Fix/vue nodes auto scale (#6664)

## Summary

**Problem:** ensureCorrectLayoutScale scales up LG -> Vue. But doesn't
scale down from Vue -> LG.

**Solution:** Bi directional scaling.

**Bonus:** fix edge cases such as subgraphs, groups, and reroutes. Also,
set auto scale: true now that we 'preserve' LG scale.

**IMPORTANT:** useVueNodeResizeTracking.ts sets vue node height -
Litegraph.NODE_TITLE_HEIGHT on workflow load using a resize observer.
Reloading the page (loading a workflow) in Vue mode, will subtract
height each time. This can look like a problem caused by
ensureCorrectLayoutScale. It is not. Need to fix. Here was an attempt by
[removing the Litegraph.NODE_TITLE_HEIGHT
entirely](https://github.com/Comfy-Org/ComfyUI_frontend/pull/6643).

## Review Focus

Full lifecycle of loading workflows and switching between vue and lg.
Race conditions could be present. For example switching the mode using
keybind very fast.

## Screenshots (if applicable)


https://github.com/user-attachments/assets/5576b760-13a8-45b9-b8f7-64e1caf443c1



https://github.com/user-attachments/assets/46d6f870-df76-4084-968a-53cb629fc123

---------

Co-authored-by: github-actions <github-actions@github.com>

src/lib/litegraph/src/LGraph.ts

@@ -79,6 +79,8 @@ export type {
   LGraphTriggerParam
 } from './types/graphTriggers'
 
+export type rendererType = 'LG' | 'Vue'
+
 export interface LGraphState {
   lastGroupId: number
   lastNodeId: number
@@ -104,6 +106,7 @@ export interface LGraphExtra extends Dictionary<unknown> {
   reroutes?: SerialisableReroute[]
   linkExtensions?: { id: number; parentId: number | undefined }[]
   ds?: DragAndScaleState
+  workflowRendererVersion?: rendererType
 }
 
 export interface BaseLGraph {