bin/59956: gpt(8): show human-readable units

["campbell+netbsd%mumble.net@localhost via gnats" <gnats-admin%NetBSD.org@localhost>]

>Number:         59956
>Category:       bin
>Synopsis:       gpt(8): show human-readable units
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Feb 01 20:55:00 +0000 2026
>Originator:     Taylor R Campbell
>Release:        current, 11, 10, 9, ...
>Organization:
The NetGPT Unitation
>Environment:
>Description:
# gpt show sd2
     start      size  index  contents
         0         1         PMBR (active)
         1         1         Pri GPT header
         2        32         Pri GPT table
        34      2014         Unused
      2048   2881536      1  GPT part - NetBSD FFSv1/FFSv2
   2883584    262144      2  GPT part - NetBSD swap
   3145728   1515520      3  GPT part - NetBSD FFSv1/FFSv2
   4661248    262144      4  GPT part - NetBSD FFSv1/FFSv2
   4923392  55705600         Unused

Would be nice if this could show units of KiB/MiB/GiB/TiB.
>How-To-Repeat:
gpt show diskN
>Fix:
Yes, please!