feat(email): save sent messages to IMAP Sent

- append sent messages byte-for-byte through a writable folder
- avoid duplicate copies when the server already filed the message
- report unresolved, failed, and unverified save outcomes
- update dialog status text to distinguish send and filing results
- extend fake IMAP coverage for APPEND literals and save behavior

1 files changed, 3 insertions, 0 deletions

diff --git a/src/m_email/EMailModule.cpp b/src/m_email/EMailModule.cpp
index d805ee2..e870934 100644
--- a/src/m_email/EMailModule.cpp
+++ b/src/m_email/EMailModule.cpp
@@ -376,6 +376,9 @@ auto GFRegisterModule() -> int {
   qRegisterMetaType<EMailMessagePage>("EMailMessagePage");
   qRegisterMetaType<EMailOutgoingMessage>("EMailOutgoingMessage");
   qRegisterMetaType<EMailSendReceipt>("EMailSendReceipt");
+  // Crosses a thread boundary as a queued signal argument, so it has to be
+  // known to the metatype system by name before the first one is emitted.
+  qRegisterMetaType<MailSentSaveOutcome>("MailSentSaveOutcome");
 
   // vmime's platform handler is assigned lazily with no synchronisation, so
   // two worker threads racing their first connection could construct it twice.