fix: Vue Node <-> Litegraph node height offset normalization (#6966)

## Summary

Changes the layout store to treat node sizes as body-only measurements
while LiteGraph continues to reason about full heights. DOM-driven
updates are tagged with `LayoutSource.DOM`, which lets the store strip
the title height exactly once before persisting. That classification (a
new mutation source - `LayoutSource.DOM`) is accurate because those
mutations are triggered by the browser’s layout engine via
ResizeObserver, rather than by direct calls into the layout APIs (e.g.,
`moveNodeTo`, `useNodeDrag`). So all sources are:

- `LayoutSource.DOM`: browser layout/ResizeObserver measurements that
include the title bar
- `LayoutSource.Vue`: direct Vue-driven mutations routed through the
layout store
- `LayoutSource.Canvas`: legacy LiteGraph/canvas updates that will be
phased out over time
- `LayoutSource.External`: for multiplayer or syncing with a when going
online after making changes offline (in teams/workspace)

When layout state flows back into LiteGraph we add the title height just
in time for `liteNode.setSize`, so LiteGraph’s rendering stays
unchanged. This makes Vue node resizing and workflow persistence
deterministic - multiline widgets hold their dimensions across reloads
because every path that crosses the layout/LiteGraph boundary performs
the same normalization.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6966-normalize-height-at-sites-2b76d73d365081b6bcb4f4ce6a27663a)
by [Unito](https://www.unito.io)

---------

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

src/renderer/core/layout/store/layoutStore.ts

@@ -9,6 +9,8 @@ import { computed, customRef, ref } from 'vue'
 import type { ComputedRef, Ref } from 'vue'
 import * as Y from 'yjs'
 
+import { removeNodeTitleHeight } from '@/renderer/core/layout/utils/nodeSizeUtil'
+
 import { ACTOR_CONFIG } from '@/renderer/core/layout/constants'
 import { LayoutSource } from '@/renderer/core/layout/types'
 import type {
@@ -1414,8 +1416,8 @@ class LayoutStoreImpl implements LayoutStore {
   batchUpdateNodeBounds(updates: NodeBoundsUpdate[]): void {
     if (updates.length === 0) return
 
-    // Set source to Vue for these DOM-driven updates
     const originalSource = this.currentSource
+    const shouldNormalizeHeights = originalSource === LayoutSource.DOM
     this.currentSource = LayoutSource.Vue
 
     const nodeIds: NodeId[] = []
@@ -1426,8 +1428,15 @@ class LayoutStoreImpl implements LayoutStore {
       if (!ynode) continue
       const currentLayout = yNodeToLayout(ynode)
 
+      const normalizedBounds = shouldNormalizeHeights
+        ? {
+            ...bounds,
+            height: removeNodeTitleHeight(bounds.height)
+          }
+        : bounds
+
       boundsRecord[nodeId] = {
-        bounds,
+        bounds: normalizedBounds,
         previousBounds: currentLayout.bounds
       }
       nodeIds.push(nodeId)

src/renderer/core/layout/sync/useLayoutSync.ts

@@ -8,6 +8,7 @@ import { onUnmounted, ref } from 'vue'
 
 import type { useCanvasStore } from '@/renderer/core/canvas/canvasStore'
 import { layoutStore } from '@/renderer/core/layout/store/layoutStore'
+import { addNodeTitleHeight } from '@/renderer/core/layout/utils/nodeSizeUtil'
 
 /**
  * Composable for syncing LiteGraph with the Layout system
@@ -43,12 +44,13 @@ export function useLayoutSync() {
           liteNode.pos[1] = layout.position.y
         }
 
+        const targetHeight = addNodeTitleHeight(layout.size.height)
         if (
           liteNode.size[0] !== layout.size.width ||
-          liteNode.size[1] !== layout.size.height
+          liteNode.size[1] !== targetHeight
         ) {
           // Use setSize() to trigger onResize callback
-          liteNode.setSize([layout.size.width, layout.size.height])
+          liteNode.setSize([layout.size.width, targetHeight])
         }
       }
 

src/renderer/core/layout/types.ts

@@ -10,6 +10,7 @@ import type { ComputedRef, Ref } from 'vue'
 export enum LayoutSource {
   Canvas = 'canvas',
   Vue = 'vue',
+  DOM = 'dom',
   External = 'external'
 }
 

src/renderer/core/layout/utils/nodeSizeUtil.ts

@@ -0,0 +1,7 @@
+import { LiteGraph } from '@/lib/litegraph/src/litegraph'
+
+export const removeNodeTitleHeight = (height: number) =>
+  Math.max(0, height - (LiteGraph.NODE_TITLE_HEIGHT || 0))
+
+export const addNodeTitleHeight = (height: number) =>
+  height + LiteGraph.NODE_TITLE_HEIGHT

src/renderer/extensions/vueNodes/composables/useVueNodeResizeTracking.ts

@@ -107,7 +107,7 @@ const resizeObserver = new ResizeObserver((entries) => {
       x: topLeftCanvas.x,
       y: topLeftCanvas.y + LiteGraph.NODE_TITLE_HEIGHT,
       width: Math.max(0, width),
-      height: Math.max(0, height - LiteGraph.NODE_TITLE_HEIGHT)
+      height: Math.max(0, height)
     }
 
     let updates = updatesByType.get(elementType)
@@ -123,8 +123,7 @@ const resizeObserver = new ResizeObserver((entries) => {
     }
   }
 
-  // Set source to Vue before processing DOM-driven updates
-  layoutStore.setSource(LayoutSource.Vue)
+  layoutStore.setSource(LayoutSource.DOM)
 
   // Flush per-type
   for (const [type, updates] of updatesByType) {