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

backend/tests/conftest.py

@@ -5,7 +5,6 @@ from typing import AsyncGenerator
 import pytest
 import pytest_asyncio
 from httpx import ASGITransport, AsyncClient
-from sqlalchemy import delete
 from sqlalchemy.ext.asyncio import (
     AsyncSession,
     async_sessionmaker,
@@ -26,6 +25,7 @@ TEST_DATABASE_URL = (
 def event_loop():
     """Create a fresh event loop per test for asyncpg compatibility."""
     import asyncio
+
     loop = asyncio.new_event_loop()
     yield loop
     loop.close()
@@ -117,6 +117,7 @@ async def inactive_user(db_session: AsyncSession) -> User:
 def _get_test_token(user: User) -> str:
     """Generate an access token for a test user."""
     from app.utils.jwt import create_access_token
+
     role_val = user.role.value if isinstance(user.role, UserRole) else str(user.role)
     return create_access_token(
         user_id=str(user.id),
@@ -141,6 +142,7 @@ async def verkaeufer_token(verkaeufer_user: User) -> str:
 @pytest_asyncio.fixture
 async def client(test_session_factory) -> AsyncGenerator[AsyncClient, None]:
     """Async HTTP test client with DB session override."""
+
     async def _override_get_db():
         async with test_session_factory() as session:
             try: