feat: sticky window title bar so progress bar stays visible on scroll

components/window.tsx

@@ -61,7 +61,7 @@ export default function Window({
     <div
       className={`rounded-lg border border-white/30 bg-white/70 shadow-window backdrop-blur-xl ${className}`}
     >
-      <div className="rounded-t-md overflow-hidden">
+      <div className="rounded-t-md overflow-hidden sticky top-0 z-10">
         <div className="flex select-none items-center justify-between bg-gradient-to-b from-blue-500 to-window-title px-4 py-1.5 font-bold text-white text-sm">
           <div className="flex items-center space-x-2">
             <span>{title}</span>