Remove magic 10% scale on numeric widget step (#643)

There are external code still dependent on the fact that
Widget.options.step is scaled 10x, so the 10x-ed value is still kept
there, while we use the new unscaled step2 within our code now.

Ref:
https://cs.comfy.org/search?q=context:global+%22step+/+10%22&patternType=keyword&sm=0

src/utils/widget.ts

@@ -0,0 +1,10 @@
+import type { IWidgetOptions } from "@/types/widgets"
+
+/**
+ * The step value for numeric widgets.
+ * Use {@link IWidgetOptions.step2} if available, otherwise fallback to
+ * {@link IWidgetOptions.step} which is scaled up by 10x in the legacy frontend logic.
+ */
+export function getWidgetStep(options: IWidgetOptions<unknown>): number {
+  return options.step2 || ((options.step || 10) * 0.1)
+}