SingleFile CLI 2.7.2

CLI fixes

a page whose server takes more than about a second to answer is captured once it is loaded. The wait accepted the events of the blank page opened before the navigation, whose network goes idle while the server has not answered yet, so the page was captured as soon as its document was created. A page whose body was still arriving failed with Cannot read properties of null (reading 'tagName') and exit code 1, a small page was saved by luck

Co-authored by Claude (Claude Code)