Fix merge records page accumulating duplicate morph items (#17705)

## Why
When opening **Merge records** repeatedly, morph items for the same
command-menu page were appended instead of replaced. This could produce
duplicated IDs (e.g. `[A,B,B,A]`) in the merge flow and extra duplicate
tabs in the UI.

## What
- Update `useCommandMenuUpdateNavigationMorphItemsByPage` to replace
page morph items instead of appending existing ones.
- Add regression tests covering:
  - replacing existing morph items for the same page
  - keeping only the latest payload when called twice for the same page

## Notes
I could not run the full workspace tests locally in this environment
because of existing test/build setup issues unrelated to this change
(missing `packages/twenty-front/tsconfig.spec.json` and
`temporal-polyfill` resolution in dependent tasks).

Co-authored-by: remi <remi@labox-apps.com>

packages/twenty-front/src/modules/command-menu/hooks/__tests__/useCommandMenuUpdateNavigationMorphItemsByPage.test.tsx

@@ -0,0 +1,113 @@
+import { useCommandMenuUpdateNavigationMorphItemsByPage } from '@/command-menu/hooks/useCommandMenuUpdateNavigationMorphItemsByPage';
+import { commandMenuNavigationMorphItemsByPageState } from '@/command-menu/states/commandMenuNavigationMorphItemsByPageState';
+import { renderHook } from '@testing-library/react';
+import { act } from 'react';
+import { RecoilRoot, useRecoilValue } from 'recoil';
+
+const pageId = 'merge-page-id';
+const objectMetadataId = 'company-metadata-id';
+
+const Wrapper = ({
+  children,
+  initialRecordIds,
+}: {
+  children: React.ReactNode;
+  initialRecordIds: string[];
+}) => (
+  <RecoilRoot
+    initializeState={({ set }) => {
+      set(
+        commandMenuNavigationMorphItemsByPageState,
+        new Map([
+          [
+            pageId,
+            initialRecordIds.map((recordId) => ({
+              objectMetadataId,
+              recordId,
+            })),
+          ],
+        ]),
+      );
+    }}
+  >
+    {children}
+  </RecoilRoot>
+);
+
+const renderHooks = (initialRecordIds: string[]) =>
+  renderHook(
+    () => {
+      const { updateCommandMenuNavigationMorphItemsByPage } =
+        useCommandMenuUpdateNavigationMorphItemsByPage();
+      const commandMenuNavigationMorphItemsByPage = useRecoilValue(
+        commandMenuNavigationMorphItemsByPageState,
+      );
+
+      return {
+        updateCommandMenuNavigationMorphItemsByPage,
+        commandMenuNavigationMorphItemsByPage,
+      };
+    },
+    {
+      wrapper: ({ children }) => (
+        <Wrapper initialRecordIds={initialRecordIds}>{children}</Wrapper>
+      ),
+    },
+  );
+
+describe('useCommandMenuUpdateNavigationMorphItemsByPage', () => {
+  it('should replace existing items for a page instead of appending', async () => {
+    const { result } = renderHooks(['record-1', 'record-2']);
+
+    await act(async () => {
+      await result.current.updateCommandMenuNavigationMorphItemsByPage({
+        pageId,
+        objectMetadataId,
+        objectRecordIds: ['record-2', 'record-1'],
+      });
+    });
+
+    expect(
+      result.current.commandMenuNavigationMorphItemsByPage.get(pageId),
+    ).toEqual([
+      {
+        objectMetadataId,
+        recordId: 'record-2',
+      },
+      {
+        objectMetadataId,
+        recordId: 'record-1',
+      },
+    ]);
+  });
+
+  it('should keep only the latest payload when called twice for the same page', async () => {
+    const { result } = renderHooks([]);
+
+    await act(async () => {
+      await result.current.updateCommandMenuNavigationMorphItemsByPage({
+        pageId,
+        objectMetadataId,
+        objectRecordIds: ['record-1', 'record-2'],
+      });
+      await result.current.updateCommandMenuNavigationMorphItemsByPage({
+        pageId,
+        objectMetadataId,
+        objectRecordIds: ['record-2', 'record-1'],
+      });
+    });
+
+    expect(
+      result.current.commandMenuNavigationMorphItemsByPage.get(pageId),
+    ).toEqual([
+      {
+        objectMetadataId,
+        recordId: 'record-2',
+      },
+      {
+        objectMetadataId,
+        recordId: 'record-1',
+      },
+    ]);
+  });
+});

packages/twenty-front/src/modules/command-menu/hooks/useCommandMenuUpdateNavigationMorphItemsByPage.tsx

@@ -1,5 +1,4 @@
 import { commandMenuNavigationMorphItemsByPageState } from '@/command-menu/states/commandMenuNavigationMorphItemsByPageState';
-import { isNonEmptyArray } from '@sniptt/guards';
 import { useRecoilCallback } from 'recoil';
 
 type UpdateNavigationMorphItemsByPageParams = {
@@ -20,17 +19,10 @@ export const useCommandMenuUpdateNavigationMorphItemsByPage = () => {
           .getLoadable(commandMenuNavigationMorphItemsByPageState)
           .getValue();
 
-        const currentMorphItemsForPage = currentMorphItems.get(pageId);
-
-        const newMorphItems = [
-          ...(isNonEmptyArray(currentMorphItemsForPage)
-            ? currentMorphItemsForPage
-            : []),
-          ...objectRecordIds.map((recordId) => ({
-            objectMetadataId,
-            recordId,
-          })),
-        ];
+        const newMorphItems = objectRecordIds.map((recordId) => ({
+          objectMetadataId,
+          recordId,
+        }));
 
         const newMorphItemsMap = new Map(currentMorphItems);
         newMorphItemsMap.set(pageId, newMorphItems);