feat: refine AI navigation and accessibility recovery

frontend/test/api_models_test.dart

@@ -5,6 +5,7 @@ import 'package:miaoji_zhang/shared/api/backend_identity.dart';
 import 'package:miaoji_zhang/shared/api/business_api.dart';
 import 'package:miaoji_zhang/shared/api/sse_frame_accumulator.dart';
 import 'package:miaoji_zhang/shared/services/current_ledger_store.dart';
+import 'package:miaoji_zhang/shared/services/screenshot_channel.dart';
 import 'package:miaoji_zhang/shared/widgets/app_icons.dart';
 
 void main() {
@@ -176,6 +177,38 @@ void main() {
     expect(report.balance, 2400);
   });
 
+  test('无障碍连接状态区分重连、正常和异常', () {
+    final reconnecting = RecognitionStatus.fromMap({
+      'accessibilityAuthorized': true,
+      'accessibilityConnected': false,
+      'accessibilityConnectionState': 'reconnecting',
+      'accessibilityLastConnectedAt': 1724472000000,
+      'settings': jsonEncode({'accessibilityEvents': true}),
+    });
+    final connected = RecognitionStatus.fromMap({
+      'accessibilityAuthorized': true,
+      'accessibilityConnected': true,
+      'accessibilityConnectionState': 'connected',
+      'settings': '{}',
+    });
+    final disconnected = RecognitionStatus.fromMap({
+      'accessibilityAuthorized': true,
+      'accessibilityConnected': false,
+      'accessibilityConnectionState': 'disconnected',
+      'settings': '{}',
+    });
+
+    expect(
+      reconnecting.accessibilityConnectionState,
+      AccessibilityConnectionState.reconnecting,
+    );
+    expect(reconnecting.accessibilityConnectionLabel, '正在重连');
+    expect(reconnecting.accessibilityLastConnectedAt, isNotNull);
+    expect(connected.accessibilityConnectionLabel, '已连接');
+    expect(disconnected.accessibilityConnectionLabel, '服务未连接');
+    expect(disconnected.accessibilityNeedsRecovery, isTrue);
+  });
+
   test('分类图标目录至少 32 个且键值不重复', () {
     final keys = AppIcons.categoryCatalog.map((item) => item.key).toList();
     expect(keys.length, greaterThanOrEqualTo(32));