style: 移除订单预览卡片阴影并添加边框

app/screens/previewOrder/perviewOrder.tsx

@@ -209,17 +209,19 @@ const styles = StyleSheet.create({
   card: {
     backgroundColor: "#ffffff", // White background for the card
     borderRadius: 12,          // Rounded corners
-    marginHorizontal: 15,      // Horizontal margin
+    // marginHorizontal: 15,   // Removed to align with parent section padding
     marginTop: 20,             // Margin from the top element
     padding: 18,               // Inner padding
-    shadowColor: "#000",       // Shadow for depth
-    shadowOffset: {
-      width: 0,
-      height: 2,
-    },
-    shadowOpacity: 0.1,
-    shadowRadius: 3.84,
-    elevation: 5,              // Elevation for Android
+    // shadowColor: "#000",    // Removed shadow
+    // shadowOffset: {
+    //   width: 0,
+    //   height: 2,
+    // },
+    // shadowOpacity: 0.1,
+    // shadowRadius: 3.84,
+    // elevation: 5,           // Removed elevation
+    borderWidth: 1,            // Add a border to define the card area
+    borderColor: "#e0e0e0",    // Light border color
   },
   cardTitle: {
     fontSize: 18,