Candidate rows lead with domain icons instead of localized text
prefixes; pointer and keyboard share one reducer-owned highlight (last
input wins); drillable folder rows reveal a localized Browse-folder +
Tab keycap hint with the library chevron; pending sources render
skeleton bars; the menu spans the composer card. The editable @dir/
text decorates color-only — the domain icon now belongs exclusively to
the settled reference chip. Composer placeholders advertise / and @,
and the zh copy for commands is unified to 指令.