refactor(PostCard, PostCard.legacy): remove legacy PostCard component and update exports

- Deleted the legacy PostCard component to streamline the codebase and improve maintainability.
- Updated exports in PostCard and index files to remove references to the legacy component.
- Adjusted PostCardProps to eliminate legacy properties, ensuring only the new API is supported.
- Enhanced the PostCard component to focus on modern implementation and features.

src/screens/profile/index.ts

@@ -2,6 +2,10 @@
  * 个人中心模块导出
  */
 
+// 统一的用户主页组件
+export { UserProfileScreen } from './UserProfileScreen';
+
+// 兼容旧组件（内部使用 UserProfileScreen）
 export { ProfileScreen } from './ProfileScreen';
 export { SettingsScreen } from './SettingsScreen';
 export { EditProfileScreen } from './EditProfileScreen';
@@ -10,3 +14,7 @@ export { default as FollowListScreen } from './FollowListScreen';
 export { NotificationSettingsScreen } from './NotificationSettingsScreen';
 export { BlockedUsersScreen } from './BlockedUsersScreen';
 export { AccountSecurityScreen } from './AccountSecurityScreen';
+
+// 导出 Hook 供需要自定义的场景使用
+export { useUserProfile, sharedStyles, TABS, TAB_ICONS } from './useUserProfile';
+export type { ProfileMode, UseUserProfileOptions, UseUserProfileReturn } from './useUserProfile';