Replace Absent Winners and Mark Them as Invalid for Future Rounds

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User Story

As an event organizer using the raffle application,
I want to be able to replace winners who are no longer at the event,
So that I can ensure prizes are awarded to attendees who are present.

Description

Currently, when a winner is drawn in the raffle, there is no way to handle the scenario where the winner has left the event before the prize can be awarded. We need a feature to:

• Mark a winner as "absent" directly from their winner card.
• Automatically draw a replacement winner when someone is marked as absent.
• Ensure that absent winners are excluded from future draws in all rounds.
• Visually distinguish between present winners and absent winners in the interface.

Acceptance Criteria

• Add an "Absent" button to each winner card.
• When the "Absent" button is clicked, mark the winner as absent and draw a new winner for that prize.
• Store absent winners in session state and exclude them from all future draws.
• Apply visual styling to indicate absent winners (e.g., grayed out or with a specific label).
• Include absent winner information in the CSV export, marked appropriately.
• Ensure the total count of winners remains accurate in the session information sidebar.

Technical Implementation Details

• Modify the winner card display to include an "Absent" button.
• Create a function to handle marking a winner as absent and redrawing.
• Add a new session state variable to track absent participants.
• Update the draw_winners function to exclude both previous winners and absent participants.
• Modify the CSV export to include an "absent" status column.

Testing Scenarios

• Test replacing a winner in a single-winner round.
• Test replacing a winner in a multi-winner round.
• Verify absent winners do not appear in subsequent rounds.
• Test exporting results after marking winners as absent.
• Test edge cases (e.g., when all remaining participants are absent or have won).

Priority

Medium

Effort Estimate

Medium (4-6 hours)

Dependencies

None