Disable number grouping (thousands comma separators) by default in Vue node number widgets (#5776)

## Summary

Makes the
[useGrouping](https://primevue.org/inputnumber/#api.inputnumber.props.useGrouping)
prop for number widgets disabled by default, aligning with the old UI
(also requested via design). Node authors can still enable if they want
by setting prop explicitly.

## Changes

- **What**: Modified
[WidgetInputNumberInput](https://primevue.org/inputnumber/) to disable
`useGrouping` by default, requiring explicit opt-in via widget options
- **Testing**: Added component tests covering value binding, component
rendering, step calculations, and grouping behavior

## Review Focus

UX impact on existing nodes that may have relied on default grouping
behavior and test coverage for edge cases with precision calculations.

## Screenshots (if applicable)

*Before*:

<img width="1685" height="879" alt="Screenshot from 2025-09-25 11-34-34"
src="https://github.com/user-attachments/assets/432097ab-203d-4f86-8ca0-721b27ee33de"
/>

*After*:

<img width="1951" height="1175" alt="Screenshot from 2025-09-25
11-35-27"
src="https://github.com/user-attachments/assets/74d35b62-612e-4dbf-b6e2-0ac17af03ea1"
/>


┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5776-Disable-number-grouping-thousands-comma-separators-by-default-in-Vue-node-number-widget-2796d73d365081369ca6c155335d0d57)
by [Unito](https://www.unito.io)

---------

Co-authored-by: DrJKL <448862+DrJKL@users.noreply.github.com>
Co-authored-by: Alexander Brown <drjkl@comfy.org>
Co-authored-by: github-actions <github-actions@github.com>

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

@@ -48,6 +48,11 @@ const stepValue = computed(() => {
   // Default to 'any' for unrestricted stepping
   return 0
 })
+
+// Disable grouping separators by default unless explicitly enabled by the node author
+const useGrouping = computed(() => {
+  return props.widget.options?.useGrouping === true
+})
 </script>
 
 <template>
@@ -60,6 +65,7 @@ const stepValue = computed(() => {
       size="small"
       :disabled="readonly"
       :step="stepValue"
+      :use-grouping="useGrouping"
       :class="cn(WidgetInputBaseClass, 'w-full text-xs')"
       :pt="{
         incrementButton: