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/postManager.ts

@@ -63,7 +63,7 @@ class PostManager extends CacheBus<PostManagerSnapshot, PostManagerEvent> {
   }
 
   async getPosts(
-    type = 'recommend',
+    type = 'hot',
     page = 1,
     pageSize = 20,
     forceRefresh = false