fix: IMAP sync - use imap_uid, add sync queue with retry, restore deleted on sync, upload sent mails

- imap_delete_mail: use stored imap_uid instead of Message-ID search, raise on failure
- imap_move_mail: same imap_uid fix, raise on failure
- New MailSyncQueue model + migration 0007 for pending IMAP operations
- delete_mail route: queues failed IMAP delete for retry
- move_mail route: queues failed IMAP move for retry
- process_sync_queue: retries pending delete/move operations in auto-sync loop
- Auto-sync loop: processes sync queue before pulling new mails
- Restore soft-deleted mails if they still exist on IMAP server during sync
- Upload sent mails to IMAP Sent folder via APPEND after SMTP send
- Plugin version bumped to 1.2.0

app/plugins/builtins/mail/routes.py

@@ -31,6 +31,7 @@ from app.plugins.builtins.mail.models import (
     MailLabelAssignment,
     MailRule,
     MailSignature,
+    MailSyncQueue,
     MailTemplate,
     PgpKey,
 )
@@ -1531,12 +1532,22 @@ async def delete_mail(
     # Soft-delete: set deleted_at = now()
     mail.deleted_at = datetime.now(UTC)
     await db.flush()
-    # IMAP delete: non-critical, errors logged but DB soft-delete still succeeds
+    # IMAP delete: queue for retry if it fails
     try:
         await mail_services.imap_delete_mail(db, m_id, tenant_id)
     except Exception as exc:
         import logging
-        logging.getLogger(__name__).warning("IMAP delete failed for mail %s: %s", m_id, exc)
+        logging.getLogger(__name__).warning("IMAP delete failed for mail %s: %s, queuing for retry", m_id, exc)
+        queue_entry = MailSyncQueue(
+            tenant_id=tenant_id,
+            mail_id=m_id,
+            operation="delete",
+            payload={},
+            status="pending",
+            last_error=str(exc),
+        )
+        db.add(queue_entry)
+        await db.flush()
 
 
 @router.post("/{mail_id}/move")
@@ -1570,12 +1581,22 @@ async def move_mail(
     # Update mail.folder_id
     mail.folder_id = target_f_id
     await db.flush()
-    # IMAP move: non-critical
+    # IMAP move: queue for retry if it fails
     try:
         await mail_services.imap_move_mail(db, m_id, target_f_id, tenant_id)
     except Exception as exc:
         import logging
-        logging.getLogger(__name__).warning("IMAP move failed for mail %s: %s", m_id, exc)
+        logging.getLogger(__name__).warning("IMAP move failed for mail %s: %s, queuing for retry", m_id, exc)
+        queue_entry = MailSyncQueue(
+            tenant_id=tenant_id,
+            mail_id=m_id,
+            operation="move",
+            payload={"target_folder_id": str(target_f_id)},
+            status="pending",
+            last_error=str(exc),
+        )
+        db.add(queue_entry)
+        await db.flush()
     return mail_to_response(mail)