Build: `experimental.lightningCssFeatures` exclude list not honored

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Description

This issue was created by an agent analysing CI failures from the Next.js Deploy Suite (vinext main vs Next.js v16.2.6, 2026-05-22).

Problem

Setting lightningCssFeatures to exclude light-dark() should preserve the CSS function untransformed. vinext still transforms it into var(--lightningcss-light, ...) polyfill output, ignoring the exclude config.

Excluded `light-dark()` still transformed by LightningCSS

Estimated Impact

~1 test failures across the deploy suite.

Affected Test Suites

test/e2e/app-dir/experimental-lightningcss-features/experimental-lightningcss-features.test.ts

Recommendation

Reproduce first in vinext's own test suite. Configure experimental: { lightningCssFeatures: { exclude: ['light-dark'] } } and assert the function survives in the output.
Plumb the exclude list into LightningCSS. Read lightningCssFeatures.exclude and pass it as the corresponding exclude bitmask/options when calling LightningCSS.

Guide contributeur

Direction de recherche: Reproduisez l'echec du test localement, puis tracez comment `lightningCssFeatures.exclude` est consomme dans le code d'integration LightningCSS pour identifier ou la logique d'exclusion est contournee.
Stack technique: typescriptnodejscss
Domaine: build systemtooling
Type d'issue: Bug
Difficulté: 2
Temps estimé: 1-3 heures
Statut d'activité: Active
Clarté: Claire
Prérequis: GitNode.js
Accessibilité débutant: 75