Added core data models, repositories, and utilities

lifetimer/lib/core/errors/error_mapper.dart

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+import 'package:supabase_flutter/supabase_flutter.dart';
+import 'failure.dart';
+
+class ErrorMapper {
+  static Failure mapError(dynamic error) {
+    if (error is AuthException) {
+      switch (error.message) {
+        case 'Invalid login credentials':
+          return const AuthFailure('Invalid email or password');
+        case 'Email not confirmed':
+          return const AuthFailure('Please confirm your email address');
+        case 'User already registered':
+          return const AuthFailure('An account with this email already exists');
+        case 'Password should be at least 6 characters':
+          return const AuthFailure('Password must be at least 6 characters');
+        default:
+          return AuthFailure(error.message);
+      }
+    }
+
+    if (error is PostgrestException) {
+      switch (error.code) {
+        case '23505':
+          return const ValidationFailure('This record already exists');
+        case '23503':
+          return const ValidationFailure('Referenced record does not exist');
+        case '42501':
+          return const PermissionFailure('You do not have permission to perform this action');
+        default:
+          return ServerFailure(
+            error.message,
+            statusCode: int.tryParse(error.code ?? ''),
+          );
+      }
+    }
+
+    if (error is Exception) {
+      return NetworkFailure(error.toString().replaceAll('Exception: ', ''));
+    }
+
+    return UnknownFailure(error.toString());
+  }
+
+  static String getUserMessage(Failure failure) {
+    return failure.message;
+  }
+}

lifetimer/lib/core/errors/failure.dart

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+abstract class Failure {
+  final String message;
+  final int? statusCode;
+
+  const Failure(this.message, {this.statusCode});
+
+  @override
+  String toString() => 'Failure: $message';
+}
+
+class ServerFailure extends Failure {
+  const ServerFailure(super.message, {super.statusCode});
+}
+
+class NetworkFailure extends Failure {
+  const NetworkFailure(super.message);
+}
+
+class AuthFailure extends Failure {
+  const AuthFailure(super.message);
+}
+
+class ValidationFailure extends Failure {
+  const ValidationFailure(super.message);
+}
+
+class NotFoundFailure extends Failure {
+  const NotFoundFailure(super.message);
+}
+
+class PermissionFailure extends Failure {
+  const PermissionFailure(super.message);
+}
+
+class UnknownFailure extends Failure {
+  const UnknownFailure(super.message);
+}