作为临时值
+  // 初始化语言：优先使用 localStorage，否则默认英文，后续由 IP 检测决定
   const [language, setLanguageState] = useState<Language>(() => {
     const saved = localStorage.getItem('language');
     if (saved === 'en' || saved === 'zh') return saved;
-    // 临时使用浏览器语言，后续会被IP检测覆盖（如果没有保存的语言）
-    return navigator.language.startsWith('zh') ? 'zh' : 'en';
+    return 'en';
   });
 
   // 检测IP地理位置并设置语言（仅在首次加载且没有保存的语言时）
@@ -30,16 +29,14 @@ export const LanguageProvider: React.FC<{ children: React.ReactNode }> = ({ chil
       return;
     }
 
-    // 异步检测IP并设置语言
+    // 异步检测IP并设置语言：中国 IP 显示中文，其余显示英文
     detectLanguageByIP()
       .then((detectedLang) => {
         setLanguageState(detectedLang);
         updatePageMeta(detectedLang); // Update meta tags after detection
-        // 注意：这里不保存到 localStorage，让用户首次访问时使用IP检测的结果
-        // 如果用户手动切换语言，才会保存到 localStorage
       })
       .catch((error) => {
-        // IP检测失败时，保持使用浏览器语言检测的结果
+        // IP检测失败时，保持英文默认值
         console.warn('Failed to detect language by IP:', error);
         updatePageMeta(language); // Update with fallback language
       });

src/lib/ipLocation.ts

@@ -47,24 +47,11 @@ export async function detectCountryByIP(): Promise<string | null> {
 /**
  * 根据国家代码判断应该使用的语言
  * 
- * @param countryCode 国家代码（如 'CN', 'TW', 'HK', 'SG' 等）
+ * @param countryCode 国家代码（如 'CN', 'US'）
  * @returns 'zh' | 'en' 推荐的语言
  */
 export function getLanguageByCountry(countryCode: string | null): 'zh' | 'en' {
-  if (!countryCode) {
-    return 'en';
-  }
-
-  // 中文地区列表
-  const chineseRegions = [
-    'CN', // 中国大陆
-    'TW', // 台湾
-    'HK', // 香港
-    'MO', // 澳门
-    'SG', // 新加坡（主要使用中文）
-  ];
-
-  return chineseRegions.includes(countryCode) ? 'zh' : 'en';
+  return countryCode === 'CN' ? 'zh' : 'en';
 }
 
 /**