feat(shadcn): add new shadcn components

src/shared/shadcn/ui/collapsible/index.ts

@@ -0,0 +1,13 @@
+import Content from './collapsible-content.svelte';
+import Trigger from './collapsible-trigger.svelte';
+import Root from './collapsible.svelte';
+
+export {
+    Content,
+    Content as CollapsibleContent,
+    Root,
+    //
+    Root as Collapsible,
+    Trigger,
+    Trigger as CollapsibleTrigger,
+};