feat: Sort received outgoing message down if it's fresher than all non fresh messages

Received messages shouldn't mingle with just sent ones and appear somewhere in the middle of the
chat, so we go after the newest non fresh message.

But if a received outgoing message is older than some `InSeen` message, better sort the received
message purely by timestamp (this is an heuristic in order not to break the Gmail-like case
simulated by `verified_chats::test_old_message_4()`). We could place the received message just
before that `InSeen` message, but anyway the user may not notice it.

At least this fixes outgoing messages sorting for shared accounts where messages from other devices
should be sorted the same way as incoming ones.

src/securejoin/bob.rs

@@ -73,8 +73,9 @@ pub(super) async fn start_protocol(context: &Context, invite: QrInvite) -> Resul
             // Calculate the sort timestamp before checking the chat protection status so that if we
             // race with its change, we don't add our message below the protection message.
             let sort_to_bottom = true;
+            let (received, incoming) = (false, false);
             let ts_sort = chat_id
-                .calc_sort_timestamp(context, 0, sort_to_bottom, false)
+                .calc_sort_timestamp(context, 0, sort_to_bottom, received, incoming)
                 .await?;
             if chat_id.is_protected(context).await? == ProtectionStatus::Unprotected {
                 let ts_start = time();