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/moderation/actions/mod-actions-client.tsx

@@ -104,6 +104,7 @@ export function ModActionsClient() {
 							value={userId}
 							onChange={(e) => setUserId(e.target.value)}
 							placeholder="Enter user ID"
+							aria-label="User ID"
 						/>
 					</div>
 
@@ -144,6 +145,7 @@ export function ModActionsClient() {
 							onChange={(e) => setMuteDuration(e.target.value)}
 							className="w-24"
 							placeholder="Min"
+							aria-label="Mute duration in minutes"
 						/>
 						<Button
 							variant="outline"
@@ -215,6 +217,7 @@ export function ModActionsClient() {
 								value={roomId}
 								onChange={(e) => setRoomId(e.target.value)}
 								placeholder="Enter room ID"
+								aria-label="Room ID"
 							/>
 						</div>
 						<Button