CI's `npm ci` failed because the previous lock was generated on macOS
arm64, which omits the Linux-specific optional deps that
@tailwindcss/postcss → lightningcss-linux-x64-gnu transitively need
(@emnapi/runtime, @emnapi/core).
Re-ran `npm install --include=optional` so the lock includes every
platform variant of lightningcss + the @emnapi packages they pull in.
Runner (Linux x64) now has what it needs; local macOS install still
fine (npm picks the matching binary at install time).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>