Implement campaign status check in `donate`

[ayshadogo]

User Story:
As a developer, I want donations rejected if the campaign is cancelled or ended so that funds aren't sent to inactive campaigns.
Acceptance Criteria:

• Status check: must be CampaignStatus::Active or CampaignStatus::GoalReached
• Panics with Error::CampaignNotActive for invalid statuses
• Status checked atomically before transfer

---

[khanavi272-spec]

@khanavi272-spec has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I would like to work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @khanavi272-spec to this issue.

[YaronZaki]

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

Hello, please assign me this issue.

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

[augustine00z]

@augustine00z has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi, I’d like to work on this issue.
I can implement the campaign status validation in the donate flow to ensure donations are only allowed for CampaignStatus::Active or CampaignStatus::GoalReached, with proper error handling and atomic checks before transfer execution. I’ll also add tests for the different campaign states.

ETA: 1 day

ℹ️ Repo Maintainers: To accept this application, review their application or assign @augustine00z to this issue.

[drips-wave]

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

🧑‍💻 @YaronZaki: 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.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊