fix: ruff lint + format fixes in tests, ESLint fixes in frontend

backend/app/routers/users.py

@@ -89,7 +89,9 @@ async def update_user(
     return UserResponse.model_validate(user)
 
 
-@router.delete("/{user_id}", response_model=UserResponse, status_code=status.HTTP_200_OK)
+@router.delete(
+    "/{user_id}", response_model=UserResponse, status_code=status.HTTP_200_OK
+)
 async def delete_user(
     user_id: uuid.UUID,
     db: AsyncSession = Depends(get_db),