feat: refactor dashboard and account pages to utilize new layout components, enhancing structure and loading states

components/layout/loading-state.tsx

@@ -0,0 +1,16 @@
+"use client";
+
+import { Sidebar } from "@/components/dashboard/sidebar";
+import { RefreshCw } from "lucide-react";
+
+export function LoadingState() {
+  return (
+    <div className="flex h-screen">
+      <Sidebar />
+      <main className="flex-1 flex items-center justify-center">
+        <RefreshCw className="w-8 h-8 animate-spin text-muted-foreground" />
+      </main>
+    </div>
+  );
+}
+