Add a user activity dashboard for portal administrators

- Implement the reviewed user activity dashboard in the existing portal using mock data. The selected activity window should control the dashboard summaries, sign-in trend, and audit table.
- Updated designs and implementation progress will be shared in this issue.

Start by locating the existing portal and the reviewed dashboard designs referenced in the issue. Determine how mock data is represented and how the selected activity window reaches the dashboard. Done means the summaries, sign-in trend, and audit table all update for the selected window.

Written by the indexing model from the issue text.