fix: resolve all TypeScript build errors

- Remove unused imports (LoginModal, Zap) and variables
- Fix Language type mismatches across components
- Update HeaderBar interface to use Language type
- Remove unused onLoginClick parameter
- Fix duplicate translation keys by renaming auth steps
- Remove invalid language prop from CommunitySection

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

web/src/App.tsx

@@ -8,13 +8,11 @@ import { RegisterPage } from './components/RegisterPage';
 import { CompetitionPage } from './components/CompetitionPage';
 import { LandingPage } from './pages/LandingPage';
 import HeaderBar from './components/landing/HeaderBar';
-import LoginModal from './components/landing/LoginModal';
 import AILearning from './components/AILearning';
 import { LanguageProvider, useLanguage } from './contexts/LanguageContext';
 import { AuthProvider, useAuth } from './contexts/AuthContext';
 import { t, type Language } from './i18n/translations';
 import { useSystemConfig } from './hooks/useSystemConfig';
-import { Zap } from 'lucide-react';
 import type {
   SystemStatus,
   AccountInfo,
@@ -45,7 +43,6 @@ function App() {
   const { user, token, logout, isLoading } = useAuth();
   const { config: systemConfig, loading: configLoading } = useSystemConfig();
   const [route, setRoute] = useState(window.location.pathname);
-  const [showLoginModal, setShowLoginModal] = useState(false);
 
   // 从URL路径读取初始页面状态（支持刷新保持页面）
   const getInitialPage = (): Page => {
@@ -216,7 +213,7 @@ function App() {
     return (
       <div className="min-h-screen" style={{ background: '#000000', color: '#EAECEF' }}>
         <HeaderBar 
-          onLoginClick={() => setShowLoginModal(true)} 
+ 
           isLoggedIn={!!user} 
           currentPage="competition"
           language={language}
@@ -269,7 +266,7 @@ function App() {
   return (
     <div className="min-h-screen" style={{ background: 'var(--brand-black)', color: 'var(--brand-light-gray)' }}>
       <HeaderBar 
-        onLoginClick={() => setShowLoginModal(true)} 
+ 
         isLoggedIn={!!user} 
         isHomePage={false}
         currentPage={currentPage}

web/src/components/LoginPage.tsx

@@ -57,7 +57,7 @@ export function LoginPage() {
         isHomePage={false}
         currentPage="login"
         language={language}
-        onLanguageChange={(lang) => {}}
+        onLanguageChange={() => {}}
         onPageChange={(page) => {
           console.log('LoginPage onPageChange called with:', page);
           if (page === 'competition') {

web/src/components/landing/HeaderBar.tsx

@@ -1,22 +1,22 @@
 import { useState, useEffect, useRef } from 'react'
 import { motion } from 'framer-motion'
 import { Menu, X, ChevronDown } from 'lucide-react'
-import { t } from '../../i18n/translations'
+import { t, type Language } from '../../i18n/translations'
 
 interface HeaderBarProps {
-  onLoginClick: () => void
+  onLoginClick?: () => void
   isLoggedIn?: boolean
   isHomePage?: boolean
   currentPage?: string
-  language?: string
-  onLanguageChange?: (lang: string) => void
+  language?: Language
+  onLanguageChange?: (lang: Language) => void
   user?: { email: string } | null
   onLogout?: () => void
   isAdminMode?: boolean
   onPageChange?: (page: string) => void
 }
 
-export default function HeaderBar({ onLoginClick, isLoggedIn = false, isHomePage = false, currentPage, language = 'zh', onLanguageChange, user, onLogout, isAdminMode = false, onPageChange }: HeaderBarProps) {
+export default function HeaderBar({ isLoggedIn = false, isHomePage = false, currentPage, language = 'zh' as Language, onLanguageChange, user, onLogout, isAdminMode = false, onPageChange }: HeaderBarProps) {
   const [mobileMenuOpen, setMobileMenuOpen] = useState(false)
   const [languageDropdownOpen, setLanguageDropdownOpen] = useState(false)
   const [userDropdownOpen, setUserDropdownOpen] = useState(false)

web/src/i18n/translations.ts

@@ -301,12 +301,12 @@ export const translations = {
     scanQRCodeInstructions: 'Scan this QR code with Google Authenticator or Authy',
     otpSecret: 'Or enter this secret manually:',
     qrCodeHint: 'QR code (if scanning fails, use the secret below):',
-    step1Title: 'Step 1: Install Google Authenticator',
-    step1Desc: 'Download and install Google Authenticator from your app store',
-    step2Title: 'Step 2: Add account',
-    step2Desc: 'Tap "+", then choose "Scan QR code" or "Enter a setup key"',
-    step3Title: 'Step 3: Verify setup',
-    step3Desc: 'After setup, continue to enter the 6-digit code',
+    authStep1Title: 'Step 1: Install Google Authenticator',
+    authStep1Desc: 'Download and install Google Authenticator from your app store',
+    authStep2Title: 'Step 2: Add account',
+    authStep2Desc: 'Tap "+", then choose "Scan QR code" or "Enter a setup key"',
+    authStep3Title: 'Step 3: Verify setup',
+    authStep3Desc: 'After setup, continue to enter the 6-digit code',
     setupCompleteContinue: 'I have completed setup, continue',
     copy: 'Copy',
     completeRegistration: 'Complete Registration',
@@ -713,12 +713,12 @@ export const translations = {
     scanQRCodeInstructions: '使用Google Authenticator或Authy扫描此二维码',
     otpSecret: '或手动输入此密钥：',
     qrCodeHint: '二维码（如果无法扫描，请使用下方密钥）：',
-    step1Title: '步骤1：下载Google Authenticator',
-    step1Desc: '在手机应用商店下载并安装Google Authenticator应用',
-    step2Title: '步骤2：添加账户',
-    step2Desc: '在应用中点击“+”，选择“扫描二维码”或“手动输入密钥”',
-    step3Title: '步骤3：验证设置',
-    step3Desc: '设置完成后，点击下方按钮输入6位验证码',
+    authStep1Title: '步骤1：下载Google Authenticator',
+    authStep1Desc: '在手机应用商店下载并安装Google Authenticator应用',
+    authStep2Title: '步骤2：添加账户',
+    authStep2Desc: '在应用中点击“+”，选择“扫描二维码”或“手动输入密钥”',
+    authStep3Title: '步骤3：验证设置',
+    authStep3Desc: '设置完成后，点击下方按钮输入6位验证码',
     setupCompleteContinue: '我已完成设置，继续',
     copy: '复制',
     completeRegistration: '完成注册',

web/src/pages/LandingPage.tsx

@@ -47,7 +47,7 @@ export function LandingPage() {
       <AboutSection language={language} />
       <FeaturesSection language={language} />
       <HowItWorksSection language={language} />
-      <CommunitySection language={language} />
+      <CommunitySection />
 
       {/* CTA */}
       <AnimatedSection backgroundColor='var(--panel-bg)'>