System health dashboard: live Horizon/Soroban latency probes

[Nanle-code]

Labels: observability

Description

SystemHealth.jsx should show real probe results, not static placeholders.

Tasks

Periodic HEAD/GET to current NETWORKS URLs from stellar.ts.
Chart latency in src/components/charts/AnalyticsChart.jsx.
Surface circuit breaker state from src/lib/errorHandling/CircuitBreaker.ts.
Acceptance criteria

Per-network Horizon + Soroban status (up/degraded/down).

Last 24h latency sparkline.
Files

src/components/dashboard/SystemHealth.jsx
src/lib/stellar.ts (NETWORKS, getServer, getSorobanServer)
src/lib/errorHandling/CircuitBreaker.ts
src/hooks/useMonitoring.js

[Anieblin]

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

Hi Maintainer, I'd love to work on this project

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

[drips-wave]

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

🧑‍💻 @Anieblin: 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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[drips-wave]

This issue has been completed by @Anieblin as part of the Stellar Wave Program's 5th Wave 🥳

😎 @Anieblin: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

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