fix(25-02): change overflow-hidden to overflow-clip for wheel events

- overflow-hidden creates a scroll container that captures wheel events
- overflow-clip just clips visually without capturing events
- Applied to both modal container and content wrapper

src/components/quickstart/TemplateExplorerView.tsx

@@ -272,7 +272,7 @@ export function TemplateExplorerView({
       </div>
 
       {/* Content - Sidebar + Main Grid */}
-      <div className="flex-1 flex min-h-0 overflow-hidden">
+      <div className="flex-1 flex min-h-0 overflow-clip">
         {/* Sidebar */}
         <div className="w-48 flex-shrink-0 bg-neutral-900/80 border-r border-neutral-700 p-4 space-y-5 overflow-y-auto">
           {/* Search Input */}

src/components/quickstart/WelcomeModal.tsx

@@ -76,7 +76,7 @@ export function WelcomeModal({
 
   return (
     <div className="fixed inset-0 z-[100] flex items-center justify-center bg-black/50 backdrop-blur-sm">
-      <div className="w-full max-w-4xl mx-4 bg-neutral-800 rounded-xl border border-neutral-700 shadow-2xl overflow-hidden max-h-[80vh] flex flex-col">
+      <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
             onSelectBlankCanvas={handleSelectBlankCanvas}