Add a statistics ticker along the bottom of the Tasks page

[wildjames]

Some fun digested highlights should scroll along. Like, "James has scrubbed the toilet 3 times this month", or "Charlotte earned the most BP today", and so on.

[wildjames]

• "Well done [X] for doing [TASK] [N] times this month!"
• "[X] doesn't normally [TASK], but they did this month! Well done"
• "[X] is most likely to do [TASK]. Keep it up, [X]!"