fix: prevent unnecessary user object updates causing infinite loops

Uses lodash-es isEqual for deep equality comparison to check if user
content has changed, preventing unnecessary state updates and infinite
loops in useEffect hooks.

Changes:
- Added lodash-es dependency for deep equality checking
- Updated GET_ACCESS_TOKEN_COMPLETE and HANDLE_REDIRECT_COMPLETE cases
- State only updates when user content actually changes

Fixes #787

Author: yogeshchoudhary147