fix: don't use registry when only checking for presence of missing nodes (#6965)

Changes the client-side validation of whether a graph has missing nodes
to use a simpler check (is the node name in the node defs from
`/object_info`), rather than using the Comfy Node Registry API
(api.comfy.org). The Registry API is still needed to get full
metadata/info about missing nodes, but that can be deferred until the
user actually needs that info.

This also fixes an issue where a node you coded yourself locally which
is neither a core node nor a node in the registry would be considered
"missing."

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6965-fix-don-t-use-registry-when-only-checking-for-presence-of-missing-nodes-2b76d73d365081e7b8fbcb3f2a1c4502)
by [Unito](https://www.unito.io)

src/workbench/extensions/manager/utils/graphHasMissingNodes.ts

@@ -0,0 +1,37 @@
+import { unref } from 'vue'
+import type { MaybeRef } from 'vue'
+
+import type {
+  LGraph,
+  LGraphNode,
+  Subgraph
+} from '@/lib/litegraph/src/litegraph'
+import type { ComfyNodeDefImpl } from '@/stores/nodeDefStore'
+import { collectAllNodes } from '@/utils/graphTraversalUtil'
+
+export type NodeDefLookup = Record<string, ComfyNodeDefImpl | undefined>
+
+const isNodeMissingDefinition = (
+  node: LGraphNode,
+  nodeDefsByName: NodeDefLookup
+) => {
+  const nodeName = node?.type
+  if (!nodeName) return false
+  return !nodeDefsByName[nodeName]
+}
+
+export const collectMissingNodes = (
+  graph: LGraph | Subgraph | null | undefined,
+  nodeDefsByName: MaybeRef<NodeDefLookup>
+): LGraphNode[] => {
+  if (!graph) return []
+  const lookup = unref(nodeDefsByName)
+  return collectAllNodes(graph, (node) => isNodeMissingDefinition(node, lookup))
+}
+
+export const graphHasMissingNodes = (
+  graph: LGraph | Subgraph | null | undefined,
+  nodeDefsByName: MaybeRef<NodeDefLookup>
+) => {
+  return collectMissingNodes(graph, nodeDefsByName).length > 0
+}