Checkbox not working

[AnirudhG07]

I am trying to get a checkbox working in my setup, with a persistence(if u refresh, it should be there, basically put it on localStorage).
Can someone give me a demo on a checkbox, which on change, changes the boolean value of a variable based on its checked state? I am using JS.
I am using the CheckBox component for this, along with Label.

Shadcn-svelte version: latest, Svelte 5.0.0, npm version: 10.9.3

I am really unable to get this working i donno why. I tried the documentation, use runes, and AI too. nothing works.
This question might not be very informative, but it would be really helpful on how to get it to work.