Fix flaky round_value property test

[gcomte]

Summary

• Both the original round_value_has_correct_decimal_places and the idempotency rewrite failed for large BTC values (e.g. 37515032.691102825) because (value * 1e8).round() / 1e8 introduces f64 representation errors at that magnitude
• Replaced with a bounded-error test: rounding must not move the value by more than half a unit of the last decimal place (+ f64 tolerance proportional to magnitude)
• Supersedes Fix flaky round_value property test #508

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📥 Commits

Reviewing files that changed from the base of the PR and between 4eebf6a and 558801e.

📒 Files selected for processing (5)

• .github/workflows/build.yml
• .github/workflows/code-analysis.yml
• src/currency/btc.rs
• src/defaults.rs
• tests/int_tests.rs

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• Commit unit tests in branch fix/property-test-floating-point-v2

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