testing: add unit tests for useRewardDistribution

[nanaf6203-bit]

Summary

src/hooks/useRewardDistribution.ts lacks unit tests for the bell-curve distribution algorithm and receipt shape.

Affected area

src/hooks/useRewardDistribution.ts, src/hooks/__tests__

Steps to reproduce

There is no test file.

Expected behaviour

Add tests for correct weighting, empty rewards, max-distribution cap, and re-render frequency.

Acceptance criteria

• >90 % branch coverage on the hook.
• Mocked provider confirms correct BigInt math.

[Kayce10]

@Kayce10 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello Sir,

I came across your project and will love to have the opportunity to work on it

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Kayce10 to this issue.

[gbengaeben]

@gbengaeben has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi Maintainer,

I’d love to work on this issue. I’ve reviewed the requirements and believe I can implement the solution according to the project’s guidelines and best practices.

If the issue is available, I’d be happy to take ownership and submit a PR for review.

Thank you for your consideration

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

[drips-wave]

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

🧑‍💻 @gbengaeben: 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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[drips-wave]

This issue has been completed by @gbengaeben as part of the Stellar Wave Program's 6th Wave 🥳

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