add auth, format

lib/core/providers/provider_examples.dart

@@ -34,7 +34,11 @@ String appVersion(Ref ref) {
 int pointsMultiplier(Ref ref) {
   // Can read other providers
   final userTier = 'diamond'; // This would come from another provider
-  return userTier == 'diamond' ? 3 : userTier == 'platinum' ? 2 : 1;
+  return userTier == 'diamond'
+      ? 3
+      : userTier == 'platinum'
+      ? 2
+      : 1;
 }
 
 // ============================================================================
@@ -46,7 +50,7 @@ int pointsMultiplier(Ref ref) {
 @riverpod
 Future<String> userData(Ref ref) async {
   // Simulate API call
-  await Future.delayed(const Duration(seconds: 1));
+  await Future<void>.delayed(const Duration(seconds: 1));
   return 'User Data';
 }
 
@@ -55,7 +59,7 @@ Future<String> userData(Ref ref) async {
 @riverpod
 Future<String> userProfile(Ref ref, String userId) async {
   // Simulate API call with userId
-  await Future.delayed(const Duration(seconds: 1));
+  await Future<void>.delayed(const Duration(seconds: 1));
   return 'Profile for user: $userId';
 }
 
@@ -70,7 +74,7 @@ Future<List<String>> productList(
   String? searchQuery,
 }) async {
   // Simulate API call with parameters
-  await Future.delayed(const Duration(milliseconds: 500));
+  await Future<void>.delayed(const Duration(milliseconds: 500));
   return ['Product 1', 'Product 2', 'Product 3'];
 }
 
@@ -82,10 +86,7 @@ Future<List<String>> productList(
 /// Use this for WebSocket connections, real-time updates, etc.
 @riverpod
 Stream<int> timer(Ref ref) {
-  return Stream.periodic(
-    const Duration(seconds: 1),
-    (count) => count,
-  );
+  return Stream.periodic(const Duration(seconds: 1), (count) => count);
 }
 
 /// Stream provider with parameters
@@ -176,7 +177,7 @@ class UserProfileNotifier extends _$UserProfileNotifier {
   @override
   Future<UserProfileData> build() async {
     // Fetch initial data
-    await Future.delayed(const Duration(seconds: 1));
+    await Future<void>.delayed(const Duration(seconds: 1));
     return UserProfileData(name: 'John Doe', email: 'john@example.com');
   }
 
@@ -225,10 +226,7 @@ class UserProfileData {
   final String email;
 
   UserProfileData copyWith({String? name, String? email}) {
-    return UserProfileData(
-      name: name ?? this.name,
-      email: email ?? this.email,
-    );
+    return UserProfileData(name: name ?? this.name, email: email ?? this.email);
   }
 }