feat(ui): wire deferred Card tone and elevation variants

src/lib/components/ModelDownloader.svelte

@@ -62,7 +62,7 @@
 </script>
 
 <div class="flex flex-col items-center justify-center h-full px-8 animate-fade-in">
-  <Card classes="max-w-md w-full">
+  <Card classes="max-w-md w-full" elevation="raised">
     <div class="p-8 text-center">
       <div class="w-16 h-16 rounded-full bg-accent/10 flex items-center justify-center mx-auto mb-5">
         <svg class="w-8 h-8 text-accent" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5">