feat: support box-number navigation for completed multi-code boxing & unify key handling

- In multi-code boxing mode, scanning a completed total-row number shows a
  clickable warning banner; clicking it or pressing P4 navigates to that
  box number to view boxing details.
- Unify key handling across all pages to LogicalKeyboardKey named constants,
  removing the _androidKeyCodeFromLogicalKey fallback path.

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

lib/pages/boxing_page.dart

@@ -84,9 +84,6 @@ class BoxingPage extends StatefulWidget {
 }
 
 class _BoxingPageState extends State<BoxingPage> with WidgetsBindingObserver {
-  static const _androidKeyCodeButtonR1 = 103;
-  static const _androidKeyCodeButtonL2 = 104;
-
   final _scannerService = ScannerService();
   final _apiService = ApiService();
   final _feedbackService = FeedbackService();
@@ -145,6 +142,9 @@ class _BoxingPageState extends State<BoxingPage> with WidgetsBindingObserver {
   bool _isAutoProcessing = false;
   final _autoWarnings = <String>[];
 
+  // 多码凑箱：已完成装箱时可跳转的箱号
+  int? _completedJumpBoxNo;
+
   @override
   void initState() {
     super.initState();
@@ -201,28 +201,23 @@ class _BoxingPageState extends State<BoxingPage> with WidgetsBindingObserver {
         _finishManyToOneBox();
       }
     }
+    if (_completedJumpBoxNo != null && _isJumpToBoxKey(event)) {
+      _jumpToCompletedBox();
+    }
   }
 
   bool _isModeSwitchKey(KeyEvent event) {
     final key = event.logicalKey;
     return key == LogicalKeyboardKey.select ||
-        key == LogicalKeyboardKey.gameButtonRight1 ||
-        _androidKeyCodeFromLogicalKey(key) == _androidKeyCodeButtonR1;
+        key == LogicalKeyboardKey.gameButtonRight1;
   }
 
   bool _isFinishBoxKey(KeyEvent event) {
-    final key = event.logicalKey;
-    return key == LogicalKeyboardKey.gameButtonLeft2 ||
-        _androidKeyCodeFromLogicalKey(key) == _androidKeyCodeButtonL2;
+    return event.logicalKey == LogicalKeyboardKey.gameButtonLeft2;
   }
 
-  int? _androidKeyCodeFromLogicalKey(LogicalKeyboardKey key) {
-    final keyId = key.keyId;
-    const androidPlane = LogicalKeyboardKey.androidPlane;
-    if (keyId >= androidPlane && keyId < androidPlane + 0x100000000) {
-      return keyId - androidPlane;
-    }
-    return null;
+  bool _isJumpToBoxKey(KeyEvent event) {
+    return event.logicalKey == LogicalKeyboardKey.gameButtonRight2;
   }
 
   void _onBoxNoTextChanged() {
@@ -372,6 +367,7 @@ class _BoxingPageState extends State<BoxingPage> with WidgetsBindingObserver {
       _editingAssignedItemId = null;
       _editingAssignedQuantity = '';
       _deletingAssignedItemId = null;
+      _completedJumpBoxNo = null;
       _statusOverrideText = null;
       if (_mode == BoxingMode.singleCode) {
         _paichanSwitchNotice = null;
@@ -482,6 +478,10 @@ class _BoxingPageState extends State<BoxingPage> with WidgetsBindingObserver {
         final remaining = _remainingQuantity;
         if (remaining <= 0) {
           _quantityController.clear();
+          if (_manyToOnePackedItems.isEmpty &&
+              _currentZongpaiBoxes.isNotEmpty) {
+            _completedJumpBoxNo = _currentZongpaiBoxes.first.boxNo;
+          }
           _statusOverrideText = '该总排号已全部装箱完毕';
           _statusOverrideDot = StatusDotColor.red;
           return;
@@ -1230,6 +1230,17 @@ class _BoxingPageState extends State<BoxingPage> with WidgetsBindingObserver {
     });
   }
 
+  void _jumpToCompletedBox() {
+    final boxNo = _completedJumpBoxNo;
+    if (boxNo == null) return;
+    setState(() {
+      _boxNoController.text = boxNo.toString();
+      _completedJumpBoxNo = null;
+      _statusOverrideText = null;
+      _statusOverrideDot = null;
+    });
+  }
+
   // === 导航到详情页 ===
 
   void _openDetail() {
@@ -1430,15 +1441,32 @@ class _BoxingPageState extends State<BoxingPage> with WidgetsBindingObserver {
     if (_phase == _Phase.scanned &&
         _zongpaiNo != null &&
         _remainingQuantity <= 0) {
-      banners.add(
-        _noticeBanner(
-          icon: Icon(Icons.warning, size: 14, color: Colors.red.shade800),
-          text: '${_zongpaiNo!} 已全部装箱完毕，无需操作',
-          background: Colors.red.shade50,
-          foreground: Colors.red.shade800,
-          border: Colors.red.shade100,
-        ),
-      );
+      final jumpBoxNo = _completedJumpBoxNo;
+      if (jumpBoxNo != null) {
+        banners.add(
+          GestureDetector(
+            onTap: _jumpToCompletedBox,
+            behavior: HitTestBehavior.opaque,
+            child: _noticeBanner(
+              icon: Icon(Icons.warning, size: 14, color: Colors.amber.shade800),
+              text: '${_zongpaiNo!} 已完成装箱。(P4跳转所在箱号)',
+              background: Colors.amber.shade50,
+              foreground: Colors.amber.shade800,
+              border: Colors.amber.shade200,
+            ),
+          ),
+        );
+      } else {
+        banners.add(
+          _noticeBanner(
+            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.red.shade50,
+            foreground: Colors.red.shade800,
+            border: Colors.red.shade100,
+          ),
+        );
+      }
     }
     return banners;
   }