`snapshot list`, the `snapshot purge` listing and the `bytes` value in
terminal log lines divided by 1024 while labelling the result KB or MB,
so 6,329,198 bytes read 6.0 MB there and 6.3 MB in every other command.
All three now use humanize.Bytes, as the rest of the program does, and
the 1024-based helper in internal/vaultik is removed.
The size shared by the list tests is now 5,000,000 bytes, which the two
ways of counting print differently.
Judgement call: the log handler's copy of the formatter is changed too,
since the issue asks that every command print a byte count the same way.
Model: opus-5-5
clawbot