feat: comprehensive CMS improvements

- Fix DOMPurify SSR crash (use isomorphic-dompurify)
- Fix SanitizedHtml to sanitize by default
- Add auth guards to studio/catalog maintenance pages
- Add update/edit to vouchers CRUD
- Add update/edit to rare-values CRUD
- Add approve workflow to applications page
- Add edit form to guilds detail page
- Add SEO metadata to all public pages (21 pages)
- Fix mobile nav accessibility (focus trap, aria attributes)
- Fix missing labels and table accessibility
- Add dynamic imports for heavy client components (6 components)
- Fix silent error swallowing (40+ locations)
- Add content scheduling for articles (publishAt, status)
- Wire up 12 missing webhook notification triggers
- Add global search to admin panel
- Add bulk actions to admin users table
- Fix JSON formatting and a11y issues

src/app/admin/catalog/maintenance/page.tsx

@@ -1,5 +1,12 @@
+import { redirect } from "next/navigation";
 import { CatalogMaintenancePanel } from "@/components/admin/catalog/catalog-maintenance-panel";
+import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
+
+export default async function CatalogMaintenancePage() {
+	const { session, permissions } = await getAdminContext();
+	if (!canAccess(permissions, PERMS.CATALOG_VIEW, session.user.rank)) {
+		redirect("/admin");
+	}
 
-export default function CatalogMaintenancePage() {
 	return <CatalogMaintenancePanel />;
 }