[Frontend] Add network health status widget

[floxxih]

Display lightweight network/service health indicators for supported chains and API backend.

Acceptance Criteria:

• Status values are fetched and cached
• Unknown state has neutral UI
• Widget does not block core workflows

[zhero-o]

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

Hi, I would like to work on this issue. Can I get assigned?

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[johnsmccain]

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

i would like to work with you

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[drips-wave]

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

🧑‍💻 @johnsmccain: 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 @johnsmccain as part of the Stellar Wave Program's 5th Wave 🥳

😎 @johnsmccain: 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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