Attach frontend version metadata on workflow export (#3386)

src/schemas/comfyWorkflowSchema.ts

@@ -224,6 +224,7 @@ const zConfig = z
 const zExtra = z
   .object({
     ds: zDS.optional(),
+    frontendVersion: z.string().optional(),
     linkExtensions: z.array(zComfyLinkExtension).optional(),
     reroutes: z.array(zReroute).optional()
   })

src/utils/executionUtil.ts

@@ -41,6 +41,8 @@ export const graphToPrompt = async (
   }
 
   compressWidgetInputSlots(workflow)
+  workflow.extra ??= {}
+  workflow.extra.frontendVersion = __COMFYUI_FRONTEND_VERSION__
 
   const output: ComfyApiWorkflow = {}
   // Process nodes in order of execution