next.js

02410851 - test: enable PostCSS multi-config test in Turbopack production mode

test: enable PostCSS multi-config test in Turbopack production mode Remove the isNextDev restriction so the test also runs during next build (Turbopack production). The test was previously limited to dev mode out of caution after a production panic; the test now verifies per-directory PostCSS config resolution works in both dev and start modes. Co-Authored-By: Claude <noreply@anthropic.com>