Linted and formatted everything new

tests/conftest.py

@@ -4,16 +4,17 @@ Test configuration and fixtures for HXBooks.
 Provides isolated test database, Flask app instances, and CLI testing utilities.
 """
 
-import tempfile
+from collections.abc import Generator
 from pathlib import Path
-from typing import Generator
 
 import pytest
 from click.testing import CliRunner
 from flask import Flask
 from flask.testing import FlaskClient
+from sqlalchemy.orm import Session
 
-from hxbooks import cli, create_app
+from hxbooks import cli
+from hxbooks.app import create_app
 from hxbooks.db import db
 from hxbooks.models import User
 
@@ -64,7 +65,7 @@ def test_user(app: Flask) -> User:
 
 
 @pytest.fixture
-def db_session(app: Flask):
+def db_session(app: Flask) -> Generator[Session]:
     """Create database session for direct database testing."""
     with app.app_context():
         yield db.session