refactor(ai): optimize AI action initialization and user state handling

src/App.vue

@@ -16,23 +16,24 @@
 </template>
 
 <script setup lang="ts">
-import { useAppStore, useSettingsStore } from "@/store";
+import { useAppStore, useSettingsStore, useUserStore } from "@/store";
 import { defaultSettings } from "@/settings";
 import { ThemeMode, ComponentSize } from "@/enums";
 import AiAssistant from "@/components/AiAssistant/index.vue";
-import { AuthStorage } from "@/utils/auth";
 
 const appStore = useAppStore();
 const settingsStore = useSettingsStore();
+const userStore = useUserStore();
 
 const locale = computed(() => appStore.locale);
 const size = computed(() => appStore.size as ComponentSize);
 const showWatermark = computed(() => settingsStore.showWatermark);
 
 // 只有在启用 AI 助手且用户已登录时才显示
+// 使用 userInfo 作为响应式依赖，当用户退出登录时会自动更新
 const enableAiAssistant = computed(() => {
   const isEnabled = settingsStore.enableAiAssistant;
-  const isLoggedIn = !!AuthStorage.getAccessToken();
+  const isLoggedIn = userStore.userInfo && Object.keys(userStore.userInfo).length > 0;
   return isEnabled && isLoggedIn;
 });