fix(workspace): restore theme design-system, fix 5x note creation, enforce privacy isolation, fix shared write permission, add drag-drop & slash-commands

internal/ws/hub.go

@@ -499,7 +499,9 @@ func (h *Hub) BroadcastTaskEvent(userID, event string, payload interface{}) {
 }
 
 func (h *Hub) BroadcastDocEvent(docID, event string, payload interface{}) {
-	h.BroadcastToAll(event, payload)
+	if docID != "" {
+		h.BroadcastRoom("doc:"+docID, event, payload, nil)
+	}
 }
 
 func (h *Hub) Broadcast(spaceID, listID, event string, payload interface{}) {