website refactor

apps/website/lib/builders/view-data/OnboardingViewDataBuilder.ts

@@ -0,0 +1,24 @@
+/**
+ * Onboarding ViewData Builder
+ *
+ * Transforms API DTOs into ViewData for onboarding page.
+ * Deterministic, side-effect free.
+ */
+
+import { Result } from '@/lib/contracts/Result';
+import { PresentationError } from '@/lib/contracts/page-queries/PresentationError';
+import { OnboardingPageViewData } from '@/lib/view-data/OnboardingPageViewData';
+
+export class OnboardingViewDataBuilder {
+  static build(apiDto: Result<{ isAlreadyOnboarded: boolean }, PresentationError>): Result<OnboardingPageViewData, PresentationError> {
+    if (apiDto.isErr()) {
+      return Result.err(apiDto.getError());
+    }
+
+    const data = apiDto.unwrap();
+    
+    return Result.ok({
+      isAlreadyOnboarded: data.isAlreadyOnboarded || false,
+    });
+  }
+}