feat(App): update Finlytic Flutter app UI and blocs

FinlyticApp/lib/core/services/secure_storage_service.dart

@@ -0,0 +1,37 @@
+import 'package:flutter_secure_storage/flutter_secure_storage.dart';
+
+/// Secure token and session storage service.
+class SecureStorageService {
+  final _storage = const FlutterSecureStorage();
+
+  static const String _keyToken = 'jwt_token';
+  static const String _keyUserEmail = 'user_email';
+
+  Future<void> saveToken(String token) async {
+    await _storage.write(key: _keyToken, value: token);
+  }
+
+  Future<String?> getToken() async {
+    return await _storage.read(key: _keyToken);
+  }
+
+  Future<void> saveUserEmail(String email) async {
+    await _storage.write(key: _keyUserEmail, value: email);
+  }
+
+  Future<String?> getUserEmail() async {
+    return await _storage.read(key: _keyUserEmail);
+  }
+
+  Future<void> deleteToken() async {
+    await _storage.delete(key: _keyToken);
+  }
+
+  Future<void> deleteUserEmail() async {
+    await _storage.delete(key: _keyUserEmail);
+  }
+
+  Future<void> clearAll() async {
+    await _storage.deleteAll();
+  }
+}