- Replaced the use of `useConvexClient` with `useQuery` for fetching the current user.
- Updated avatar URL retrieval to utilize the current user data from Better Auth.
- Refactored login and logout functions to use the new `authClient` methods for improved authentication flow.
- Cleaned up the component structure and styling for better readability and maintainability.
- Adjusted sidebar and footer styles for consistency with the new design system.
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