no autocomplete for ssh-copy-id

this is not a big deal, but I noticed it when moving some keys.

ssh-copy-id has doesn't autocomplete arguments like the other commands. It also doesn't have in-line help like the other cmds.

would be nice it it could offer up the list of keys stored in blink, then do the same for hosts like mosh and ssh do.

semi-related since it's the inline help, but not sure it's worth a bug of its own: the right edge of graphics is clipped on the inline help at some font sizes, but not others.

Start by comparing ssh-copy-id completion and inline-help behavior with the existing mosh and ssh commands, using the command's current implementation and related completion or help entry points. Done means ssh-copy-id offers stored keys and hosts as completions and provides inline help; the graphics-clipping note is a separate, unresolved concern.

Written by the indexing model from the issue text.