Was: from/to/cc/date meta on the left, action cluster (Reply / Reply
all / Forward / AI reply / Summary / More) pinned to the right of
the header. Now: actions stretch across the top in their two existing
sub-rows, the from/to/cc meta sits below.
Pure CSS — no template restructure. The .email-reader-header flexbox
flips to flex-direction:column, .email-reader-actions gets order:-1
to render first, and the existing flex-end aligned action-row rules
swap to flex-start so buttons read left-to-right across the top
toolbar. Mobile media query overrides bend the same way so the
layout is consistent across breakpoints.
15f2b106ab