update agents skill design

src/components/ds/index.js

@@ -80,6 +80,14 @@ export {
   DropdownMenuTrigger,
 } from '@/components/ui/dropdown-menu';
 export { Popover, PopoverContent, PopoverTrigger } from '@/components/ui/popover';
+/* Radix Collapsible, already present and previously unexported. The agent
+   configuration screen is a stack of long sections, and a page that opened all
+   of them at once would bury the one being edited. */
+export {
+  Collapsible,
+  CollapsibleContent,
+  CollapsibleTrigger,
+} from '@/components/ui/collapsible';
 export { Tooltip, TooltipContent, TooltipProvider, TooltipTrigger } from '@/components/ui/tooltip';
 export { HoverCard, HoverCardContent, HoverCardTrigger } from '@/components/ui/hover-card';