fix unread count: sent messages don't count as unread

Track outgoing messages separately (own counter) so they appear
in the log but don't inflate unread counts. Reset on recv.

Co-Developed-By: Kent Overstreet <kent.overstreet@linux.dev>

channels/irc/src/main.rs

@@ -544,7 +544,10 @@ impl channel_server::Server for ChannelServerImpl {
             } else {
                 format!("[PM:{}] {}", target, message)
             };
-            state.borrow_mut().push_message(log_line, 0, &channel);
+            state.borrow_mut().channel_logs
+                .entry(channel.clone())
+                .or_insert_with(ChannelLog::new)
+                .push_own(log_line);
 
             Ok(())
         })