Update pageLayout* data models for backend recordPageLayout refactor (#17446)

<img width="814" height="356" alt="Screenshot 2026-01-26 at 16 09 27"
src="https://github.com/user-attachments/assets/91d95a1d-cc33-4bf0-a63e-4d1815030983"
/>

packages/twenty-front/src/modules/page-layout/types/PageLayoutTab.ts

@@ -2,11 +2,14 @@ import { type PageLayoutTabLayoutMode } from '@/page-layout/types/PageLayoutTabL
 import { type PageLayoutWidget } from '@/page-layout/types/PageLayoutWidget';
 import { type PageLayoutTab as PageLayoutTabGenerated } from '~/generated/graphql';
 
-export type PageLayoutTab = Omit<PageLayoutTabGenerated, 'widgets'> & {
+export type PageLayoutTab = Omit<
+  PageLayoutTabGenerated,
+  'widgets' | 'layoutMode'
+> & {
   widgets: PageLayoutWidget[];
   /**
    * Only available behind IS_RECORD_PAGE_LAYOUT_ENABLED for now.
    */
   layoutMode?: PageLayoutTabLayoutMode;
-  icon?: string;
+  icon?: string | null;
 };

packages/twenty-front/src/modules/page-layout/utils/transformPageLayout.ts

@@ -9,11 +9,14 @@ export const transformPageLayout = (
     ...pageLayout,
     tabs: (pageLayout.tabs ?? [])
       .toSorted((a, b) => a.position - b.position)
-      .map(
-        (tab): PageLayoutTab => ({
-          ...tab,
+      .map((tab): PageLayoutTab => {
+        // TODO: remove this once the frontend consumes the new type
+        const { layoutMode: _layoutMode, ...tabWithoutLayoutMode } = tab;
+
+        return {
+          ...tabWithoutLayoutMode,
           widgets: tab.widgets ?? [],
-        }),
-      ),
+        };
+      }),
   };
 };