feat(customers): add dashboard and customer management

frontend/athena/components/common/SummaryCard.tsx

@@ -0,0 +1,13 @@
+type Props = {
+  label: string;
+  value: number | string;
+};
+
+export default function SummaryCard({ label, value }: Props) {
+  return (
+    <div className="rounded-lg border bg-white p-5">
+      <p className="text-sm text-slate-500">{label}</p>
+      <p className="mt-2 text-3xl font-semibold text-slate-950">{value}</p>
+    </div>
+  );
+}