feat: add design system

src/routes/earnings/-/EarningsRoute.tsx

@@ -0,0 +1,5 @@
+import SectionSurface from "@components/surface/SectionSurface";
+
+export default function EarningsRoute() {
+  return <SectionSurface>Hello "/earnings"!</SectionSurface>;
+}

src/routes/earnings/index.tsx

@@ -0,0 +1,3 @@
+import { createFileRoute } from "@tanstack/react-router";
+import component from "./-/EarningsRoute";
+export const Route = createFileRoute("/earnings/")({ component });