fix: language switching now strictly follows URL path

- Remove localStorage dependency for language persistence
- Add route change listener for language updates
- Simplify language switching logic
- Fix language reset issue when refreshing /en pages

lib/global.js

@@ -87,9 +87,35 @@ export function GlobalContextProvider(props) {
     }
   }
 
+  // 添加路由变化时的语言处理
+  useEffect(() => {
+    const handleRouteChange = (url) => {
+      // 从路径中提取语言前缀
+      const pathSegments = url.split('/')
+      const pathLang = pathSegments[1]
+      
+      // 检查是否是有效的语言路径
+      if (pathLang === 'en' || pathLang === 'zh') {
+        const targetLang = pathLang === 'en' ? 'en-US' : 'zh-CN'
+        
+        // 直接更新语言，不使用 localStorage
+        updateLang(targetLang)
+        updateLocale(generateLocaleDict(targetLang))
+      }
+    }
+
+    // 初始化时处理当前路径
+    handleRouteChange(router.asPath)
+
+    // 监听路由变化
+    router.events.on('routeChangeComplete', handleRouteChange)
+    return () => {
+      router.events.off('routeChangeComplete', handleRouteChange)
+    }
+  }, [router])
+
   useEffect(() => {
     initDarkMode(updateDarkMode, defaultDarkMode)
-    initLocale(lang, locale, updateLang, updateLocale)
     if (
       NOTION_CONFIG?.REDIRECT_LANG &&
       JSON.parse(NOTION_CONFIG?.REDIRECT_LANG)