Mail · Writing: the composer, recipients that suggest, a signature, send later

MailComposer writes a message: To, and Cc and Bcc once asked for, as
tag fields that suggest contacts and mark what is not an address; the
subject and the words; the files, each with a way off; the signature
under the words. Send wakes once there is someone to send to and every
address is one; it hands over the draft now or at a time, and Discard
lets it go. A new start from the owner begins the draft over.

forms::TagInput now suggests: the rows that hold the typed words float
under it through the list Combobox uses; Up, Down and Enter pick, and
Escape sets them aside. RecipientInput points to it. ScheduleSend
offers tomorrow morning, tomorrow afternoon, Monday morning, or a day
and hour picked in a dialog. SignatureEditor writes the lines and shows
how they sit under a message; it tells the owner's echo from a new
signature, so the caret stays.

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

src/mail/mod.rs

@@ -1,14 +1,20 @@
 mod boxes;
+mod compose;
 mod list;
 mod quoted;
 mod reader;
+mod send;
+mod signature;
 mod thread;
 
 #[cfg(all(test, feature = "test-support"))]
 mod tests;
 
 pub use boxes::{Mailbox, MailboxList};
+pub use compose::{Draft, MailComposer};
 pub use list::{Mail, MailItem, MailList};
 pub use quoted::QuotedText;
 pub use reader::{Contact, MailReader, Message};
+pub use send::ScheduleSend;
+pub use signature::SignatureEditor;
 pub use thread::MailThreadView;