Tailwind 4 Support

[boylett]

Development of Tailwind 4 is in full swing!

Currently, TRR does nothing when working on projects that utilize TW4's CSS-based config, unless I place an empty tailwind.config.js file into my project.

Since TW4 does not require a config file, it would be great if TRR could make use of TW4's CSS config file - whether by scanning the project for a CSS file that imports tailwindcss or a manual filename setting.