horizonErrorMap: test nested Axios extras extraction

[CemAyyildiz]

Goal

Add a test for code extraction from response.data.extras.result_codes shape.

Context

frontend/lib/horizonErrorMap.test.ts.

Acceptance criteria

• One new Vitest case
• Frontend tests pass

Out of scope

• Merging with horizonStatus.ts

Conflict rule

Only edit horizonErrorMap.test.ts.

[xtep103]

@xtep103 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi Maintainer, I’d like to work on this issue. I’ve handled similar tasks before and can get started right away.

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[cythecode]

@cythecode has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Reviewed the issue in detail and have a strong full-stack background that aligns well with this task. No blockers on my end—I’m ready to jump in and submit a PR shortly. Please assign it to me.

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[samjay8]

@samjay8 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I'd like to work on this.

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[webdevayo]

@webdevayo has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Please kindly assign

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