优化

flutter_monisuo/lib/ui/pages/asset/transfer_page.dart

@@ -298,27 +298,30 @@ class _TransferPageState extends State<TransferPage> {
               ),
             ],
           ),
-          // 交换按钮 - 右侧贴分割线
+          // 交换按钮 - 右側居中分割線
           Positioned(
             right: 12,
             top: 20,
-            child: GestureDetector(
-              onTap: _toggleDirection,
-              child: Container(
-                width: 28,
-                height: 28,
-                decoration: BoxDecoration(
-                  color: colorScheme.surface,
-                  shape: BoxShape.circle,
-                  border: Border.all(
-                    color: colorScheme.outlineVariant,
-                    width: 1,
+            bottom: 20,
+            child: Center(
+              child: GestureDetector(
+                onTap: _toggleDirection,
+                child: Container(
+                  width: 28,
+                  height: 28,
+                  decoration: BoxDecoration(
+                    color: colorScheme.surface,
+                    shape: BoxShape.circle,
+                    border: Border.all(
+                      color: colorScheme.outlineVariant,
+                      width: 1,
+                    ),
+                  ),
+                  child: Icon(
+                    LucideIcons.repeat2,
+                    size: 13,
+                    color: colorScheme.onSurfaceVariant,
                   ),
-                ),
-                child: Icon(
-                  LucideIcons.arrowUpDown,
-                  size: 14,
-                  color: colorScheme.onSurfaceVariant,
                 ),
               ),
             ),