[bugfix] Fix refresh node definitions for subgraph nodes (#5222)

The refreshComboInNodes function was only iterating over top-level nodes,
missing nodes inside subgraphs. This caused file lists and combo widget
options to not update properly when new models were added, unless users
created completely new nodes.

Changes:
- Replace graph.nodes iteration with forEachNode() for hierarchical traversal
- Import forEachNode utility from graphTraversalUtil
- Change early continue to early return for callback function

Fixes #5196

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-authored-by: Claude <noreply@anthropic.com>

src/scripts/app.ts

@@ -63,6 +63,7 @@ import { ExtensionManager } from '@/types/extensionTypes'
 import type { NodeExecutionId } from '@/types/nodeIdentification'
 import { ColorAdjustOptions, adjustColor } from '@/utils/colorUtil'
 import { graphToPrompt } from '@/utils/executionUtil'
+import { forEachNode } from '@/utils/graphTraversalUtil'
 import {
   getNodeByExecutionId,
   triggerCallbackOnAllNodes
@@ -1700,12 +1701,13 @@ export class ComfyApp {
     for (const nodeId in defs) {
       this.registerNodeDef(nodeId, defs[nodeId])
     }
-    for (const node of this.graph.nodes) {
+    // Refresh combo widgets in all nodes including those in subgraphs
+    forEachNode(this.graph, (node) => {
       const def = defs[node.type]
       // Allow primitive nodes to handle refresh
       node.refreshComboInNode?.(defs)
 
-      if (!def?.input) continue
+      if (!def?.input) return
 
       if (node.widgets) {
         const nodeInputs = def.input
@@ -1732,7 +1734,7 @@ export class ComfyApp {
           }
         }
       }
-    }
+    })
 
     await useExtensionService().invokeExtensionsAsync(
       'refreshComboInNodes',