Add unit tests for the transaction type badge rendering the correct label and colour for buy and sell transactions

[Chucks1093]

Summary

The transaction history list shows a coloured badge for each transaction type. Unit tests should confirm the correct label and colour class are applied for buy and sell and that an unknown type falls back gracefully.

Scope

• Test a buy transaction renders a green badge with label 'Buy'
• Test a sell transaction renders a red badge with label 'Sell'
• Test an unknown type renders a grey badge with label 'Unknown'
• Assert no error thrown for any of the three cases

Acceptance Criteria

• Buy renders green badge with 'Buy' label
• Sell renders red badge with 'Sell' label
• Unknown type renders grey 'Unknown' badge without throwing
• No error thrown for any case

ETA: 12 hours

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[divysam]

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[Mosas2000]

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[B3N-max]

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