fix: resolve flutter analyze warnings - unused imports, unnecessary casts

lib/features/clients/presentation/clients_screen.dart

@@ -2,7 +2,6 @@ import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 import '../../../shared/services/api_client.dart';
-import '../../../shared/providers/auth_provider.dart';
 
 final clientsProvider = FutureProvider.autoDispose
     .family<List<Map<String, dynamic>>, String?>((ref, search) async {

lib/features/emails/presentation/emails_screen.dart

@@ -1,6 +1,5 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
-import 'package:go_router/go_router.dart';
 import 'package:intl/intl.dart';
 import '../../../shared/services/api_client.dart';
 

test/features/auth/login_screen_test.dart

@@ -3,7 +3,6 @@ import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:network_app/features/auth/presentation/login_screen.dart';
-import 'package:network_app/shared/providers/auth_provider.dart';
 import 'package:network_app/shared/services/api_client.dart';
 import 'package:mocktail/mocktail.dart';
 

test/features/clients/clients_screen_test.dart

@@ -3,7 +3,6 @@ import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:network_app/features/clients/presentation/clients_screen.dart';
-import 'package:network_app/shared/providers/auth_provider.dart';
 import 'package:network_app/shared/services/api_client.dart';
 import 'package:mocktail/mocktail.dart';
 

test/features/clients/clients_test.dart

@@ -1,4 +1,3 @@
-import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 
 void main() {
@@ -53,7 +52,7 @@ void main() {
         'company': null,
       };
       
-      final company = client['company'] as String?;
+      final company = client['company'];
       expect(company, isNull);
     });
 
@@ -64,7 +63,7 @@ void main() {
         'company': '',
       };
       
-      final company = client['company'] as String?;
+      final company = client['company'];
       final hasCompany = company != null && company.isNotEmpty;
       expect(hasCompany, isFalse);
     });

test/shared/providers/auth_provider_test.dart

@@ -1,4 +1,3 @@
-import 'dart:async';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:network_app/shared/providers/auth_provider.dart';
@@ -63,7 +62,7 @@ void main() {
     test('initial state checks session', () async {
       when(() => mockApiClient.getSession()).thenAnswer((_) async => null);
 
-      final notifier = container.read(authStateProvider.notifier);
+      final _ = container.read(authStateProvider.notifier);
       
       // Wait for async initialization
       await Future.delayed(Duration.zero);
@@ -101,7 +100,7 @@ void main() {
         'user': {'id': '1', 'email': 'test@test.com'},
       });
 
-      final notifier = container.read(authStateProvider.notifier);
+      final _ = container.read(authStateProvider.notifier);
       
       await Future.delayed(Duration.zero);
       
@@ -126,7 +125,7 @@ void main() {
         'user': {'id': '1', 'email': 'test@test.com', 'name': 'Test User'},
       });
 
-      final notifier = container.read(authStateProvider.notifier);
+      final _ = container.read(authStateProvider.notifier);
       
       await Future.delayed(Duration.zero);
       
@@ -149,7 +148,7 @@ void main() {
       });
       when(() => mockApiClient.signOut()).thenAnswer((_) async {});
 
-      final notifier = container.read(authStateProvider.notifier);
+      final _ = container.read(authStateProvider.notifier);
       
       await Future.delayed(const Duration(milliseconds: 100));
       
@@ -169,7 +168,7 @@ void main() {
         password: any(named: 'password'),
       )).thenThrow(Exception('Invalid credentials'));
 
-      final notifier = container.read(authStateProvider.notifier);
+      final _ = container.read(authStateProvider.notifier);
       
       await Future.delayed(Duration.zero);
 

test/shared/services/api_client_test.dart

@@ -1,6 +1,4 @@
 import 'package:flutter_test/flutter_test.dart';
-import 'package:dio/dio.dart';
-import 'package:mocktail/mocktail.dart';
 
 // Unit tests for API client logic (without actual HTTP calls)
 void main() {
@@ -100,7 +98,7 @@ void main() {
     test('query parameters include values when set', () {
       final params = <String, dynamic>{};
       
-      const search = 'John';
+      const String? search = 'John';
       const String? tag = null;
       
       if (search != null) params['search'] = search;