Mail · Boxes and lists: mailboxes, folders and labels, the mail list, inbox zero

MailboxList sets mailboxes, folders and labels in sections: a press, an
arrow or Enter opens one, the open one lit; a box with mail unread
stands out with its count, and a label wears one of the theme's chart
hues. MailList holds messages in a multiple-select list: the sender
strong beside a dot while unread, the subject and first words under
it, the time today, the weekday this week, the date this year or with
its year, a paperclip for files, and a star whose press stays off the
row. InboxZeroState points to feedback::EmptyState.

Sections of selectable lists now have one home, lists::Sections, which
ChannelList and MemberList use too; ListItem gains a third line.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/mail/mod.rs

@@ -0,0 +1,8 @@
+mod boxes;
+mod list;
+
+#[cfg(all(test, feature = "test-support"))]
+mod tests;
+
+pub use boxes::{Mailbox, MailboxList};
+pub use list::{Mail, MailItem, MailList};