refactor(home): redesign home screen with sort bar and add recommendation feed

- Replace PagerView-based tabs with modern sort bar navigation
- Add "推荐" (recommended) feed option with "hot" sort type
- Update tab icons and labels to match new sort paradigm
- Optimize PostCard, MessageBubble conditional styles

perf(chat): migrate FlatList to FlashList for emoji/sticker panels

- Improve virtualized rendering performance for emoji and sticker grids
- Fix jump-to-latest scroll behavior for inverted FlashList

perf(profile): extract user header and tab bar into separate memoized renders

- Prevent unnecessary re-renders when switching tabs

feat(api): add channel_id filter support for post queries

- Include channel_id in cursor pagination requests
- Update CursorPaginationRequest type definition

style(chat-info): redesign group and private chat info screens with flat layout

- Remove card borders and shadows for cleaner appearance
- Adjust avatar sizes and spacing for consistency

src/screens/message/components/ChatScreen/useChatScreen.ts

@@ -562,8 +562,17 @@ export const useChatScreen = (props?: ChatScreenProps) => {
   const jumpToLatestMessages = useCallback(() => {
     suppressAutoFollowRef.current = false;
     isBrowsingHistoryRef.current = false;
-    scrollToLatest(true, true, 'jump-latest-button');
-  }, [scrollToLatest]);
+    // FlashList 在 inverted 模式下 scrollToOffset({ offset: 0 }) 可能无法真正滚到最底部，
+    // 因为列表内容高度变化后最小 offset 可能不是 0。先尝试滚到负值确保到底，再补偿回 0。
+    isProgrammaticScrollRef.current = true;
+    flatListRef.current?.scrollToOffset({ offset: -99999, animated: false });
+    requestAnimationFrame(() => {
+      flatListRef.current?.scrollToOffset({ offset: 0, animated: true });
+      setTimeout(() => {
+        isProgrammaticScrollRef.current = false;
+      }, 220);
+    });
+  }, [flatListRef]);
 
   const setBrowsingHistory = useCallback((browsing: boolean) => {
     isBrowsingHistoryRef.current = browsing;