fix: save first speaker log on meeting start

internal/timer/timer.go

@@ -105,11 +105,16 @@ func (t *Timer) Start() {
 	t.speakerWarned = false
 	t.meetingWarned = false
 
-	if len(t.queue) > 0 {
+	hasSpeakers := len(t.queue) > 0
+	if hasSpeakers {
 		t.startNextSpeaker(now, 0)
 	}
 	t.mu.Unlock()
 
+	if hasSpeakers {
+		t.emit(EventSpeakerChanged)
+	}
+
 	go t.tick()
 }