Feature Request: Save and view history of past raffles

[Spaccesi]

Summary

There is currently no way to review previous draws. A history log would allow organizers to audit results and avoid repeating winners.

Possible Solution

• Persist each raffle draw locally (SQLite or shared preferences).
• Add a "History" screen listing past raffles with date, participants count, and winners.
• Option to clear history.

Acceptance Criteria

• Each completed raffle is saved automatically.
• History screen shows date, number of participants, and winner(s).
• User can delete individual entries or clear all history.