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

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

lib/pages/boxing/parts/boxing_scan_part.dart

@@ -71,6 +71,13 @@ extension _BoxingScanPart on _BoxingPageState {
           : FeedbackEvent.scanValid,
     );
 
+    final attSummary = result.attachmentSummary;
+    final pending =
+        attSummary != null &&
+        attSummary['determination'] == 'has' &&
+        attSummary['all_complete'] != true;
+    final pendingCount = attSummary?['pending_count'] as int? ?? 0;
+
     setState(() {
       _zongpaiNo = zongpai;
       _paichanNo = result.paichanNo;
@@ -87,6 +94,8 @@ extension _BoxingScanPart on _BoxingPageState {
       _deletingAssignedItemId = null;
       _completedJumpBoxNo = null;
       _statusOverrideText = null;
+      _attachmentPending = pending;
+      _attachmentPendingCount = pendingCount;
       if (_mode == BoxingMode.singleCode) {
         _paichanSwitchNotice = null;
       }