checkbox-unchecked-24-filled

pnpm dlx shadcn@latest add https://opensourceicon.com/r/fluent/checkbox-unchecked-24-filled.json

<svg xmlns="http://www.w3.org/2000/svg" width="96" height="96" viewBox="0 0 24 24"><path fill="currentColor" d="M3 6.25A3.25 3.25 0 0 1 6.25 3h11.5A3.25 3.25 0 0 1 21 6.25v11.5A3.25 3.25 0 0 1 17.75 21H6.25A3.25 3.25 0 0 1 3 17.75zM6.25 5C5.56 5 5 5.56 5 6.25v11.5c0 .69.56 1.25 1.25 1.25h11.5c.69 0 1.25-.56 1.25-1.25V6.25C19 5.56 18.44 5 17.75 5z"/></svg>