Add property-based tests for BitcoinUnit conversions

[gcomte]

Summary

• Add proptest dev dependency and 4 property-based tests for BitcoinUnit
• Tests verify: roundtrip conversion preserves values (within f64 precision), btc_value() is always positive, order is preserved across unit conversions, and round_value() respects decimal_places()
• Derive Clone on BitcoinUnit (required by proptest's Just)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 9e8fe0a1-cdaf-43cf-a0e9-9fc3db5a3ce8

📥 Commits

Reviewing files that changed from the base of the PR and between 0fc0ae0 and c01efc4.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (2)

• Cargo.toml
• src/currency/btc.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/add-property-based-tests

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