Add Baron Safe app features through session block skeleton

app/test/features/bridge/baron_safe_bridge_service_test.dart

@@ -1,6 +1,8 @@
 import 'package:baron_safe_app/src/features/bridge/baron_safe_bridge_command.dart';
 import 'package:baron_safe_app/src/features/bridge/baron_safe_bridge_models.dart';
 import 'package:baron_safe_app/src/features/bridge/baron_safe_bridge_service.dart';
+import 'package:baron_safe_app/src/features/session/baron_safe_session_block_service.dart';
+import 'package:baron_safe_app/src/features/session/baron_safe_session_models.dart';
 import 'package:flutter_test/flutter_test.dart';
 
 void main() {
@@ -77,5 +79,55 @@ void main() {
       expect(response.isSuccess, isFalse);
       expect(response.error?.code, 'not_implemented');
     });
+
+    test('rejects blockSession when sessionId is missing', () async {
+      const service = PlaceholderBaronSafeBridgeService(
+        sessionBlockService: _FakeSessionBlockService(),
+      );
+
+      final response = await service.handle(
+        const BaronSafeBridgeRequest(
+          command: BaronSafeBridgeCommand.blockSession,
+        ),
+      );
+
+      expect(response.isSuccess, isFalse);
+      expect(response.error?.code, 'invalid_payload');
+    });
+
+    test('runs injected session block service', () async {
+      const service = PlaceholderBaronSafeBridgeService(
+        sessionBlockService: _FakeSessionBlockService(),
+      );
+
+      final response = await service.handle(
+        const BaronSafeBridgeRequest(
+          command: BaronSafeBridgeCommand.blockSession,
+          payload: {'sessionId': 'session-1', 'reason': 'Suspicious login'},
+        ),
+      );
+
+      expect(response.isSuccess, isTrue);
+      expect(response.data['sessionId'], 'session-1');
+      expect(response.data['blocked'], isTrue);
+      expect(response.data['biometricVerified'], isTrue);
+    });
   });
 }
+
+class _FakeSessionBlockService implements BaronSafeSessionBlockService {
+  const _FakeSessionBlockService();
+
+  @override
+  Future<BaronSafeSessionBlockResult> blockSession({
+    required String sessionId,
+    required String reason,
+  }) async {
+    return BaronSafeSessionBlockResult(
+      sessionId: sessionId,
+      blocked: true,
+      biometricVerified: true,
+      message: reason,
+    );
+  }
+}