Add CSS for Torque lenses

This MR adds the CSS for Torque lens badges (ots/llm/meta#49), as well as example markup (in the CSS file) for composing them. (These elements aren't actually generated by the LLM yet, so… this is currently just theoretical.)

It doesn't add the tooltips for explaining them — that will come after higher-priority tasks. So don't close that linked issue.