Fix utility generaFix utility generation for escaped theme keystion for escaped theme keys

[KashviYadav09]

Summary

This PR fixes an issue where utilities are not generated when theme keys contain escaped special characters (e.g. brand\:primary).

Tailwind allows escaped characters in theme configuration keys, but named utility values were not being normalized before theme lookup, which caused matching to fail.

What’s changed

• Added normalization for escaped theme keys
• Ensured named utility values are unescaped before resolving against the theme
• Added tests to cover escaped theme keys in configuration and utility generation

Example

// tailwind.config.js
theme: {
  colors: {
    'brand\\:primary': '#ff0000',
  },
}