feat: add translate

src/contexts/LanguageContext.tsx

@@ -0,0 +1,39 @@
+import React, { createContext, useContext, useState, useEffect } from 'react';
+import { translations, Language, TranslationKey } from '../lib/translations';
+
+interface LanguageContextType {
+  language: Language;
+  setLanguage: (lang: Language) => void;
+  t: TranslationKey;
+}
+
+const LanguageContext = createContext<LanguageContextType | undefined>(undefined);
+
+export const LanguageProvider: React.FC<{ children: React.ReactNode }> = ({ children }) => {
+  const [language, setLanguageState] = useState<Language>(() => {
+    const saved = localStorage.getItem('language');
+    if (saved === 'en' || saved === 'zh') return saved;
+    return navigator.language.startsWith('zh') ? 'zh' : 'en';
+  });
+
+  const setLanguage = (lang: Language) => {
+    setLanguageState(lang);
+    localStorage.setItem('language', lang);
+  };
+
+  const t = translations[language];
+
+  return (
+    <LanguageContext.Provider value={{ language, setLanguage, t }}>
+      {children}
+    </LanguageContext.Provider>
+  );
+};
+
+export const useLanguage = () => {
+  const context = useContext(LanguageContext);
+  if (context === undefined) {
+    throw new Error('useLanguage must be used within a LanguageProvider');
+  }
+  return context;
+};