website refactor

apps/website/lib/builders/view-models/OnboardingViewModelBuilder.ts

@@ -0,0 +1,23 @@
+/**
+ * Onboarding ViewModel Builder
+ *
+ * Transforms API DTOs into ViewModels for client-side state management.
+ * Deterministic, side-effect free.
+ */
+
+import { Result } from '@/lib/contracts/Result';
+import { DomainError } from '@/lib/contracts/services/Service';
+import { OnboardingViewModel } from '@/lib/view-models/OnboardingViewModel';
+
+export class OnboardingViewModelBuilder {
+  static build(apiDto: { isAlreadyOnboarded: boolean }): Result<OnboardingViewModel, DomainError> {
+    try {
+      return Result.ok({
+        isAlreadyOnboarded: apiDto.isAlreadyOnboarded || false,
+      });
+    } catch (error) {
+      const errorMessage = error instanceof Error ? error.message : 'Failed to build ViewModel';
+      return Result.err({ type: 'unknown', message: errorMessage });
+    }
+  }
+}