Front-components compile to a remote-dom worker, so a CSS import like
`import 'twenty-ui/style.css'` can't load a stylesheet and was breaking
the build at the manifest step.
This makes the build inline an imported CSS file as a runtime `<style>`
injection that flows through the existing style bridge into the host.
Because the CSS is bundled alongside that same build's hashed class
names, an app's styling matches its own twenty-ui version regardless of
which version the host ships — no server, manifest, or host changes
needed.
The manifest extractor keeps the no-op CSS loader (it executes the
bundle in Node, where `document` is undefined); the inject plugin runs
only in the real build and the dev watcher.
Raphaël Bosi