Fix duplicate get_dispute_window and dead constant usage

[hman38705]

Issue 032: Fix duplicate get_dispute_window and dead constant usage

Area: Contracts
Priority: High
Files: contracts/predict-iq/src/modules/resolution.rs

Problem

Two get_dispute_window functions exist; one references undefined DISPUTE_WINDOW_SECONDS. Compile errors block deployment.

Acceptance Criteria

• Single implementation remains\n- Compile errors are removed\n- Unit tests cover default and configured values\n- Constant is defined with appropriate bounds

[Realericky]

@Realericky has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hi. I would like to work on this

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Congratulations, @Realericky! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

🧑‍💻 @Realericky: 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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This issue has been completed by @Realericky as part of the Stellar Wave Program's 4th Wave 🥳

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