Support for oklab and oklch color functions INSIDE DIRECTIVES

Example

<img width="622" height="254" alt="Image" src="https://github.com/user-attachments/assets/f2fee74d-7c90-4b1d-97a4-0a0701d4ebe2" />

VS Code data data
Version: 1.103.0
Commit: e3550cfac4b63ca4eafca7b601f0d2885817fd1f
Date: 2025-08-06T21:40:10.271Z
Electron: 37.2.3
ElectronBuildId: 12035395
Chromium: 138.0.7204.100
Node.js: 22.17.0
V8: 13.8.500258-electron.0
OS: Linux x64 6.11.0-1018-azure