Contracts: Add minimum share supply guard to prevent dust state lockups

[Junirezz]

Prevent edge-case dust lockups by enforcing minimum share supply constraints.

[Code-haeler]

@Code-haeler has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hiii, Good Morning Ser, I love your product, and I would love to solve this issue and solve it accurately.

Thank you for granting my request.

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[success-OG]

@success-OG has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hii, i'd like to work on this issue

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

[drips-wave]

Congratulations, @success-OG! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @success-OG: 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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