📝 Add docstrings to feat/transactions-output-formats

[coderabbitai]

Docstrings generation was requested by @geavenx.

• feat(account): add csv and json output for transactions #2 (comment)

The following files were modified:

• src/arcter/cli.py
• tests/test_account_cli.py

These file types are not supported

• AGENTS.md
• README.md

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