fullPage property
When true the widget skips the FAB and the open/close animation entirely and mounts the chat directly so it reads as the page itself. The close button is hidden so the chat cannot be dismissed by the user.
Use this when the chat IS the surface (a dedicated screen, tab, or route in the host app) rather than a floating helper that expands on top of other content.
onOpen and fabWidget are ignored in this mode.
Implementation
final bool fullPage;