checkbox: no default value

src/lib/Checkbox.svelte

@@ -1,5 +1,5 @@
 <script lang="ts" module>
-	export type CheckboxState = 'indeterminate' | boolean | undefined;
+	export type CheckboxState = 'indeterminate' | boolean;
 </script>
 
 <script lang="ts">
@@ -22,7 +22,7 @@
 	let {
 		name,
 		required = false,
-		value = $bindable(false),
+		value = $bindable(),
 		color = 'contrast',
 		class: classValue,
 		children,
@@ -63,7 +63,7 @@
 			!valid && 'border-sui-accent-400 border'
 		]}
 		onclick={() => {
-			if (value === false || value === 'indeterminate') {
+			if (value === false || value === undefined || value === 'indeterminate') {
 				value = true;
 			} else {
 				value = false;