Add hover for ByDay and ByHour Graphs

[ION28]

when you hover, it should show the total number of tasks completed,

also if all projects are selected, each bar in the stacked bar could have # completed, percentage, and project in their hover box

[ION28]

As a detail-oriented user, I want to see more info about the hour/day (like specific # completed) so that I can specifically analyze my productivity at that time.