Tailwind & global.css issues

[Zasa-san]

After #7543 there's a problem when running hot if the global.css file has not been created previously. An error is thrown since the file doesn't exist, and tailwind has to be run once to create the file.

The issue seems to be that our tailwind-watch is not really working, at least not in the context of running hot.

This is not a problem for end users since building the app will correctly generate global.css, and update it if necessary.