Giveaway wheel

The Giveaway Wheel draws winners from a saved eligibility pool.

Recommended workflow:

1. 1.Create a snapshot.
2. 2.Review eligibility.
3. 3.Draw winners.
4. 4.Record winners.
5. 5.Assign prize roles if needed.
6. 6.Use rerolls only when required.

The backend determines winners before the wheel animation displays them.