fix: re-extract Vue node data on slot label change for immediate rename

When a promoted widget is renamed via the sidebar, the
node:slot-label:changed event now triggers a full re-extraction of
Vue node data via extractVueNodeData, ensuring promotedLabel is
recomputed immediately instead of waiting for a subgraph navigation
round-trip.

src/composables/graph/useGraphNodeManager.ts

@@ -808,6 +808,8 @@ export function useGraphNodeManager(graph: LGraph): GraphNodeManager {
         if (slotLabelEvent.slotType !== NodeSlotType.INPUT && nodeRef.outputs) {
           nodeRef.outputs = [...nodeRef.outputs]
         }
+        // Re-extract widget data so promotedLabel reflects the rename
+        vueNodeData.set(nodeId, extractVueNodeData(nodeRef))
       }
     }