Unify labels, byte units, snapshot numbers and spelling

mac/Sources/Byre/Updater.swift

@@ -120,10 +120,6 @@ final class Updater: NSObject, SPUUserDriver, SPUUpdaterDelegate {
         panel = nil
     }
 
-    private func bytes(_ n: Double) -> String {
-        Int64(n).formatted(.byteCount(style: .file))
-    }
-
     func updater(_ updater: SPUUpdater, willInstallUpdateOnQuit item: SUAppcastItem, immediateInstallationBlock immediateInstallHandler: @escaping () -> Void) -> Bool {
         staged = (item, immediateInstallHandler)
         now = ask(item)
@@ -184,9 +180,9 @@ final class Updater: NSObject, SPUUserDriver, SPUUpdaterDelegate {
     func showDownloadDidReceiveData(ofLength length: UInt64) {
         progress.done += Double(length)
         if let total = progress.total {
-            progress.detail = "\(bytes(progress.done)) of \(bytes(total))"
+            progress.detail = "\(bytes(Int64(progress.done))) of \(bytes(Int64(total)))"
         } else {
-            progress.detail = bytes(progress.done)
+            progress.detail = bytes(Int64(progress.done))
         }
     }