feat: Implement responsive design for the experiment designer and enhance general UI components with hover effects and shadows.

src/app/(dashboard)/studies/[id]/experiments/[experimentId]/designer/DesignerPageClient.tsx

@@ -56,6 +56,8 @@ export function DesignerPageClient({
   ]);
 
   return (
-    <DesignerRoot experimentId={experiment.id} initialDesign={initialDesign} />
+    <div className="h-[calc(100vh-4rem-2rem)] w-full overflow-hidden border rounded-lg bg-background">
+      <DesignerRoot experimentId={experiment.id} initialDesign={initialDesign} />
+    </div>
   );
 }