Fix PostCSS configuration for Tailwind CSS

[coderabbitai]

Issue

The current PostCSS configuration in postcss.config.mjs uses an incorrect plugin name and is missing autoprefixer:

const config = {
  plugins: ["@tailwindcss/postcss"],
};

Recommended Fix

Update the configuration to use the proper plugin names and format:

const config = {
  plugins: {
    tailwindcss: {},
    autoprefixer: {},
  },
};

This change ensures:

• Correct plugin name for Tailwind CSS
• Includes autoprefixer for vendor prefixing
• Uses the proper object format for PostCSS plugins

Reference

This issue was created as follow-up from discussion in PR #1.