Show statistics about the total amount of time spent learning a card and how often it got skipped
The list should show all cards that are part of a learning phase. This feature is available for both private learning and a bonus. In addition, the lecturer should have an option to compare the statistics with previous learning phase bonuses.
Fields for this statistic should include:
- Number of times skipped
- Total time learned across all bonus participants
- Median time learned across all bonus participants