refactor(Container): simplify container component and remove size prop

Remove size variants from Container component and set a default max-width
Update all instances where Container was used with size prop to use default

src/components/GlassHeader.tsx

@@ -44,7 +44,7 @@ export default function GlassHeader({ lang: propLang }: GlassHeaderProps) {
         ? 'backdrop-blur-md backdrop-filter bg-white/80 dark:bg-black/80 border-b border-border/30 shadow-lg shadow-black/5 dark:shadow-black/20' 
         : 'bg-transparent'
     }`}>
-      <Container size="sm" className="p-4 flex justify-between items-center">
+      <Container className="p-4 flex justify-between items-center">
         <a
           className="flex items-center text-lg font-medium transition-opacity duration-150 hover:opacity-80"
           href={getLocalizedPath('/', lang)}