Add pricing badge when a subgraph contains partner nodes (#6354)

<img width="596" height="213" alt="image"
src="https://github.com/user-attachments/assets/174c5461-f638-42de-b3ad-0e108dee3983"
/>


![api-badge-subgraph_00003](https://github.com/user-attachments/assets/067d0398-47e9-4e97-9e1d-67fac2935e55)


┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6354-Add-pricing-badge-when-a-subgraph-contains-partner-nodes-29b6d73d365081c685bec3e9446970eb)
by [Unito](https://www.unito.io)

src/lib/litegraph/src/LGraph.ts

@@ -1710,6 +1710,14 @@ export class LGraph
 
     subgraphNode._setConcreteSlots()
     subgraphNode.arrange()
+    this.canvasAction((c) =>
+      c.canvas.dispatchEvent(
+        new CustomEvent('subgraph-converted', {
+          bubbles: true,
+          detail: { subgraphNode: subgraphNode as SubgraphNode }
+        })
+      )
+    )
     return { subgraph, node: subgraphNode as SubgraphNode }
   }
 

src/lib/litegraph/src/infrastructure/LGraphCanvasEventMap.ts

@@ -21,6 +21,11 @@ export interface LGraphCanvasEventMap {
     fromNode: SubgraphNode
   }
 
+  /** Dispatched after a group of items has been converted to a subgraph*/
+  'subgraph-converted': {
+    subgraphNode: SubgraphNode
+  }
+
   'litegraph:canvas':
     | { subType: 'before-change' | 'after-change' }
     | {