refactor(auth): optimize fetchUser with useCallback and remove unnece…

[24Victor]

This pull request includes changes to the resources/ts/hooks/useAuth.ts and resources/ts/layouts/AdminLayout.tsx files to improve code efficiency and readability. The most important changes include the addition of useCallback for memoization, and the removal of an unnecessary state variable.

Improvements to useAuth hook:

• resources/ts/hooks/useAuth.ts: Added useCallback to the fetchUser function for better performance by memoizing the function. [1] [2] [3]

Code cleanup in AdminLayout:

• resources/ts/layouts/AdminLayout.tsx: Removed the refreshKey state variable and its associated logic to simplify the component and avoid unnecessary re-renders. [1] [2] [3]…ssary state in AdminLayout