Count and display running totals of user nominators, voters, and entries per category

Would be great to be able to see how many users have logged in and nominated (during nominations) and how many have logged in and voted (during voting.)
If they nominated (or voted) for multiple categories the counts would increase per category, but not per user.
For example:
During nominations, User A nominates in Best Novel and Best Series. User B nominates in Best Novel only. User C nominates in Best Novel and Best Editor Long.
The counts would be:
Total users = 3
Best novel = 3
Best series = 1
Best Editor long = 1

If User A logged back in later and nominated in Best Editor Long, the counts would be:
Total users = 3
Best novel = 3
Best Series = 1
Best editor long = 2

If it maintained a running count the whole time it would need to be able to subtract if someone were to remove nominations or votes in a category. If it only displayed totals once nominations and then later voting had closed, this wouldn't matter.

Current state this is all done manually from report.

No files or tests are named. Start by locating the existing report-generation path and the data handling nominations and votes; compare those records with the per-category examples in the issue. Done means the requested user and category totals are displayed and the intended behavior for removed nominations or votes is covered.