An Android WebView wrapper has no browser pop-ups, so a foldable could not
show two sessions, or a session and a file, side by side. A wrapper that can
open a window of its own now exposes window.CodemanHost.openWindow(url);
detachSession, detachFilePreview and openWebviewExternal hand their URL to
it, mobile.css keeps the pop-out icon under html.host-windows, and a solo
window closes and raises itself through the host when it offers the calls.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
