Implement withdrawal timing restrictions

[Akshola00]

Description

Only allow withdrawal after the event is Completed to prevent scams.

Testing Requirements

Test withdrawal before deadline fails.

• Crucial: Ensure all standard GitHub CI checks pass before submitting your PR!

Links

• See contributor.md for guidelines.

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This issue has been added to the Stellar Wave Program and is worth 150 Points.

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[flavor365]

@flavor365 has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

I'm a software dev, may I take on this issue if it's still available?

ℹ️ Repo Maintainers: To accept this application, review their application or assign @flavor365 to this issue.

[JayWebtech]

@JayWebtech has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hello, I want to work on this

ℹ️ Repo Maintainers: To accept this application, review their application or assign @JayWebtech to this issue.

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Congratulations, @JayWebtech! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

🧑‍💻 @JayWebtech: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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