fix(i18n): harden language switching and enforce language list consistency

src/components/layout/MainLayout.tsx

@@ -36,7 +36,7 @@ import {
 import { configApi, versionApi } from '@/services/api';
 import { triggerHeaderRefresh } from '@/hooks/useHeaderRefresh';
 import { LANGUAGE_LABEL_KEYS, LANGUAGE_ORDER } from '@/utils/constants';
-import type { Language } from '@/types';
+import { isSupportedLanguage } from '@/utils/language';
 
 const sidebarIcons: Record<string, ReactNode> = {
   dashboard: <IconLayoutDashboard size={18} />,
@@ -196,7 +196,11 @@ export function MainLayout() {
 
   const handleLanguageChange = useCallback(
     (event: React.ChangeEvent<HTMLSelectElement>) => {
-      setLanguage(event.target.value as Language);
+      const selectedLanguage = event.target.value;
+      if (!isSupportedLanguage(selectedLanguage)) {
+        return;
+      }
+      setLanguage(selectedLanguage);
     },
     [setLanguage]
   );

src/pages/LoginPage.tsx

@@ -7,8 +7,9 @@ import { IconEye, IconEyeOff } from '@/components/ui/icons';
 import { useAuthStore, useLanguageStore, useNotificationStore } from '@/stores';
 import { detectApiBaseFromLocation, normalizeApiBase } from '@/utils/connection';
 import { LANGUAGE_LABEL_KEYS, LANGUAGE_ORDER } from '@/utils/constants';
+import { isSupportedLanguage } from '@/utils/language';
 import { INLINE_LOGO_JPEG } from '@/assets/logoInline';
-import type { ApiError, Language } from '@/types';
+import type { ApiError } from '@/types';
 import styles from './LoginPage.module.scss';
 
 /**
@@ -81,7 +82,11 @@ export function LoginPage() {
   const detectedBase = useMemo(() => detectApiBaseFromLocation(), []);
   const handleLanguageChange = useCallback(
     (event: React.ChangeEvent<HTMLSelectElement>) => {
-      setLanguage(event.target.value as Language);
+      const selectedLanguage = event.target.value;
+      if (!isSupportedLanguage(selectedLanguage)) {
+        return;
+      }
+      setLanguage(selectedLanguage);
     },
     [setLanguage]
   );

src/stores/useLanguageStore.ts

@@ -8,11 +8,11 @@ import { persist } from 'zustand/middleware';
 import type { Language } from '@/types';
 import { LANGUAGE_ORDER, STORAGE_KEY_LANGUAGE } from '@/utils/constants';
 import i18n from '@/i18n';
-import { getInitialLanguage } from '@/utils/language';
+import { getInitialLanguage, isSupportedLanguage } from '@/utils/language';
 
 interface LanguageState {
   language: Language;
-  setLanguage: (language: Language) => void;
+  setLanguage: (language: string) => void;
   toggleLanguage: () => void;
 }
 
@@ -22,6 +22,9 @@ export const useLanguageStore = create<LanguageState>()(
       language: getInitialLanguage(),
 
       setLanguage: (language) => {
+        if (!isSupportedLanguage(language)) {
+          return;
+        }
         // 切换 i18next 语言
         i18n.changeLanguage(language);
         set({ language });
@@ -35,7 +38,18 @@ export const useLanguageStore = create<LanguageState>()(
       }
     }),
     {
-      name: STORAGE_KEY_LANGUAGE
+      name: STORAGE_KEY_LANGUAGE,
+      merge: (persistedState, currentState) => {
+        const nextLanguage = (persistedState as Partial<LanguageState>)?.language;
+        if (typeof nextLanguage === 'string' && isSupportedLanguage(nextLanguage)) {
+          return {
+            ...currentState,
+            ...(persistedState as Partial<LanguageState>),
+            language: nextLanguage
+          };
+        }
+        return currentState;
+      }
     }
   )
 );

src/utils/constants.ts

@@ -5,6 +5,10 @@
 
 import type { Language } from '@/types';
 
+const defineLanguageOrder = <T extends readonly Language[]>(
+  languages: T & ([Language] extends [T[number]] ? unknown : never)
+) => languages;
+
 // 缓存过期时间（毫秒）
 export const CACHE_EXPIRY_MS = 30 * 1000; // 与基线保持一致，减少管理端压力
 
@@ -36,13 +40,13 @@ export const STORAGE_KEY_SIDEBAR = 'cli-proxy-sidebar-collapsed';
 export const STORAGE_KEY_AUTH_FILES_PAGE_SIZE = 'cli-proxy-auth-files-page-size';
 
 // 语言配置
-export const LANGUAGE_ORDER: Language[] = ['zh-CN', 'en', 'ru'];
+export const LANGUAGE_ORDER = defineLanguageOrder(['zh-CN', 'en', 'ru'] as const);
 export const LANGUAGE_LABEL_KEYS: Record<Language, string> = {
   'zh-CN': 'language.chinese',
   en: 'language.english',
   ru: 'language.russian'
 };
-export const SUPPORTED_LANGUAGES: Language[] = LANGUAGE_ORDER;
+export const SUPPORTED_LANGUAGES = LANGUAGE_ORDER;
 
 // 通知持续时间
 export const NOTIFICATION_DURATION_MS = 3000;

src/utils/language.ts

@@ -1,16 +1,19 @@
 import type { Language } from '@/types';
 import { STORAGE_KEY_LANGUAGE, SUPPORTED_LANGUAGES } from '@/utils/constants';
 
+export const isSupportedLanguage = (value: string): value is Language =>
+  SUPPORTED_LANGUAGES.includes(value as Language);
+
 const parseStoredLanguage = (value: string): Language | null => {
   try {
     const parsed = JSON.parse(value);
     const candidate = parsed?.state?.language ?? parsed?.language ?? parsed;
-    if (SUPPORTED_LANGUAGES.includes(candidate as Language)) {
-      return candidate as Language;
+    if (typeof candidate === 'string' && isSupportedLanguage(candidate)) {
+      return candidate;
     }
   } catch {
-    if (SUPPORTED_LANGUAGES.includes(value as Language)) {
-      return value as Language;
+    if (isSupportedLanguage(value)) {
+      return value;
     }
   }
   return null;