Shows the inverse of the existing "1 BTC to <currency>" rate — how many Sats one unit of the default currency is worth — right below it. Useful since many currencies are worth less than, or a low multiple of, a single Sat. CurrencyConverter.satsPerCurrencyUnit(rate) does the actual division; ConverterUiState.oneCurrencyToSats() derives the display string from the already-fetched rate the same way defaultCurrencyRate() does, so no new ViewModel state was needed. Wired into both Compose and the iOS bridge/SwiftUI. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FXcrACM5sok3M1KQJ8kByy