AI assistance

Added a simple screen to try AI assistance with Google Gemini AI (free version). Note that it can only answer general Qs about the particular book you clicked, not specific Qs concerning the content in the book, for copyright reasons (at least that is what Gemini said). Even if it can (by pass copyright, feed the whole text in the book to AI), almost certainly it can't answer specific Qs as accurate as authors/experts do.

For now, AI assistance might just be used to provide organized search results, sometimes can be erroneous. Maybe later can be used to find experts and deal with the communication part.

One can access this screen by click the icon after "Ask AI general Qs" of the book page.