Regarding the daily games (e.g. Daily Game, Pot of Gold) which give bonus FT points if you end the day in the top ten...

As they wouldn't be calculated until after midnight, do those points go on that day's scores or the following day's scores?

They're added to the following day.

see this thread from Oct 2012: Which Daily games give bonus points

Well, that was a relief to read, because I was going for the More Point Precision badgelet.

However, I didn't account for the Gold Madness game, which evidently rolls over at 11pm CST not midnight, so that burst the bubble.

Those bonus points can catch you out. I had the Twin challenge yesterday and thought I'd calculated perfectly. I forgot I'd played an hourly game, though, and gained an unwanted (at that stage) 30 bonus points, which pushed me over my target. Entirely my own fault, but it was a blow!