Add Stellar network status banner

[grantfox-oss]

Summary

Stellar's Horizon endpoints occasionally experience degraded performance or downtime. When this happens, searches fail with generic error messages that give the user no context. This issue adds a network status indicator that checks Horizon's / root endpoint on mount and displays a warning banner if the response time exceeds a threshold or the request fails entirely.

Task

• Create src/lib/network-health.ts with a checkHorizonHealth(network) function that makes a lightweight GET request to the Horizon root endpoint and returns "ok" or "degraded" based on whether the response arrives within 3 seconds.
• Run the health check on mount in src/app/page.tsx and on network toggle.
• If the result is "degraded", show a dismissible amber banner above the search form with a message such as "Horizon may be experiencing delays. Results could be slower than usual."
• Do not block the form or disable search based on the health result. The banner is informational only.

Acceptance Criteria

• A degraded Horizon response (simulated by a slow or failing fetch) triggers the amber banner.
• The banner can be dismissed by the user.
• A healthy response shows no banner.
• The health check re-runs when the user switches networks.
• The form and search remain fully functional regardless of the health status.

Files in Scope

• src/lib/network-health.ts (new file)
• src/app/page.tsx

[Kureszn]

I've reviewed the issue and believe I can contribute effectively. My experience spans software development, blockchain technologies, cybersecurity and open source collaboration. I take a structured approach to contributions carefully understanding the existing codebase, identifying the root cause and delivering a thoroughly tested implementation.

[Codex723]

I will implement the checkHorizonHealth function in src/lib/network-health.ts that makes a lightweight GET request to the Horizon root endpoint with a 3-second timeout, returning "ok" or "degraded" based on the response. I will integrate the health check into src/app/page.tsx to run on mount and on network toggle, rendering a dismissible amber banner when degraded without blocking the search form in any way.

[Kureszn]

I've reviewed the issue and believe I can contribute effectively. My experience spans software development, blockchain technologies, cybersecurity and open source collaboration. I take a structured approach to contributions carefully understanding the existing codebase, identifying the root cause and delivering a thoroughly tested implementation.

[444notdotun]

I would love to work on this issue. I have experience building production ready applications and collaborating through GitHub workflows. I'll carefully analyze the current implementation, propose a reliable solution, and submit a well-tested PR. My focus is on clean code, maintainability, and timely delivery

[YfengJ]

Hi maintainers, I would like to apply for this issue if it is still available.\n\nIf assigned, I would keep the change focused on the requested health indicator: add a small checkHorizonHealth(network) helper with a 3-second timeout/abort path, call it on initial load and network switches, render a dismissible amber informational banner only when degraded, and make sure search remains enabled regardless of health status. I would add focused tests/mocks for healthy, slow/failing, dismissed, and network-switch behavior before opening the PR.\n\nI will wait for GrantFox assignment or explicit maintainer confirmation before cloning, implementing, or opening a PR.