Add unit tests for the holdings list sorting entries by total value descending

[Chucks1093]

Summary

Holdings should be displayed with the highest-value position at the top so users immediately see their largest holdings. Unit tests should confirm the list component sorts entries by total_value descending before rendering.

Scope

• Render the holdings list with three entries: total values 500, 1200, and 300
• Assert the rendered order is 1200, 500, 300
• Change the 300 entry to 1500 and assert the order updates to 1500, 1200, 500
• Assert entries with equal total_value maintain a stable secondary order (e.g. by creator ID)

Acceptance Criteria

• Holdings rendered in descending total value order
• Order updates when cache data changes
• Stable secondary sort for equal values
• Sort applied before render, not after

ETA: 12 hours

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[otobongdev]

@otobongdev has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello maintainer, i can fix this issue

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[Ajibose]

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can i work on this

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[Benedict315]

@Benedict315 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Please assign

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[Caneryy]

@Caneryy has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi, I'd like to work on this issue please.

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