Shadcn Guideline: DropdownMenu — Group menu items. Description: Use DropdownMenuGroup and DropdownMenuSeparator. Do: Organized menu with separators. Don't: Flat list of items. Good Example: <DropdownMenuGroup><DropdownMenuItem><DropdownMenuSeparator>. Bad Example: <DropdownMenuItem> without organization. Severity: Low. Docs: https://ui.shadcn.com/docs/components/dropdown-menu.