improve single-code boxing UX: preserve state, fix work order display, add double-vibrate alert

- Keep UI state after boxing completion for operator review instead of auto-reset
- Show real work order number instead of hardcoded "本次扫码" in assigned list
- Add double-vibration feedback when re-scanning already completed zongpai
- Change completed status banner and dot from green to red for clearer warning

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/pages/boxing_page.dart

@@ -344,7 +344,19 @@ class _BoxingPageState extends State<BoxingPage> with WidgetsBindingObserver {
       return false;
     }
 
-    _feedbackService.trigger(FeedbackEvent.scanValid);
+    // 判断该总牌号是否已全部装箱完毕
+    final packedQuantity = result.currentZongpaiBoxes.fold<int>(
+      0,
+      (sum, item) => sum + item.quantity,
+    );
+    final totalQuantity = result.quantity ?? 0;
+    final alreadyCompleted = totalQuantity > 0 && packedQuantity >= totalQuantity;
+
+    _feedbackService.trigger(
+      alreadyCompleted
+          ? FeedbackEvent.alreadyCompleted
+          : FeedbackEvent.scanValid,
+    );
 
     setState(() {
       _zongpaiNo = zongpai;
@@ -686,9 +698,6 @@ class _BoxingPageState extends State<BoxingPage> with WidgetsBindingObserver {
             StatusDotColor.green,
             const Duration(milliseconds: 1500),
           );
-          Future.delayed(const Duration(milliseconds: 1500), () {
-            if (mounted) setState(() => _resetState());
-          });
         } else {
           setState(() {
             _phase = _Phase.scanned;
@@ -1285,7 +1294,7 @@ class _BoxingPageState extends State<BoxingPage> with WidgetsBindingObserver {
       case _Phase.scanned:
         _statusDot = StatusDotColor.blue;
         if (_remainingQuantity <= 0) {
-          _statusDot = StatusDotColor.green;
+          _statusDot = StatusDotColor.red;
           _statusText = '该总排号已全部装箱完毕';
           return;
         }
@@ -1423,11 +1432,11 @@ class _BoxingPageState extends State<BoxingPage> with WidgetsBindingObserver {
         _remainingQuantity <= 0) {
       banners.add(
         _noticeBanner(
-          icon: Icon(Icons.check, size: 14, color: Colors.green.shade800),
+          icon: Icon(Icons.warning, size: 14, color: Colors.red.shade800),
           text: '${_zongpaiNo!} 已全部装箱完毕，无需操作',
-          background: Colors.green.shade50,
-          foreground: Colors.green.shade800,
-          border: Colors.green.shade100,
+          background: Colors.red.shade50,
+          foreground: Colors.red.shade800,
+          border: Colors.red.shade100,
         ),
       );
     }
@@ -1762,7 +1771,7 @@ class _BoxingPageState extends State<BoxingPage> with WidgetsBindingObserver {
                       overflow: TextOverflow.ellipsis,
                     ),
                     Text(
-                      '本次扫码',
+                      _workOrderNo ?? '--',
                       style: TextStyle(
                         fontSize: 10,
                         color: Colors.grey.shade500,

lib/services/feedback_service.dart

@@ -10,6 +10,7 @@ enum FeedbackEvent {
   duplicateError, // Duplicate (shelf)    → alert loop + continuous vibrate
   networkError, // Network error         → failure sound + short vibrate
   duplicateBoxNo, // Duplicate box no     → failure sound + short vibrate
+  alreadyCompleted, // Zongpai already boxed → beep + double vibrate
   modeSwitch, // Mode toggle           → beep only
   paichanSwitch, // Paichan changed      → beep + short vibrate
 }
@@ -55,6 +56,10 @@ class FeedbackService {
         _soundService.playFailure();
         _vibrateShort();
 
+      case FeedbackEvent.alreadyCompleted:
+        _soundService.playBeep();
+        _vibrateDouble();
+
       case FeedbackEvent.modeSwitch:
         _soundService.playBeep();
 
@@ -82,6 +87,11 @@ class FeedbackService {
     Vibration.vibrate(pattern: [0, 300, 100, 300, 100, 300]);
   }
 
+  /// Two short bursts to signal an already-completed item.
+  void _vibrateDouble() {
+    Vibration.vibrate(pattern: [0, 200, 100, 200]);
+  }
+
   Future<void> dispose() async {
     await _soundService.dispose();
   }