refactor(policy_widget): remove unused import for policy_provider to enhance clarity

Author: dgarciasquare1

lib/src/widgets/policy_widget.dart

@@ -1,6 +1,5 @@
 import 'package:flutter/widgets.dart';
 import 'package:flutter_policy_engine/flutter_policy_engine.dart';
-import 'package:flutter_policy_engine/src/core/policy_provider.dart';
 import 'package:flutter_policy_engine/src/exceptions/i_policy_sdk_exceptions.dart';
 
 /// A widget that conditionally displays its [child] based on policy access control.

test/widgets/policy_widget_test.dart

@@ -5,7 +5,6 @@ import 'package:flutter_policy_engine/src/core/policy_provider.dart';
 import 'package:flutter_policy_engine/src/core/policy_manager.dart';
 import 'package:flutter_policy_engine/src/core/interfaces/i_policy_evaluator.dart';
 import 'package:flutter_policy_engine/src/core/interfaces/i_policy_storage.dart';
-import 'package:flutter_policy_engine/src/exceptions/i_policy_sdk_exceptions.dart';
 import 'package:flutter_policy_engine/src/exceptions/policy_sdk_exception.dart';
 
 /// Mock implementation of IPolicyStorage for testing