Bug: SDK crashes when Horizon is unreachable

[Jaydbrown]

Describe the bug

If the user's internet drops or the Horizon RPC goes down, streamClient.getStream() throws an unhandled TypeError: fetch failed or similar.

Expected Behavior

It should catch the network error and throw a standardized StreamFiNetworkError, which the frontend can easily catch and display as a 'Network Offline' banner.

[Netty-kun]

@Netty-kun has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello Maintainer, I'd like to take this issue. I've reviewed the requirements and have experience with similar implementations. If assigned, I'll begin immediately and work toward delivering a clean, production-ready PR as quickly as possible.

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

[drips-wave]

Congratulations, @Netty-kun! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

🧑‍💻 @Netty-kun: 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

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🤠 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 🌊

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@Netty-kun's PR #398 was approved and merged by @Jaydbrown.

🏆 @Netty-kun: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (398 total points). Track your full progress on GrantFox.

👏 Great work, @Netty-kun! Keep contributing to conduit-protocol.