feat(web): scaffold Next.js 16 dashboard with design system and auth client (#82)

Co-authored-by: Jason Woltje <[email protected]>
Co-committed-by: Jason Woltje <[email protected]>

apps/web/src/app/(auth)/layout.tsx

@@ -0,0 +1,11 @@
+import type { ReactNode } from 'react';
+
+export default function AuthLayout({ children }: { children: ReactNode }): React.ReactElement {
+  return (
+    <div className="flex min-h-screen items-center justify-center bg-surface-bg">
+      <div className="w-full max-w-md rounded-xl border border-surface-border bg-surface-card p-8 shadow-lg">
+        {children}
+      </div>
+    </div>
+  );
+}