- Replace gray->cool-steel, blue/indigo->cerulean, red->sweet-salmon, yellow/amber->wheat
- Dark sidebar: sidebar/footer use cool-steel-800 bg, text lightened for contrast
- ~11,600 color replacements across ~99 files
- Update tests for new color class names
Converts the 120KB PNG logo to 17KB WebP (86% smaller). Both logo instances in the marketing layout use <picture> with WebP source and PNG fallback for maximum browser compatibility.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
Add dark: variants throughout the marketing page and layout so text,
backgrounds, cards, badges, and borders render properly when the
system or user preference is set to dark mode. Use invert + screen
blend mode on the logo PNG to eliminate its white background.