design: make I'm not sure a first-class full-width card tile inside the product-type selection grid

vibn-frontend/_onboarding/onboarding-entrepreneur.tsx

@@ -141,6 +141,12 @@ const ARCHETYPES = [
     label: "Blog / Publication",
     desc: "Newsletters, articles, content hubs",
   },
+  {
+    id: "not_sure",
+    label: "I'm not sure",
+    desc: "Let Vibn help you decide based on your description",
+    fullWidth: true,
+  },
 ];
 
 function EntrepType({ value, onChange }) {
@@ -156,6 +162,7 @@ function EntrepType({ value, onChange }) {
           label: a.label,
           desc: a.desc,
           icon: undefined,
+          fullWidth: a.fullWidth,
         }))}
         value={value}
         onChange={onChange}
@@ -370,10 +377,6 @@ export function EntrepreneurPath({
       />
     );
     canNext = !!data.productType;
-    onSkip = () => {
-      onUpdate({ productType: "not_sure" });
-      next();
-    };
   } else if (step === 1) {
     body = (
       <EntrepIdea

vibn-frontend/_onboarding/onboarding-primitives.tsx

@@ -344,6 +344,7 @@ export function PresetGroup({
     label?: React.ReactNode;
     desc?: React.ReactNode;
     icon?: React.ReactNode;
+    fullWidth?: boolean;
   }>;
   value?: string;
   onChange?: (id: string) => void;
@@ -381,6 +382,7 @@ export function PresetGroup({
               display: "flex",
               alignItems: "flex-start",
               gap: 12,
+              gridColumn: opt.fullWidth ? "1 / -1" : "auto",
             }}
           >
             {opt.icon && (