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

repositories/decision_repository.py

@@ -1,5 +1,5 @@
 """Repository for listing decisions (like/dislike)."""
-from datetime import datetime
+from datetime import datetime, UTC
 
 from models.decision import ListingDecision
 from sqlalchemy import Engine
@@ -24,7 +24,7 @@ class DecisionRepository:
             existing = session.exec(statement).first()
             if existing:
                 existing.decision = decision
-                existing.updated_at = datetime.utcnow()
+                existing.updated_at = datetime.now(UTC)
                 session.add(existing)
                 session.commit()
                 session.refresh(existing)