Add "Claim" flow for rewards contract

[joelpeace48-cell]

Add UI to enter amount and call rewards contract claim(user, amount). Sign with connected wallet and show tx result and updated balance.

[drips-wave]

This issue has been added to the Stellar Wave Program and is worth 200 Points.

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[Jayy4rl]

@Jayy4rl has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hi, I would like to work on this issue. ETA 4 hours

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Jayy4rl to this issue.

[drips-wave]

Congratulations, @Jayy4rl! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

🧑‍💻 @Jayy4rl: 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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