feat: expand utility widgets (#6638)

packages/widgets/src/_inputs/widget-select-input.tsx

@@ -72,6 +72,7 @@ export const WidgetSelectInput = ({ property, kind, options }: CommonWidgetInput
         );
       }}
       description={options.withDescription ? tWidget("description") : undefined}
+      placeholder={options.withPlaceholder ? tWidget("placeholder") : undefined}
       searchable={options.searchable}
       {...inputProps}
     />