fix: resolve bookmark lookup for subgraph blueprints (#9057)

## Summary

Bookmarked subgraph blueprint nodes were not appearing in the favorites
tree because `buildBookmarkTree` looked up nodes only in
`nodeDefsByName`, which excludes subgraph blueprints.

## Changes

- **What**: Added `allNodeDefsByName` computed in `nodeDefStore` that
includes both regular nodes and subgraph blueprints. Updated
`nodeBookmarkStore.buildBookmarkTree` to use it for bookmark resolution.

## Review Focus

- `allNodeDefsByName` iterates over `nodeDefs` (which merges
`subgraphBlueprints` + `nodeDefsByName`). Confirm this doesn't introduce
performance concerns for large node sets.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9057-fix-resolve-bookmark-lookup-for-subgraph-blueprints-30e6d73d365081259bcae9d0c197de43)
by [Unito](https://www.unito.io)

src/stores/nodeDefStore.ts

@@ -371,6 +371,14 @@ export const useNodeDefStore = defineStore('nodeDef', () => {
     }
     return types
   })
+  const allNodeDefsByName = computed(() => {
+    const map: Record<string, ComfyNodeDefImpl> = {}
+    for (const nodeDef of nodeDefs.value) {
+      map[nodeDef.name] = nodeDef
+    }
+    return map
+  })
+
   const visibleNodeDefs = computed(() => {
     return nodeDefs.value.filter((nodeDef) =>
       nodeDefFilters.value.every((filter) => filter.predicate(nodeDef))
@@ -496,6 +504,7 @@ export const useNodeDefStore = defineStore('nodeDef', () => {
   return {
     nodeDefsByName,
     nodeDefsByDisplayName,
+    allNodeDefsByName,
     showDeprecated,
     showExperimental,
     showDevOnly,