use original two greys for syntax for transform source #23

search 663832872 in layout for wip.

it looks good in the tests.

maybe also make this a special capture, distinct for the tab-based ones.

one plan:
for menus with non-hole source, make first item the capture of the source.
first transform is source -> source-capture.
is source 'actually captured' (for matches)?
also populate source-capture -> source transformation.
so pressing enter enter would be the same as tab (a 'half' capture?) (enter enter again uncaptures)