design: add I'm not sure skip button to product archetype onboarding page

vibn-frontend/_onboarding/onboarding-entrepreneur.tsx

@@ -370,6 +370,10 @@ export function EntrepreneurPath({
       />
     );
     canNext = !!data.productType;
+    onSkip = () => {
+      onUpdate({ productType: "not_sure" });
+      next();
+    };
   } else if (step === 1) {
     body = (
       <EntrepIdea
@@ -413,7 +417,7 @@ export function EntrepreneurPath({
           nextLabel={step === ENTREP_TOTAL - 1 ? "Build →" : "Continue"}
           hint={canNext ? "⌘↵" : null}
           onSkip={onSkip}
-          skipLabel="Pick for me"
+          skipLabel={step === 0 ? "I'm not sure" : "Pick for me"}
         />
       </WizardBody>
     </>