formatNight
Format a raw NIGHT balance (smallest units) as a human display string, trimming trailing zeros: 5_000_000 → "5", 1_500_000 → "1.5", 0 → "0".
Format a raw NIGHT balance (smallest units) as a human display string, trimming trailing zeros: 5_000_000 → "5", 1_500_000 → "1.5", 0 → "0".