chamonix,
Sorry for the late response, life has been hectic!
Regarding the dinner, I read it in several places, one of them being the
Dreams Unlimited site, and the "official" Disney site. They both detail the Grand Plan, and it says that it includes dinner at Napa Rose (? is that the name of the restaurant in GC?). It doesn't say what comes with the dinner though (appetizer, entree dessert, etc.).
It sounds like a set thing...if you stay at DL Hotel, there's only one restaurant included in the Grand Plan there, and same for the former DL Pacific Hotel (can't remember the new name they changed it too). There isn't a choice of restaurants.
As far as breakfast, the Grand Plan includes two options: breakfast, and/or two different DL tours. My guess is the question they asked you was in regards to that.
I'm so excited for you, have a great time!!!