Add user management features.

frontend/src/components/button.tsx

@@ -0,0 +1,14 @@
+import { ReactNode } from "react";
+
+export default function Button({ children, onClick, className, disabled, isLoading }: { children: ReactNode, onClick?: () => void, className?: string, disabled?: boolean, isLoading?: boolean }) {
+  return <button
+    className={`btn ${className} ${disabled ? "btn-disabled" : ""} h-9`}
+    onClick={onClick}
+    disabled={disabled}
+  >
+    {isLoading && <span className="loading loading-spinner loading-sm mr-2"></span>}
+    <span className="text-sm">
+        {children}
+    </span>
+  </button>;
+}