fix: QA fixes for property decisions feature

- Replace deprecated datetime.utcnow() with datetime.now(UTC) in model
  and repository
- Add listing_type validation to decision_service (RENT/BUY only)
- Fix decision filtering tests failing due to rate limiting by patching
  _match_endpoint
- Add SwipeCard component test suite (11 tests covering rendering,
  interactions, and POI distances)
- Add test for invalid listing_type validation

tests/unit/test_decision_filtering.py

@@ -1,6 +1,7 @@
 """Test that disliked listings are filtered from the GeoJSON endpoint."""
 import pytest
 from datetime import datetime
+from unittest.mock import patch
 from httpx import ASGITransport, AsyncClient
 from sqlalchemy import Engine
 from sqlmodel import SQLModel, Session, create_engine
@@ -73,8 +74,9 @@ async def filter_client(filter_engine: Engine) -> AsyncClient:
     poi_routes_mod.engine = filter_engine
 
     transport = ASGITransport(app=app)
-    async with AsyncClient(transport=transport, base_url="http://test") as c:
-        yield c  # type: ignore[misc]
+    with patch("api.rate_limiter._match_endpoint", return_value=None):
+        async with AsyncClient(transport=transport, base_url="http://test") as c:
+            yield c  # type: ignore[misc]
 
     database.engine = original_db
     api_app.engine = original_app

tests/unit/test_decision_service.py

@@ -40,6 +40,14 @@ class TestSetDecision:
                 listing_type="RENT", decision="maybe",
             )
 
+    def test_invalid_listing_type_raises(self) -> None:
+        repo = MagicMock()
+        with pytest.raises(ValueError, match="Invalid listing_type"):
+            decision_service.set_decision(
+                repo, user_id=1, listing_id=100,
+                listing_type="SELL", decision="liked",
+            )
+
 
 class TestGetDecisions:
     def test_returns_all_decisions(self) -> None: