feat(android): add attachment pending banner on boxing page

Co-Authored-By: Claude <noreply@anthropic.com>

lib/pages/boxing/widgets/boxing_notice_banners.dart

@@ -12,6 +12,8 @@ class BoxingNoticeBanners extends StatelessWidget {
   final int remainingQuantity;
   final String? zongpaiNo;
   final int? completedJumpBoxNo;
+  final bool attachmentPending;
+  final int attachmentPendingCount;
   final VoidCallback onJumpToCompletedBox;
 
   const BoxingNoticeBanners({
@@ -26,6 +28,8 @@ class BoxingNoticeBanners extends StatelessWidget {
     required this.remainingQuantity,
     required this.zongpaiNo,
     required this.completedJumpBoxNo,
+    this.attachmentPending = false,
+    this.attachmentPendingCount = 0,
     required this.onJumpToCompletedBox,
   });
 
@@ -76,6 +80,21 @@ class BoxingNoticeBanners extends StatelessWidget {
         ),
       );
     }
+    if (attachmentPending) {
+      banners.add(
+        _NoticeBanner(
+          icon: Icon(
+            Icons.warning_amber,
+            size: 14,
+            color: Colors.amber.shade900,
+          ),
+          text: '本单有附件，尚未到齐（剩 $attachmentPendingCount 种）',
+          background: Colors.amber.shade50,
+          foreground: Colors.amber.shade900,
+          border: Colors.amber.shade200,
+        ),
+      );
+    }
     if (isDuplicateBoxNo && phase == BoxingPhase.scanned) {
       banners.add(
         _NoticeBanner(