Add dark mode support (light / dark / system) to an existing Next.js + Tailwind v4 project using next-themes. Configures the dark variant in globals.css, audits existing colors and proposes dark-mode tokens, mounts ThemeProvider in the root layout (and in the [locale] layout if i18n is detected), and creates a 3-state ThemeToggle component ready to drop in the header / navbar / footer.
$npx -y skills add flavien-ia/hypervibe-harness --skill add-dark-modeInstalls into the current project.
Run `npx skills use "https://github.com/flavien-ia/hypervibe-harness" --skill "flavien-ia/hypervibe-harness/add-dark-mode"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.
Use the skills in "https://github.com/flavien-ia/hypervibe-harness" that are relevant to the current task. Run `npx skills add "https://github.com/flavien-ia/hypervibe-harness"` and select the relevant skills, then follow their instructions.