- Remove csColorStrips CardSection from targets.js, add to streams.js
- Add color_strip sub-tab with tree nav entry between Picture and Audio
- Update navigateToCard refs in target cards and command palette
- Update tutorial steps: remove led-css from targets, add color_strip to sources
- Add i18n keys for streams.group.color_strip and tour.src.color_strip
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>