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/lib/sanitize.ts

@@ -1,8 +1,6 @@
-import DOMPurify from "dompurify";
-
-const sanitizeHtml = (html: string) => DOMPurify.sanitize(html);
+import DOMPurify from "isomorphic-dompurify";
 
 export function sanitize(html: string | null | undefined): string {
 	if (!html) return "";
-	return sanitizeHtml(html);
+	return DOMPurify.sanitize(html);
 }