Improve output of autoscaleFormatted() when Duration is exactly 0

Sources/HandySwift/Extensions/DurationExt.swift

@@ -88,8 +88,10 @@ extension Duration {
  /// - For a duration of 25 hours, the output will be `"1d 1h"`, scaling up to days and hours.
  /// - For a duration of 2 days and 0 hours, the output will be `"2d"` as it omits the zero hour part.
  ///
- /// - Returns: A formatted string representing the duration. If the duration is less than a second, it returns `"???"`.
+ /// - Returns: A formatted string representing the duration. If the duration is less than a second, it returns `"???"`. For zero returns `"0s"`.
  public func autoscaleFormatted() -> String {
+ guard self != .zero else { return "0s" }
+
  var leftoverTimeInterval = self.timeInterval
  let fullDays = Int(leftoverTimeInterval.days)