Fix tests to match decision service API and add filtering to non-streaming endpoint

- Update test mocks from _get_disliked_ids to _get_user_id_safe
- Fix decision service test method names (clear_decision -> remove_decision, etc.)
- Fix positional vs keyword arg assertion in set_decision test
- Add decision_filter param to non-streaming listing_geojson endpoint

tests/test_listing_geojson.py

@@ -108,7 +108,7 @@ class TestListingGeoJsonEndpoint:
     def mock_export(self):
         """Mock the export service."""
         with patch("api.app.export_service.export_to_geojson") as mock, \
-             patch("api.app._get_disliked_ids", return_value=set()):
+             patch("api.app._get_user_id_safe", return_value=None):
             mock.return_value = MagicMock(
                 data={"type": "FeatureCollection", "features": [{"type": "Feature"}]}
             )
@@ -175,7 +175,7 @@ class TestStreamingEndpoint:
     def mock_repository(self):
         """Mock the repository methods and bypass cache."""
         with patch("api.app.get_cached_count", return_value=None), \
-             patch("api.app._get_disliked_ids", return_value=set()), \
+             patch("api.app._get_user_id_safe", return_value=None), \
              patch("api.app.ListingRepository") as MockRepo:
             mock_instance = MagicMock()
             mock_instance.count_listings.return_value = 3