Reset Fields widget implementation (#19283)

## Context
This PR implements the first steps for overridable entities resets.

<img width="1277" height="568" alt="Screenshot 2026-04-02 at 18 58 04"
src="https://github.com/user-attachments/assets/4c7f93b1-c453-4905-a919-cd6af11e0e16"
/>

packages/twenty-front/src/modules/page-layout/graphql/mutations/resetPageLayoutWidgetToDefault.ts

@@ -0,0 +1,12 @@
+import { gql } from '@apollo/client';
+
+import { PAGE_LAYOUT_WIDGET_FRAGMENT } from '@/page-layout/graphql/fragments/pageLayoutWidgetFragment';
+
+export const RESET_PAGE_LAYOUT_WIDGET_TO_DEFAULT = gql`
+  ${PAGE_LAYOUT_WIDGET_FRAGMENT}
+  mutation ResetPageLayoutWidgetToDefault($id: String!) {
+    resetPageLayoutWidgetToDefault(id: $id) {
+      ...PageLayoutWidgetFragment
+    }
+  }
+`;