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/(dashboard)/layout.tsx

@@ -0,0 +1,6 @@
+import type { ReactNode } from 'react';
+import { AppShell } from '@/components/layout/app-shell';
+
+export default function DashboardLayout({ children }: { children: ReactNode }): React.ReactElement {
+  return <AppShell>{children}</AppShell>;
+}