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

backend/app/services/auth_service.py

@@ -39,7 +39,9 @@ async def get_user_by_id(db: AsyncSession, user_id: uuid.UUID) -> Optional[User]
     return result.scalar_one_or_none()
 
 
-async def authenticate_user(db: AsyncSession, email: str, password: str) -> Optional[User]:
+async def authenticate_user(
+    db: AsyncSession, email: str, password: str
+) -> Optional[User]:
     """Authenticate a user by email and password."""
     user = await get_user_by_email(db, email)
     if user is None:
@@ -67,6 +69,7 @@ def generate_token_pair(user: User) -> dict:
         lang=user.language,
     )
     from app.config import settings
+
     return {
         "access_token": access_token,
         "refresh_token": refresh_token,
@@ -135,10 +138,7 @@ async def list_users(
 
     offset = (page - 1) * page_size
     result = await db.execute(
-        select(User)
-        .order_by(User.created_at.desc())
-        .offset(offset)
-        .limit(page_size)
+        select(User).order_by(User.created_at.desc()).offset(offset).limit(page_size)
     )
     users = list(result.scalars().all())
     return users, total