[refactor] Use getSlotPosition for Vue nodes in link rendering (#5400)

* Remove COMFY_VUE_NODE_DIMENSIONS

* [refactor] Use getSlotPosition for Vue nodes in link rendering

Replace direct node position calls with getSlotPosition utility when Vue nodes mode is enabled. This ensures consistent slot positioning across the canvas rendering system.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Fix getSlotPosition readonly return value (#5433)

* Update accordingly to new type

* Fix canvas/screen conversion formulas in useTransformState (#5406)

* Fix conversion formulas

* update test expectations

* Remove unused type import

---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: filtered <176114999+webfiltered@users.noreply.github.com>

src/lib/litegraph/src/LGraphCanvas.ts

@@ -6,6 +6,7 @@ import {
   type LinkRenderContext,
   LitegraphLinkAdapter
 } from '@/renderer/core/canvas/litegraph/litegraphLinkAdapter'
+import { getSlotPosition } from '@/renderer/core/canvas/litegraph/slotCalculations'
 import { layoutStore } from '@/renderer/core/layout/store/layoutStore'
 
 import { CanvasPointer } from './CanvasPointer'
@@ -5559,7 +5560,9 @@ export class LGraphCanvas
         const link = graph._links.get(link_id)
         if (!link) continue
 
-        const endPos = node.getInputPos(i)
+        const endPos: Point = LiteGraph.vueNodesMode // TODO: still use LG get pos if vue nodes is off until stable
+          ? getSlotPosition(node, i, true)
+          : node.getInputPos(i)
 
         // find link info
         const start_node = graph.getNodeById(link.origin_id)
@@ -5569,7 +5572,9 @@ export class LGraphCanvas
         const startPos: Point =
           outputId === -1
             ? [start_node.pos[0] + 10, start_node.pos[1] + 10]
-            : start_node.getOutputPos(outputId)
+            : LiteGraph.vueNodesMode // TODO: still use LG get pos if vue nodes is off until stable
+              ? getSlotPosition(start_node, outputId, false)
+              : start_node.getOutputPos(outputId)
 
         const output = start_node.outputs[outputId]
         if (!output) continue

src/renderer/core/canvas/litegraph/slotCalculations.ts

@@ -9,8 +9,7 @@ import type { LGraphNode } from '@/lib/litegraph/src/LGraphNode'
 import type {
   INodeInputSlot,
   INodeOutputSlot,
-  Point,
-  ReadOnlyPoint
+  Point
 } from '@/lib/litegraph/src/interfaces'
 import { LiteGraph } from '@/lib/litegraph/src/litegraph'
 import { isWidgetInputSlot } from '@/lib/litegraph/src/node/slotUtils'
@@ -138,7 +137,7 @@ export function getSlotPosition(
   node: LGraphNode,
   slotIndex: number,
   isInput: boolean
-): ReadOnlyPoint {
+): Point {
   // Try to get precise position from slot layout (DOM-registered)
   const slotKey = getSlotKey(String(node.id), slotIndex, isInput)
   const slotLayout = layoutStore.getSlotLayout(slotKey)

src/renderer/core/layout/useTransformState.ts

@@ -74,6 +74,10 @@ export const useTransformState = () => {
 
   // Computed transform string for CSS
   const transformStyle = computed(() => ({
+    // Match LiteGraph DragAndScale.toCanvasContext():
+    // ctx.scale(scale); ctx.translate(offset)
+    // CSS applies right-to-left, so "scale() translate()" -> translate first, then scale
+    // Effective mapping: screen = (canvas + offset) * scale
     transform: `scale(${camera.z}) translate(${camera.x}px, ${camera.y}px)`,
     transformOrigin: '0 0'
   }))
@@ -103,15 +107,15 @@ export const useTransformState = () => {
    * Applies the same transform that LiteGraph uses for rendering.
    * Essential for positioning Vue components to align with canvas elements.
    *
-   * Formula: screen = canvas * scale + offset
+   * Formula: screen = (canvas + offset) * scale
    *
    * @param point - Point in canvas coordinate system
    * @returns Point in screen coordinate system
    */
   const canvasToScreen = (point: Point): Point => {
     return {
-      x: point.x * camera.z + camera.x,
-      y: point.y * camera.z + camera.y
+      x: (point.x + camera.x) * camera.z,
+      y: (point.y + camera.y) * camera.z
     }
   }
 
@@ -121,15 +125,15 @@ export const useTransformState = () => {
    * Inverse of canvasToScreen. Useful for hit testing and converting
    * mouse events back to canvas space.
    *
-   * Formula: canvas = (screen - offset) / scale
+   * Formula: canvas = screen / scale - offset
    *
    * @param point - Point in screen coordinate system
    * @returns Point in canvas coordinate system
    */
   const screenToCanvas = (point: Point): Point => {
     return {
-      x: (point.x - camera.x) / camera.z,
-      y: (point.y - camera.y) / camera.z
+      x: point.x / camera.z - camera.x,
+      y: point.y / camera.z - camera.y
     }
   }