fix: prevent node height shrinking on vueNodes/litegraph mode switch (#8697)

## Summary
Three interacting bugs caused cumulative height loss (~66px per cycle):

1. useVueNodeLifecycle incorrectly subtracted NODE_TITLE_HEIGHT from
LGraphNode.size[1] during layout init, but size[1] is already
content-only (title excluded per LGraphNode.measure()).

2. ensureCorrectLayoutScale added/subtracted NODE_TITLE_HEIGHT in scale
formulas, breaking the round-trip.
Simplified to pure ratio scaling (size * scaleFactor). 
Also set LayoutSource.Canvas before batchUpdateNodeBounds to prevent
stale DOM source from triggering incorrect height normalization.

3. initSizeStyles set --node-height (min-height of the full DOM element
including title) to the content-only layout height.
Added NODE_TITLE_HEIGHT so ResizeObserver captures the correct total
height and normalization recovers the exact content height.

## Screenshots (if applicable)
before

https://github.com/user-attachments/assets/ae41124b-f9e3-4061-8127-eeacddc67a55

after

https://github.com/user-attachments/assets/5ff288a6-73a3-481a-a750-150d9bdbc8fe

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8697-fix-prevent-node-height-shrinking-on-vueNodes-litegraph-mode-switch-2ff6d73d365081c7a2acdc7ec57e2e19)
by [Unito](https://www.unito.io)

---------

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

browser_tests/tests/vueNodes/widgets/int/integerWidget.spec.ts

@@ -31,7 +31,12 @@ test.describe('Vue Integer Widget', () => {
     await expect(seedWidget).toBeVisible()
 
     // Delete the node that is linked to the slot (freeing up the widget)
-    await comfyPage.vueNodes.getNodeByTitle('Int').click()
+    // Click on the header to select the node (clicking center may land on
+    // the widget area where pointerdown.stop prevents node selection)
+    await comfyPage.vueNodes
+      .getNodeByTitle('Int')
+      .locator('.lg-node-header')
+      .click()
     await comfyPage.vueNodes.deleteSelected()
 
     // Test widget works when unlinked

src/composables/graph/useVueNodeLifecycle.ts

@@ -9,7 +9,6 @@ import { useCanvasStore } from '@/renderer/core/canvas/canvasStore'
 import { useLayoutMutations } from '@/renderer/core/layout/operations/layoutMutations'
 import { layoutStore } from '@/renderer/core/layout/store/layoutStore'
 import { useLayoutSync } from '@/renderer/core/layout/sync/useLayoutSync'
-import { removeNodeTitleHeight } from '@/renderer/core/layout/utils/nodeSizeUtil'
 import { ensureCorrectLayoutScale } from '@/renderer/extensions/vueNodes/layout/ensureCorrectLayoutScale'
 import { app as comfyApp } from '@/scripts/app'
 
@@ -33,10 +32,7 @@ function useVueNodeLifecycleIndividual() {
     const nodes = activeGraph._nodes.map((node: LGraphNode) => ({
       id: node.id.toString(),
       pos: [node.pos[0], node.pos[1]] as [number, number],
-      size: [node.size[0], removeNodeTitleHeight(node.size[1])] as [
-        number,
-        number
-      ]
+      size: [node.size[0], node.size[1]] as [number, number]
     }))
     layoutStore.initializeFromLiteGraph(nodes)
 

src/renderer/extensions/vueNodes/components/LGraphNode.test.ts

@@ -206,7 +206,7 @@ describe('LGraphNode', () => {
 
     expect(wrapper.element.style.getPropertyValue('--node-height')).toBe('')
     expect(wrapper.element.style.getPropertyValue('--node-height-x')).toBe(
-      '100px'
+      '130px'
     )
   })
 
@@ -219,7 +219,7 @@ describe('LGraphNode', () => {
     })
 
     expect(wrapper.element.style.getPropertyValue('--node-height')).toBe(
-      '100px'
+      '130px'
     )
     expect(wrapper.element.style.getPropertyValue('--node-height-x')).toBe('')
   })

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

@@ -342,7 +342,10 @@ function initSizeStyles() {
   const suffix = isCollapsed.value ? '-x' : ''
 
   el.style.setProperty(`--node-width${suffix}`, `${width}px`)
-  el.style.setProperty(`--node-height${suffix}`, `${height}px`)
+  el.style.setProperty(
+    `--node-height${suffix}`,
+    `${height + LiteGraph.NODE_TITLE_HEIGHT}px`
+  )
 }
 
 const baseResizeHandleClasses =

src/renderer/extensions/vueNodes/layout/ensureCorrectLayoutScale.ts

@@ -4,11 +4,11 @@ import { createBounds } from '@/lib/litegraph/src/measure'
 import { useSettingStore } from '@/platform/settings/settingStore'
 import { layoutStore } from '@/renderer/core/layout/store/layoutStore'
 import { useLayoutMutations } from '@/renderer/core/layout/operations/layoutMutations'
+import { LayoutSource } from '@/renderer/core/layout/types'
 import type { NodeBoundsUpdate } from '@/renderer/core/layout/types'
 import { app as comfyApp } from '@/scripts/app'
 import type { SubgraphInputNode } from '@/lib/litegraph/src/subgraph/SubgraphInputNode'
 import type { SubgraphOutputNode } from '@/lib/litegraph/src/subgraph/SubgraphOutputNode'
-import { LiteGraph } from '@/lib/litegraph/src/litegraph'
 
 const SCALE_FACTOR = 1.2
 
@@ -67,9 +67,7 @@ export function ensureCorrectLayoutScale(
 
     const scaledWidth = lgNode.width * scaleFactor
 
-    const scaledHeight = needsUpscale
-      ? lgNode.size[1] * scaleFactor + LiteGraph.NODE_TITLE_HEIGHT
-      : (lgNode.size[1] - LiteGraph.NODE_TITLE_HEIGHT) * scaleFactor
+    const scaledHeight = lgNode.size[1] * scaleFactor
 
     // Directly update LiteGraph node to ensure immediate consistency
     // Dont need to reference vue directly because the pos and dims are already in yjs
@@ -93,6 +91,7 @@ export function ensureCorrectLayoutScale(
   }
 
   if (onActiveGraph && yjsMoveNodeUpdates.length > 0) {
+    layoutStore.setSource(LayoutSource.Canvas)
     layoutStore.batchUpdateNodeBounds(yjsMoveNodeUpdates)
   }