fix: resolve flutter analyze errors - remove leaked code, fix method calls, cleanup imports

lib/core/models/user_model.dart

@@ -0,0 +1,36 @@
+import 'package:equatable/equatable.dart';
+
+class UserModel extends Equatable {
+  const UserModel({
+    required this.id,
+    required this.email,
+    this.name,
+    this.image,
+    this.role = 'USER',
+  });
+
+  final String id;
+  final String email;
+  final String? name;
+  final String? image;
+  final String role;
+
+  factory UserModel.fromJson(Map<String, dynamic> json) => UserModel(
+        id: json['id'] as String,
+        email: json['email'] as String,
+        name: json['name'] as String?,
+        image: json['image'] as String?,
+        role: json['role'] as String? ?? 'USER',
+      );
+
+  Map<String, dynamic> toJson() => {
+        'id': id,
+        'email': email,
+        'name': name,
+        'image': image,
+        'role': role,
+      };
+
+  @override
+  List<Object?> get props => [id, email];
+}