fix: display Blueprint badge instead of UUID for global subgraph blueprints (#9048)

## Problem

The node search box badge displays long UUID strings (e.g.,
`comfyui-ltx-video-0fbc55c6-...`) for global/core blueprints, while
user-created subgraphs correctly show "Blueprint" as the badge.


![image](https://github.com/user-attachments/assets/placeholder-before.png)

## Root Cause

In `loadGlobalBlueprint`, global blueprints set `python_module:
v.info.node_pack` which contains UUID-like strings. The
`getNodeSource()` function processes `python_module` to determine badge
text, but UUID strings don't match any known pattern, resulting in ugly
badge text.

## Solution

- Change global blueprints to use `python_module: 'blueprint'` so they
display "Blueprint" badge like user blueprints
- Add `isGlobal` boolean flag to `ComfyNodeDef` schema to distinguish
global from user blueprints
- Update `isGlobalBlueprint()` to check the new `isGlobal` flag instead
of `python_module !== 'blueprint'`

## Changes

| File | Change |
|------|--------|
| `src/schemas/nodeDefSchema.ts` | Add optional `isGlobal?: boolean`
field |
| `src/stores/nodeDefStore.ts` | Add `isGlobal` field to
`ComfyNodeDefImpl` class |
| `src/stores/subgraphStore.ts` | Use `python_module: 'blueprint'` +
`isGlobal: true` for global blueprints; update `isGlobalBlueprint()`
check |

## Testing

- [x] Existing unit tests pass
- [x] TypeScript compiles without errors
- [x] Lint passes

Fixes COM-15168

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9048-fix-display-Blueprint-badge-instead-of-UUID-for-global-subgraph-blueprints-30e6d73d3650813cac27e02f8f2088df)
by [Unito](https://www.unito.io)

src/stores/nodeDefStore.ts

@@ -89,6 +89,8 @@ export class ComfyNodeDefImpl
   readonly search_aliases?: string[]
   /** Category for the Essentials tab. If set, the node appears in Essentials. */
   readonly essentials_category?: string
+  /** Whether the blueprint is a global/installed blueprint (not user-created). */
+  readonly isGlobal?: boolean
 
   // V2 fields
   readonly inputs: Record<string, InputSpecV2>
@@ -165,6 +167,7 @@ export class ComfyNodeDefImpl
       obj.name,
       obj.essentials_category
     )
+    this.isGlobal = obj.isGlobal
 
     // Initialize V2 fields
     const defV2 = transformNodeDefV1ToV2(obj)