fix: Improve legacy widget compatibility in vueNodes mode (#7766)

## Summary
- Fix widget callback signature to pass node as 3rd parameter for
extensions like Impact Pack
- Add triggerDraw call to update all legacy widgets when any widget
value changes
- Support computeLayoutSize for dynamic widget height calculation
- Set node.canvasHeight for extensions that rely on this property
- Use step/10 for number input buttons to match litegraph behavior

Fixes display and interaction issues with Impact Pack's Mask Rect Area
nodes.

fix https://github.com/Comfy-Org/ComfyUI_frontend/issues/7615 and
https://github.com/Comfy-Org/ComfyUI_frontend/issues/7616

it also requires Impact pack PR
https://github.com/ltdrdata/ComfyUI-Impact-Pack/pull/1167

## Screenshots
Before


https://github.com/user-attachments/assets/eb890f7c-c1a0-4c7b-a8d7-dde304de83e4


After


https://github.com/user-attachments/assets/dad65b52-d71e-4c19-92c0-367b7dcafed0

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7766-fix-Improve-legacy-widget-compatibility-in-vueNodes-mode-2d56d73d365081b18d83f4a41ff0f377)
by [Unito](https://www.unito.io)

src/renderer/extensions/vueNodes/widgets/components/WidgetInputNumberInput.vue

@@ -31,10 +31,17 @@ const precision = computed(() => {
 
 // Calculate the step value based on precision or widget options
 const stepValue = computed(() => {
-  // Use step2 (correct input spec value) instead of step (legacy 10x value)
+  // Use step2 (correct input spec value) if available
   if (props.widget.options?.step2 !== undefined) {
     return Number(props.widget.options.step2)
   }
+  // Use step / 10 for custom large step values (> 10) to match litegraph behavior
+  // This is important for extensions like Impact Pack that use custom step values (e.g., 640)
+  // We skip default step values (1, 10) to avoid affecting normal widgets
+  const step = props.widget.options?.step
+  if (step !== undefined && step > 10) {
+    return Number(step) / 10
+  }
   // Otherwise, derive from precision
   if (precision.value !== undefined) {
     if (precision.value === 0) {