fix missing checkbox export

src/lib/Checkbox.svelte

@@ -15,7 +15,7 @@
 		color?: 'default' | 'contrast';
 		class?: ClassValue | null | undefined;
 		children?: Snippet;
-		onchange: (value: CheckboxState) => void;
+		onchange?: (value: CheckboxState) => void;
 	}
 
 	let {
@@ -66,7 +66,7 @@
 			} else {
 				value = false;
 			}
-			onchange(value);
+			onchange?.(value);
 		}}
 	>
 		{#if value === 'indeterminate'}

src/lib/index.ts

@@ -1,6 +1,7 @@
 // Reexport your entry components here
 export { default as Button } from './Button.svelte';
 export { default as CenterBox } from './CenterBox.svelte';
+export { default as Checkbox } from './Checkbox.svelte';
 export { default as Combobox } from './Combobox.svelte';
 export { default as FramelessButton } from './FramelessButton.svelte';
 export { default as InjectGoogleMaps } from './InjectGoogleMaps.svelte';