fix(25-02): stop wheel event propagation to prevent React Flow capture

- React Flow captures wheel events for zoom/pan at document level
- stopPropagation prevents wheel events from reaching React Flow

src/components/quickstart/WelcomeModal.tsx

@@ -75,7 +75,10 @@ export function WelcomeModal({
   );
 
   return (
-    <div className="fixed inset-0 z-[100] flex items-center justify-center bg-black/50 backdrop-blur-sm">
+    <div
+      className="fixed inset-0 z-[100] flex items-center justify-center bg-black/50 backdrop-blur-sm"
+      onWheel={(e) => e.stopPropagation()}
+    >
       <div className="w-full max-w-4xl mx-4 bg-neutral-800 rounded-xl border border-neutral-700 shadow-2xl overflow-clip max-h-[80vh] flex flex-col">
         {currentView === "initial" && (
           <QuickstartInitialView