[IntelliSense] OKLCH/LCH support for (custom) colors preview

[tunnckoCore]

Hey there. Just realized that if i have oklch color inside the extend.colors.<name>.<shade> it doesn't show it on the markup like when it's any other format.

module.exports = {
  darkMode: "class",
  content: ["./src/**/*.{astro,html,js,jsx,md,mdx,svelte,ts,tsx,vue}"],
  theme: {
    extend: {
      colors: {
        testcolor: 'red', // this works
        primary: {
          50: "oklch(0.982 0.006 308.396)",
          100: "oklch(0.955 0.013 306.027)",
          200: "oklch(0.907 0.027 307.037)",
          300: "oklch(0.833 0.05 307.793)",
          400: "oklch(0.66 0.105 305.981)",
          500: "oklch(0.497 0.138 304.107)",
          600: "oklch(0.394 0.105 304.367)",
          700: "oklch(0.321 0.08 303.758)",
          800: "oklch(0.231 0.053 304.833)",
          900: "oklch(0.166 0.029 308.263)",
        },
        secondary: {
          50: "oklch(0.93 0.029 249.766)",
          100: "oklch(0.907 0.039 249.445)",
          200: "oklch(0.884 0.049 250.26)",
          300: "oklch(0.815 0.08 249.956)",
          400: "oklch(0.681 0.142 252.181)",
          500: "oklch(0.567 0.194 256.449)",
          600: "oklch(0.526 0.178 256.142)",
          700: "oklch(0.463 0.154 255.905)",
          800: "oklch(0.394 0.129 255.677)",
          900: "oklch(0.345 0.11 254.881)",
        },
      }
    }
  }
}

Not to mention that if a plugin adds such, they don't work too. But that's kinda easy fix, i just duplicate them from the plugin and adds them in my config. which seems dumb but..