fix: export NeDropdownItem type

Author: andre8244

src/main.ts

@@ -43,6 +43,7 @@ export type { NePaginatorProps } from '@/components/NePaginator.vue'
 export type { Tab } from '@/components/NeTabs.vue'
 export type { NeNotification } from '@/components/NeToastNotification.vue'
 export type { NeListboxOption } from '@/components/NeListbox.vue'
+export type { NeDropdownItem } from '@/components/NeDropdown.vue'
 
 // library functions export
 export {