Move subgraph badge into node title (#6115)

<img width="1350" height="691" alt="image"
src="https://github.com/user-attachments/assets/4a1a909f-463e-4c77-8855-6fe0a177b659"
/>

Design docs show icon as being reversed in litegraph mode. If needed,
fixing this is basically just removing a negative sign.

LiteGraph implementation was not as clean as I hoped. I can spend some
more time divining some non-magic constants, and mayybe resolve the svg
data from css styles if desired.

Resolves #4647
Resolves #6107

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6115-Move-subgraph-badge-into-node-title-2906d73d365081e4ba82d321fc27afed)
by [Unito](https://www.unito.io)

---------

Co-authored-by: GitHub Action <action@github.com>

src/renderer/extensions/vueNodes/components/NodeHeader.vue

@@ -37,6 +37,7 @@
           </IconButton>
         </div>
 
+        <div v-if="isSubgraphNode" class="icon-[comfy--workflow] size-4" />
         <!-- Node Title -->
         <div
           v-tooltip.top="tooltipConfig"