V0.7.0 shell contract (#54)

server/handlers/notifications.go

@@ -137,10 +137,9 @@ func (h *NotificationHandler) MarkAllRead(c *gin.Context) {
 
 	// Sync badge across tabs
 	if h.hub != nil {
-		payload, _ := json.Marshal(map[string]string{"action": "mark_all_read"})
 		h.hub.PublishToUser(userID, events.Event{
-			Label:   "notification.read",
-			Payload: payload,
+			Label:   "notification.all_read",
+			Payload: events.MustJSON(map[string]string{}),
 			Ts:      time.Now().UnixMilli(),
 		})
 	}