Box scope aggregation visible in the Overview module (fixed columns)

Definition of done:

As a user, I can display the following columns in the Overview module (previously: Program Manager) that will show me the aggregated values calculated based on the scope of the Boxes:

• Status field % distribution across status categories (todo, in progress, done)
• "Time tracking" progress bar (calculated based on Time spent and Remaining Estimate)
• Sum of Time Spent field
• Sum of Remaining Estimate field
• Sum of Original Estimate field

For a particular Box, the aggregation based on the scope is always calculated as follows:

Box scope aggregation = F(Box backlog) + F(sub-Boxes' scopes)
where "sub-Boxes' scopes" are tasks scheduled for sub-Boxes.