fix(25-02): use onWheelCapture for capture phase

- React Flow may listen during capture phase
- onWheelCapture intercepts before bubbling phase

src/components/quickstart/WelcomeModal.tsx

@@ -77,7 +77,7 @@ export function WelcomeModal({
   return (
     <div
       className="fixed inset-0 z-[100] flex items-center justify-center bg-black/50 backdrop-blur-sm"
-      onWheel={(e) => e.stopPropagation()}
+      onWheelCapture={(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" && (