Add AI batch reconciliation for accessibility bills

frontend/test/theme_and_time_test.dart

@@ -91,6 +91,41 @@ void main() {
     expect(candidate.resultFingerprint, 'abc123');
   });
 
+  test('AI 批次模型保留动作、原因与可恢复状态', () {
+    final batch = RecognitionBatch.fromJson({
+      'id': 'batch-1',
+      'state': 'ready',
+      'openedAt': DateTime.utc(2026, 7, 25, 8).millisecondsSinceEpoch,
+      'completedAt': DateTime.utc(2026, 7, 25, 8, 1).millisecondsSinceEpoch,
+      'summary': {
+        'kept': 1,
+        'updated': 1,
+        'created': 0,
+        'dropped': 1,
+        'fallback': false,
+      },
+      'items': [
+        {
+          'candidateId': 'candidate-1',
+          'action': 'drop',
+          'reason': '同一流程重复结果页',
+          'state': 'ai_dropped',
+          'type': 'expense',
+          'amount': 20,
+          'merchant': '张三',
+          'canRestore': true,
+        },
+      ],
+    });
+
+    expect(batch.completedAt.isUtc, isTrue);
+    expect(batch.updated, 1);
+    expect(batch.dropped, 1);
+    expect(batch.items.single.action, 'drop');
+    expect(batch.items.single.reason, '同一流程重复结果页');
+    expect(batch.items.single.canRestore, isTrue);
+  });
+
   test('智能识别诊断摘要能区分关键失败类型', () {
     RecognitionDiagnostic diagnostic(String result, String reason) {
       return RecognitionDiagnostic(