add floating-ui based popover attachment

src/lib/index.ts

@@ -21,6 +21,7 @@ export {
 	iso8601ToDuration
 } from './DurationInput.svelte';
 export { default as ErrorBox } from './ErrorBox.svelte';
+export { type PopoverOptions, Popover } from './floating.svelte';
 export { default as FramelessButton } from './FramelessButton.svelte';
 export { default as InjectGoogleMaps } from './InjectGoogleMaps.svelte';
 export { default as InjectUmami } from './InjectUmami.svelte';