Unify workspace dropdowns; Update layouts (#458)

Unified Account and Workspace drop-downs; Layout updates, now header lives within the PageBody component; Sidebars now use floating variant

packages/features/admin/src/lib/server/utils/admin-action-client.ts

@@ -0,0 +1,23 @@
+import 'server-only';
+
+import { notFound } from 'next/navigation';
+
+import { authActionClient } from '@kit/next/safe-action';
+import { getSupabaseServerClient } from '@kit/supabase/server-client';
+
+import { isSuperAdmin } from './is-super-admin';
+
+/**
+ * @name adminActionClient
+ * @description Safe action client for admin-only actions.
+ * Extends authActionClient with super admin verification.
+ */
+export const adminActionClient = authActionClient.use(async ({ next, ctx }) => {
+  const isAdmin = await isSuperAdmin(getSupabaseServerClient());
+
+  if (!isAdmin) {
+    notFound();
+  }
+
+  return next({ ctx });
+});