Als medewerker wil ik de rollen van een gebruiker kunnen wijzigen, zodat ik de rechten van een gebruiker kan aanpassen.

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No files or tests are mentioned. Start by finding the user administration screen and related user-role/authentication flow in the TypeScript front-end, then trace where user role data is fetched and updated. Locate the service/API layer used for saving user changes and update that flow so role edits from the UI are persisted. The issue is done when a staff user can successfully change a user’s role and the new permissions are reflected in the app behavior.

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