Autoscroll webpage content?

Lots of sites use load on demand, I've been manually scrolling to get the content to load in then running a summary on it, but it might be useful to add an option where the extension auto scrolls or loads in content to a certain length before gathering the summary.

Start by locating the extension entry point that gathers webpage content before sending it for summarization. Clarify whether completion is based on a scroll limit or loaded-content length, then verify that the chosen option gathers the requested content before summarization without affecting existing pages.

Written by the indexing model from the issue text.