Add support for search aliases on subgraphs (#8608)

## Summary

- add commands for setting search aliases and description when in
subgraph
- in future we can add these fields to the dialog when publishing a
subgraph
- map workflow extra metadata on save/load from from/to subgraph node to
allow access via `canvas.subgraph.extra`

## Changes

**What**: 
- new core commands for Comfy.Subgraph.SetSearchAliases &
Comfy.Subgraph.SetDescription to be called when in a subgraph context
- update Publish command to allow command metadata arg for name
- update test executeCommand to allow passing metadata arg

## Review Focus

- When saving a subgraph, the outer workflow "wrapper" is created at the
point of publishing. So unlike a normal workflow `extra` property that
is available at any point, for a subgraph this is not accessible.
To workaround this, the `extra` property that exists on the inner
subgraph node is copied to the top level on save, and restored on load
so extra properties can be set via `canvas.subgraph.extra`.
- I have kept the existing naming format matching `BlueprintDescription`
for `BlueprintSearchAliases` but i'm not sure if the description was
ever used before

## Screenshots


https://github.com/user-attachments/assets/4d4df9c1-2281-4589-aa56-ab07cdecd353

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8608-Add-support-for-search-aliases-on-subgraphs-2fd6d73d365081d083caebd6befcacdd)
by [Unito](https://www.unito.io)


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Set subgraph search aliases (comma-separated) and descriptions;
aliases enable discovery by alternative names.
  * Publish subgraphs using a provided name.
* Node definitions now support search aliases so nodes can be found by
alternate names.
  * UI strings added for entering descriptions and search aliases.

* **Tests**
* Added end-to-end and unit tests covering aliases, descriptions, search
behavior, publishing, and persistence.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

src/composables/useCoreCommands.ts

@@ -171,8 +171,9 @@ export function useCoreCommands(): ComfyCommand[] {
       icon: 'pi pi-save',
       label: 'Publish Subgraph',
       menubarLabel: 'Publish',
-      function: async () => {
-        await useSubgraphStore().publishSubgraph()
+      function: async (metadata?: Record<string, unknown>) => {
+        const name = metadata?.name as string | undefined
+        await useSubgraphStore().publishSubgraph(name)
       }
     },
     {
@@ -1095,6 +1096,75 @@ export function useCoreCommands(): ComfyCommand[] {
         )
       }
     },
+    {
+      id: 'Comfy.Subgraph.SetDescription',
+      icon: 'pi pi-pencil',
+      label: 'Set Subgraph Description',
+      versionAdded: '1.39.7',
+      function: async (metadata?: Record<string, unknown>) => {
+        const canvas = canvasStore.getCanvas()
+        const subgraph = canvas.subgraph
+        if (!subgraph) return
+
+        const extra = (subgraph.extra ??= {}) as Record<string, unknown>
+        const currentDescription = (extra.BlueprintDescription as string) ?? ''
+
+        let description: string | null | undefined
+        const rawDescription = metadata?.description
+        if (rawDescription != null) {
+          description =
+            typeof rawDescription === 'string'
+              ? rawDescription
+              : String(rawDescription)
+        }
+        description ??= await dialogService.prompt({
+          title: t('g.description'),
+          message: t('subgraphStore.enterDescription'),
+          defaultValue: currentDescription
+        })
+        if (description === null) return
+
+        extra.BlueprintDescription = description.trim() || undefined
+        workflowStore.activeWorkflow?.changeTracker?.checkState()
+      }
+    },
+    {
+      id: 'Comfy.Subgraph.SetSearchAliases',
+      icon: 'pi pi-search',
+      label: 'Set Subgraph Search Aliases',
+      versionAdded: '1.39.7',
+      function: async (metadata?: Record<string, unknown>) => {
+        const canvas = canvasStore.getCanvas()
+        const subgraph = canvas.subgraph
+        if (!subgraph) return
+
+        const parseAliases = (value: unknown): string[] =>
+          (Array.isArray(value) ? value.map(String) : String(value).split(','))
+            .map((s) => s.trim())
+            .filter(Boolean)
+
+        const extra = (subgraph.extra ??= {}) as Record<string, unknown>
+
+        let aliases: string[]
+        const rawAliases = metadata?.aliases
+        if (rawAliases == null) {
+          const input = await dialogService.prompt({
+            title: t('subgraphStore.searchAliases'),
+            message: t('subgraphStore.enterSearchAliases'),
+            defaultValue: parseAliases(extra.BlueprintSearchAliases ?? '').join(
+              ', '
+            )
+          })
+          if (input === null) return
+          aliases = parseAliases(input)
+        } else {
+          aliases = parseAliases(rawAliases)
+        }
+
+        extra.BlueprintSearchAliases = aliases.length > 0 ? aliases : undefined
+        workflowStore.activeWorkflow?.changeTracker?.checkState()
+      }
+    },
     {
       id: 'Comfy.Dev.ShowModelSelector',
       icon: 'pi pi-box',