## 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>
Rémi Delassus
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