fix: use expect.poll for inner subgraph widget readiness in E2E test

Widgets on inner SubgraphNodes may be created lazily after navigation.
Poll until the inner node has widgets before proceeding, fixing CI flake.

browser_tests/tests/subgraphPromotion.spec.ts

@@ -654,26 +654,33 @@ test.describe(
         // Step 4: Find the inner subgraph node and its promoted widgets.
         // After wrapping, the inner node's seed promotion is preserved via
         // the SubgraphNode widgets getter as a PromotedWidgetView.
-        const innerInfo = await comfyPage.page.evaluate(() => {
-          const graph = window.app!.canvas.graph!
-          const subgraphNodes = graph.nodes.filter(
-            (n) => typeof n.isSubgraphNode === 'function' && n.isSubgraphNode()
-          )
-          if (subgraphNodes.length === 0)
-            throw new Error('No subgraph nodes found inside outer subgraph')
-          const node = subgraphNodes[0]
-          const widgetNames = (node.widgets ?? []).map((w) => w.name)
-          // The seed widget may appear under its original name or a
-          // display name assigned by the subgraph input slot.
-          const seedIdx = widgetNames.findIndex((n) => n.includes('seed'))
-          return {
-            nodeId: String(node.id),
-            widgetNames,
-            seedIndex: seedIdx >= 0 ? seedIdx : 0,
-            hasWidgets: widgetNames.length > 0
-          }
-        })
-        expect(innerInfo.hasWidgets).toBe(true)
+        // Widgets may be created lazily after navigation, so poll until ready.
+        const getInnerInfo = () =>
+          comfyPage.page.evaluate(() => {
+            const graph = window.app!.canvas.graph!
+            const subgraphNodes = graph.nodes.filter(
+              (n) =>
+                typeof n.isSubgraphNode === 'function' && n.isSubgraphNode()
+            )
+            if (subgraphNodes.length === 0) return null
+            const node = subgraphNodes[0]
+            const widgetNames = (node.widgets ?? []).map((w) => w.name)
+            if (widgetNames.length === 0) return null
+            const seedIdx = widgetNames.findIndex((n) => n.includes('seed'))
+            return {
+              nodeId: String(node.id),
+              widgetNames,
+              seedIndex: seedIdx >= 0 ? seedIdx : 0,
+              hasWidgets: widgetNames.length > 0
+            }
+          })
+        await expect
+          .poll(getInnerInfo, {
+            timeout: 5000,
+            message: 'Inner subgraph node should have widgets'
+          })
+          .toBeTruthy()
+        const innerInfo = (await getInnerInfo())!
 
         // Step 5: Right-click on a widget and promote it to the outer level
         const interiorNode = await comfyPage.nodeOps.getNodeRefById(