Mail · Reading: a message reader, a conversation, and quoted text

MailReader opens a message under its subject: the sender's picture,
name and address, who it went to, when it came, and Reply, Reply all
when it went to more than one, and Forward, each only with a handler;
then its words and its files, each downloadable. MailThreadView lays a
conversation oldest first: the newest stands open, the others fold to
a line of the sender, their first words and when, which a press, Enter
or Space opens. QuotedText folds words quoted from before behind a
small mark; open, they sit behind a rule. Long names give way at the
label width.

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

src/mail/mod.rs

@@ -1,8 +1,14 @@
 mod boxes;
 mod list;
+mod quoted;
+mod reader;
+mod thread;
 
 #[cfg(all(test, feature = "test-support"))]
 mod tests;
 
 pub use boxes::{Mailbox, MailboxList};
 pub use list::{Mail, MailItem, MailList};
+pub use quoted::QuotedText;
+pub use reader::{Contact, MailReader, Message};
+pub use thread::MailThreadView;