feat(mail-overview): title, icon and spaced bullet body

A live test showed the old title ("<label> · N new") read poorly
and the body packed the rows into one block. Title is now
"New Mail - <label> (N)" with the mail-unread icon, and each
message is a bullet on its own line with a blank line between.
+N more counts rows, not physical lines, so the blank lines do
not skew it.

0 files changed, 0 insertions, 0 deletions