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

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;
+      }
     }
   )
 );