https://lit.dev/playground/#sample=examples/motion-todos

seems to be missing/looking for the wrong versions of node_modules/@Material components

it's looking for 0.25.1
https://github.com/lit/lit.dev/blob/main/packages/lit-dev-content/samples/examples/motion-todos/project.json

but maybe 0.27.0 is installed
https://github.com/lit/lit.dev/blob/main/packages/lit-dev-content/package.json