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/app/login/page.tsx

@@ -37,7 +37,7 @@ export default function LoginPage() {
           router.push('/')
         }
       }
-    } catch (error) {
+    } catch {
       setError('Une erreur est survenue')
     } finally {
       setIsLoading(false)