checkbox-indeterminate-16-filled

pnpm dlx shadcn@latest add https://opensourceicon.com/r/fluent/checkbox-indeterminate-16-filled.json

<svg xmlns="http://www.w3.org/2000/svg" width="96" height="96" viewBox="0 0 16 16"><path fill="currentColor" d="M4.5 2A2.5 2.5 0 0 0 2 4.5v7A2.5 2.5 0 0 0 4.5 14h7a2.5 2.5 0 0 0 2.5-2.5v-7A2.5 2.5 0 0 0 11.5 2zm-1 2.5a1 1 0 0 1 1-1h7a1 1 0 0 1 1 1v7a1 1 0 0 1-1 1h-7a1 1 0 0 1-1-1zm2 .5a.5.5 0 0 0-.5.5v5a.5.5 0 0 0 .5.5h5a.5.5 0 0 0 .5-.5v-5a.5.5 0 0 0-.5-.5z"/></svg>