feat(site): implement dynamic client OS negotiation for Hero and CTA download buttons

site/src/components/GlowButton.tsx

@@ -3,6 +3,7 @@ import type { ReactNode } from 'react'
 interface GlowButtonProps {
   children: ReactNode
   href?: string
+  download?: string
   variant?: 'primary' | 'secondary'
   size?: 'md' | 'lg'
   className?: string
@@ -11,6 +12,7 @@ interface GlowButtonProps {
 export function GlowButton({
   children,
   href,
+  download,
   variant = 'primary',
   size = 'md',
   className = '',
@@ -31,7 +33,7 @@ export function GlowButton({
 
   if (href) {
     return (
-      <a href={href} className={cls}>
+      <a href={href} download={download} className={cls}>
         <span className="relative z-10">{children}</span>
       </a>
     )
@@ -43,3 +45,4 @@ export function GlowButton({
     </button>
   )
 }
+