Capturing error in Barte "refund_transaction"

[mdcg-buser]

Modificações no client.py

• refund_charge (linhas 170-182): Adicionada verificação de erro que lança BarteError
• partial_refund_charge (linhas 184-199): Adicionada verificação de erro com isinstance(json_response, dict) antes de verificar "errors" (necessário porque o sucesso retorna uma lista)

Novos testes no test_client.py

• Fixture mock_refund_error_response (linhas 106-121): Resposta de erro para refunds
• test_refund_charge_with_error (linhas 726-739): Testa que refund_charge lança BarteError
• test_partial_refund_charge_with_error (linhas 741-756): Testa que partial_refund_charge lança BarteError

[CLAassistant]

All committers have signed the CLA.

[Copilot]

Pull request overview

This PR adds explicit error handling for refund operations and introduces tests to validate the new behavior when the API returns an error response.

• Add BarteError raising on refund endpoints when the API returns an errors payload
• Ensure partial_refund_charge checks for dict response before error inspection (success is a list)
• Add tests and a fixture to validate error handling for refund and partial refund

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
barte/client.py	Adds error handling for refund_charge and partial_refund_charge by detecting "errors" in the API response and raising BarteError.
tests/test_client.py	Adds a refund error fixture and two tests asserting BarteError is raised for refund and partial refund error responses.

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[avelino]

LGTM, PR resolve o problema proposto
porem podemos melhorar com as sugestões que trouxe aqui