[backport core/1.42] fix: subgraph promoted widget input label rename (#10413)

Backport of #10195 to core/1.42.

Cherry-picked merge commit 657ae6a with conflict resolution in
`src/utils/widgetUtil.test.ts` (added missing mock imports for the new
`renameWidget` tests).

All other files applied cleanly.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-10413-backport-core-1-42-fix-subgraph-promoted-widget-input-label-rename-32d6d73d3650817fb524d220c340b758)
by [Unito](https://www.unito.io)

src/composables/graph/useGraphNodeManager.test.ts

@@ -197,14 +197,16 @@ describe('Widget slotMetadata reactivity on link disconnect', () => {
 
     const subgraphNode = createTestSubgraphNode(subgraph, { id: 123 })
 
-    // Create a PromotedWidgetView with displayName="value" (subgraph input
+    // Create a PromotedWidgetView with identityName="value" (subgraph input
     // slot name) and sourceWidgetName="prompt" (interior widget name).
-    // PromotedWidgetView.name returns "value", but safeWidgetMapper sets
-    // SafeWidgetData.name to sourceWidgetName ("prompt").
+    // PromotedWidgetView.name returns "value" (identity), safeWidgetMapper
+    // sets SafeWidgetData.name to sourceWidgetName ("prompt").
     const promotedView = createPromotedWidgetView(
       subgraphNode,
       '10',
       'prompt',
+      'value',
+      undefined,
       'value'
     )