Replace deprecated Error::description() with thiserror

[gcomte]

Summary

• Remove deprecated Error::description() impl from InputError
• Use thiserror derive macro instead, matching CurrencyParseError's approach
• Remove manual Display and Error impls (now generated by thiserror)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 46a43689-249c-4bf6-b2e1-e1505ebe97f6

📥 Commits

Reviewing files that changed from the base of the PR and between 31e01f9 and 14023a5.

📒 Files selected for processing (1)

• src/cli_input.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/remove-deprecated-error-description

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