refactor(ImageGallery, HomeScreen, PostService, UserStore): streamline post type handling and improve tab navigation

- Updated ImageGallery to manage loading states more effectively and prevent unnecessary updates.
- Refactored HomeScreen to remove the 'recommend' post type, simplifying the post type options.
- Adjusted PostService and UserStore to eliminate references to 'recommend', ensuring consistency across the application.
- Enhanced tab navigation in SimpleMobileTabNavigator to optimize rendering and manage mounted tabs more efficiently.
- Improved error handling and loading states in various components for better user experience.

src/stores/userStore.ts

@@ -34,7 +34,7 @@ interface UserState {
   // 操作
   fetchUser: (userId: string) => Promise<User | undefined>;
   fetchUserPosts: (userId: string, page?: number) => Promise<Post[]>;
-  fetchPosts: (type: 'recommend' | 'follow' | 'hot' | 'latest', page?: number) => Promise<PaginatedData<Post>>;
+  fetchPosts: (type: 'follow' | 'hot' | 'latest', page?: number) => Promise<PaginatedData<Post>>;
   fetchNotifications: (type?: string, page?: number) => Promise<Notification[]>;
   markNotificationAsRead: (notificationId: string) => Promise<void>;
   markAllNotificationsAsRead: () => Promise<void>;
@@ -108,16 +108,13 @@ export const useUserStore = create<UserState>((set, get) => {
     },
     
     // 获取帖子列表（首页）
-    fetchPosts: async (type: 'recommend' | 'follow' | 'hot' | 'latest', page = 1) => {
+    fetchPosts: async (type: 'follow' | 'hot' | 'latest', page = 1) => {
       set({ isLoadingPosts: true });
       
       try {
         let response;
         
         switch (type) {
-          case 'recommend':
-            response = await postService.getRecommendedPosts(page);
-            break;
           case 'follow':
             response = await postService.getFollowingPosts(page);
             break;
@@ -332,7 +329,7 @@ export const useUserStore = create<UserState>((set, get) => {
     // 刷新所有数据
     refreshAll: async () => {
       await Promise.all([
-        get().fetchPosts('recommend', 1),
+        get().fetchPosts('latest', 1),
         get().fetchNotificationBadge(),
       ]);
     },