Fix type for Checkbox defaultChecked

Author: lukas-openai

.changeset/bright-apricots-learn.md

@@ -0,0 +1,5 @@
+---
+'@openai/chatkit': patch
+---
+
+Fix type for Checkbox `defaultChecked`

packages/chatkit/types/widgets.d.ts

@@ -333,7 +333,7 @@ export type Checkbox = {
   id?: string;
   name: string;
   label?: string;
-  defaultChecked?: string;
+  defaultChecked?: boolean;
   onChangeAction?: ActionConfig;
   disabled?: boolean;
   required?: boolean;