fix: streamline error handling and clean up unused imports

- Simplified error handling in `LoginPage` by removing the error parameter in the catch block.
- Removed unused import of `cn` in `KeyboardShortcutsModal` to clean up the code.
- Updated `UserPreferencesContext` to only destructure `status` from `useSession`, improving clarity.
- Refactored multiple methods in `UserPreferencesService` to eliminate unnecessary variable assignments, enhancing performance.
- Added ESLint directive to suppress unused variable warning for `NextAuth` import in type definitions.

src/components/ui/KeyboardShortcutsModal.tsx

@@ -1,7 +1,6 @@
 'use client';
 
 import { Modal } from './Modal';
-import { cn } from '@/lib/utils';
 
 interface KeyboardShortcut {
   keys: string[];