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

package.json

@@ -45,6 +45,7 @@
 		"drizzle-orm": "0.45.2",
 		"hash-wasm": "4.12.0",
 		"ioredis": "6.0.0",
+		"isomorphic-dompurify": "^4.1.0",
 		"jpeg-js": "0.4.4",
 		"jsonc-parser": "3.3.1",
 		"jszip": "3.10.1",
@@ -74,6 +75,7 @@
 		"@tailwindcss/forms": "0.5.11",
 		"@tailwindcss/postcss": "4.3.3",
 		"@tailwindcss/typography": "0.5.20",
+		"@types/dompurify": "^3.2.0",
 		"@types/node": "26.4.0",
 		"@types/react": "19.2.18",
 		"@types/react-dom": "19.2.5",