checkbox-indeterminate-24-filled

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

<svg xmlns="http://www.w3.org/2000/svg" width="96" height="96" viewBox="0 0 24 24"><path fill="currentColor" d="M6.25 3A3.25 3.25 0 0 0 3 6.25v11.5A3.25 3.25 0 0 0 6.25 21h11.5A3.25 3.25 0 0 0 21 17.75V6.25A3.25 3.25 0 0 0 17.75 3zM5 6.25C5 5.56 5.56 5 6.25 5h11.5c.69 0 1.25.56 1.25 1.25v11.5c0 .69-.56 1.25-1.25 1.25H6.25C5.56 19 5 18.44 5 17.75zm2.5.25a1 1 0 0 0-1 1v9a1 1 0 0 0 1 1h9a1 1 0 0 0 1-1v-9a1 1 0 0 0-1-1z"/></svg>