feat(eslint): enhance unoFunctions option with nested object expressions

[julienbenac]

This PR enhances the @unocss/order ESLint rule to properly handle nested object expressions in custom functions like cva and tv, ensuring UnoCSS class ordering is correctly applied throughout complex component variant structures.

🐛 Problem

The @unocss/order ESLint rule was not properly traversing and ordering UnoCSS classes within nested object expressions used by popular variant libraries like class-variance-authority (cva) and tailwind-variants (tv). The unoFunctions option only worked with functions accepting simple string parameters, which worked perfectly with utility functions like clsx and cx:

clsx('text-sm px-2 py-1') // ✅ Correctly processed
cx('text-base px-4 py-2') // ✅ Correctly processed

However, it failed to traverse and process functions with nested object expressions like cva and tv, resulting in inconsistent class ordering in component variant definitions where classes within nested objects remained unprocessed.

✨ Changes

This enhancement introduces intelligent object traversal capabilities to the @unocss/order rule, enabling it to recursively process nested object expressions within function calls.

Before

cva('top-1 bottom-1', { // ❌ Not processed
  variants: {
    size: {
      small: 'px-2 text-sm py-1', // ❌ Not processed
      medium: 'px-4 text-base py-2' // ❌ Not processed
    }
  }
})

tv({
  base: 'top-1 bottom-1', // ❌ Not processed
  variants: {
    size: {
      small: 'px-2 text-sm py-1', // ❌ Not processed
      medium: 'px-4 text-base py-2' // ❌ Not processed
    }
  }
})

After

cva('bottom-1 top-1', { // ✅ Correctly processed
  variants: {
    size: {
      small: 'text-sm px-2 py-1', // ✅ Correctly processed
      medium: 'text-base px-4 py-2' // ✅ Correctly processed
    }
  }
})

tv({
  base: 'bottom-1 top-1', // ✅ Correctly processed
  variants: {
    size: {
      small: 'text-sm px-2 py-1', // ✅ Correctly processed
      medium: 'text-base px-4 py-2' // ✅ Correctly processed
    }
  }
})

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