Initial commit: habit tracker PWA with Google OAuth, push notifications

FastAPI + SQLAlchemy/Alembic + MariaDB backend with Jinja2/htmx/Alpine
server-rendered frontend. Multi-user via Google OAuth, daily habit
tracking, monthly/weekly history views, Web Push reminders via
APScheduler, and PWA support (manifest, service worker, offline caching).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

tests/test_pages_today.py

@@ -0,0 +1,40 @@
+from app.models.habit import ALL_WEEKDAYS_MASK, HabitType
+from app.schemas.habit import HabitCreate
+from app.services import habit_service
+
+
+def _make_habit(db_session, user_id, name="아침 운동"):
+    data = HabitCreate(name=name, habit_type=HabitType.BUILD, weekdays_mask=ALL_WEEKDAYS_MASK)
+    return habit_service.create_habit(db_session, user_id, data)
+
+
+def test_today_page_redirects_to_login_when_not_authenticated(client):
+    response = client.get("/today", follow_redirects=False)
+    assert response.status_code == 303
+    assert response.headers["location"] == "/login"
+
+
+def test_today_page_shows_created_habit(auth_client, db_session, test_user):
+    _make_habit(db_session, test_user.id, name="아침 운동")
+
+    response = auth_client.get("/today")
+    assert response.status_code == 200
+    assert "아침 운동" in response.text
+
+
+def test_toggle_today_page_updates_checked_state(auth_client, db_session, test_user):
+    habit = _make_habit(db_session, test_user.id, name="아침 운동")
+
+    response = auth_client.post(f"/today/{habit.id}/toggle")
+    assert response.status_code == 200
+
+    # 서버가 실제로 로그를 남겼는지 today API로 재확인
+    today_items = auth_client.get("/api/today").json()
+    assert today_items[0]["checked"] is True
+
+
+def test_toggle_today_page_for_other_users_habit_returns_404(auth_client, db_session, other_user):
+    others_habit = _make_habit(db_session, other_user.id, name="남의 습관")
+
+    response = auth_client.post(f"/today/{others_habit.id}/toggle")
+    assert response.status_code == 404