fix(ui): adjust keyboard handling and prevent duplicate view recording

- Fix keyboard avoidance logic in PostDetailScreen and ChatScreen by applying manual keyboard height offsets only on Android, preventing double padding on iOS.
- Prevent multiple view recording calls in TradeDetailScreen by using a ref to track if the view has already been recorded.

src/screens/home/PostDetailScreen.tsx

@@ -1401,7 +1401,7 @@ export const PostDetailScreen: React.FC = () => {
       {
         paddingHorizontal: responsivePadding,
         paddingVertical: responsiveGap,
-        paddingBottom: keyboardHeight + responsiveGap + insets.bottom,
+        paddingBottom: (Platform.OS === 'android' ? keyboardHeight : 0) + responsiveGap + insets.bottom,
       }
     ]}>
       {/* 回复提示 */}
@@ -1486,6 +1486,8 @@ export const PostDetailScreen: React.FC = () => {
             minHeight={60}
             autoExpand
             style={styles.expandedTextInput}
+            returnKeyType="send"
+            onSubmitEditing={handleSendComment}
           />
 
           {/* Image preview */}

src/screens/message/ChatScreen.tsx

@@ -545,7 +545,8 @@ export const ChatScreen: React.FC<ChatScreenProps> = (props) => {
       </View>
 
       {/* 底部区域：输入框 + 面板 */}
-      <View style={{ marginBottom: keyboardHeight > 0 ? keyboardHeight : 0 }}>
+      {/* iOS 由外层 KeyboardAvoidingView(behavior=padding) 处理键盘避让；Android 需要手动推起 */}
+      <View style={{ marginBottom: Platform.OS === 'android' && keyboardHeight > 0 ? keyboardHeight : 0 }}>
         {/* 输入框区域 */}
         <View
           style={[inputWrapperStyle, insets.bottom > 0 && { paddingBottom: insets.bottom }]}

src/screens/trade/TradeDetailScreen.tsx

@@ -1,4 +1,4 @@
-import React, { useState, useEffect, useCallback, useMemo } from 'react';
+import React, { useState, useEffect, useCallback, useMemo, useRef } from 'react';
 import {
   View,
   ScrollView,
@@ -519,6 +519,7 @@ export function TradeDetailScreen({ tradeId }: TradeDetailScreenProps) {
   const [item, setItem] = useState<TradeItemDetailDTO | null>(null);
   const [loading, setLoading] = useState(true);
   const [manageModalVisible, setManageModalVisible] = useState(false);
+  const hasRecordedView = useRef(false);
   const [showImageModal, setShowImageModal] = useState(false);
   const [selectedImageIndex, setSelectedImageIndex] = useState(0);
 
@@ -548,7 +549,8 @@ export function TradeDetailScreen({ tradeId }: TradeDetailScreenProps) {
   }, [fetchItem]);
 
   useEffect(() => {
-    if (tradeId) {
+    if (tradeId && !hasRecordedView.current) {
+      hasRecordedView.current = true;
       tradeService.recordView(tradeId).catch(() => {});
     }
   }, [tradeId]);