Refactor auth flow and invite handling

[qisforq]

chore(auth):

This PR includes the following changes to improve the authentication flow and invite handling:

• refactor: move Jotai Provider to root layout

  • Fixes the multiple instances warning by moving the Jotai Provider to the root layout
  • Ensures a single source of truth for state management

• refactor: handle redirect URL logic inside AuthClient component

  • Consolidates the redirect logic inside the AuthClient component
  • Removes duplicate redirect logic from Login and Register pages
  • Updates AuthClient to use useRouter and redirectAtom state for improved navigation

• refactor: clean up unused imports and commented out code

  • Removes unused imports and commented out code to improve code readability and maintainability

• fix: update invite_id handling

  • Passes inviteId to handlePostSignIn in fetchUserData to ensure proper invite handling
  • Checks if the user is signed out to remove inviteId from local storage, preventing stale data
  • Adds inviteId as a dependency to fetchUserData useEffect in useUserData to trigger data fetching when inviteId changes

These changes aim to streamline the authentication flow, handle invite_id more robustly, and improve overall code quality and maintainability.