fix(experience): date field should not report type error when fulfilling profile (#7676)

Author: charIeszhao

packages/experience/src/types/guard.ts

@@ -201,6 +201,7 @@ const dateFormatEnumGuard = s.enums(Object.values(SupportedDateFormat));
 
 export const dateFieldConfigGuard = s.object({
   format: dateFormatEnumGuard,
+  placeholder: s.optional(s.string()),
   customFormat: s.optional(s.string()),
 });