Add unit tests for the key simulation tool asserting price impact is computed and displayed correctly

[Chucks1093]

Summary

The price simulation tool computes price impact as (simulated_price - spot_price) / spot_price * 100. Unit tests should assert the computation and display are correct for positive, zero, and negative price impact values.

Scope

• Test that simulated_price of 110 with spot_price of 100 shows price impact of +10.00%
• Test that simulated_price equal to spot_price shows price impact of 0.00%
• Test that the custom quantity input fires a debounced fetch after 300ms
• Test that a fetch error shows 'Unable to simulate price' and hides the impact value
• Test that the loading skeleton is shown while the fetch is in progress

Acceptance Criteria

• +10% impact computed and displayed correctly
• 0% impact computed and displayed correctly
• Custom quantity triggers debounced fetch at 300ms
• Fetch error shows correct error message
• Loading skeleton shown during fetch

ETA: 12 hours

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[Lacastar2000]

@Lacastar2000 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Can I work on this immediately?

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[Wiseman52]

@Wiseman52 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi, kindly assign task. I’ve carefully reviewed the requirements and understand what is needed to resolve the issue.

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[Abba073]

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I would love to work on this issue

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[believetimothy]

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

Hello Maintainer, I can fix this issue.
Please assign me.

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[BaseDev-Eth]

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

hello maintainer, i would love to work on this issue

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