feat(clerk-js): Introduce CSS variable support within appearance prop

[alexcarpenter]

Description

Replace JS color manipulations with native CSS color-mix to enable the use of CSS variables within appearance prop.

In the following example, brand is a hex value, but any CSS color format would be supported.

:root {
  /* HEX */
  --brand: #6c47ff;
  /* OKLCH */
  --brand: oklch(0.56 0.25 283.67);
}

<ClerkProvider
  appearance={{
    variables: {
      colorPrimary: 'var(--brand)'
    }
  }}
/>

Example generated CSS: https://codepen.io/alexcarpenter/pen/PwqbrpE?editors=0100

---

This makes it so that folks can easily switch between light and dark themes.

:root {
  --brand: #6C48FF;
}

/* dark mode class */
.dark {
  --brand: #8761FF;
}

/* or media query */
@media (prefers-color-scheme: dark) {
  :root {
    --brand: #8761FF;
  }
}

Checklist

• pnpm test runs as expected.
• pnpm build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

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Latest commit: f7ebfcc

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