fix: use CANONICAL_LEFT/RIGHT in compass PCA for consistency with SVD components tab

Previously the compass (political_axis.py) used hardcoded party sets that
excluded Volt and PvdD, while the SVD components tab (svd_labels.py) used
CANONICAL_LEFT/RIGHT which includes them. This caused inconsistencies in
axis orientation where Volt appeared most left on the compass but PvdD
appeared most left in the SVD components visualization.

Changes:
- Import CANONICAL_LEFT/RIGHT from config in political_axis.py
- Replace hardcoded party sets with CANONICAL_LEFT/RIGHT for axis orientation
- Update tests to match new SVD_THEMES labels

analysis/political_axis.py

@@ -1,13 +1,13 @@
 """political_axis.py — Project MP SVD vectors onto an ideological axis.
 
 Two modes:
-  1. PCA mode (default): compute the first principal component of all MP SVD
+ 1. PCA mode (default): compute the first principal component of all MP SVD
-     vectors for a window and project each MP onto it.  The sign is arbitrary
+    vectors for a window and project each MP onto it.  The sign is arbitrary
-     but consistent within a window.
+    but consistent within a window.
 
-  2. Anchor mode: define the axis as the vector from the centroid of
+ 2. Anchor mode: define the axis as the vector from the centroid of
-     ``left_parties`` to the centroid of ``right_parties``.  Project all MPs
+    ``left_parties`` to the centroid of ``right_parties``.  Project all MPs
-     onto this normalised anchor axis.
+    onto this normalised anchor axis.
 
 Both modes return a dict mapping mp_name → scalar score for the given window.
 """
@@ -24,6 +24,13 @@ try:
 except Exception:  # pragma: no cover - allow importing module in lightweight test envs
     duckdb = None  # type: ignore
 
+# Import canonical party sets from config for consistent orientation with SVD components tab
+try:
+    from .config import CANONICAL_LEFT, CANONICAL_RIGHT
+except Exception:  # pragma: no cover - fallback for test environments
+    CANONICAL_LEFT: frozenset = frozenset()
+    CANONICAL_RIGHT: frozenset = frozenset()
+
 _logger = logging.getLogger(__name__)
 
 
@@ -262,35 +269,13 @@ def compute_2d_axes(
         }
 
         # Canonical party sets used for axis orientation (global and per-window).
-        # Defined outside the try-block so they're always in scope.
+        # Use CANONICAL_LEFT/RIGHT from config for consistency with SVD components tab.
-        right_parties = {
+        # X-axis: CANONICAL_RIGHT (right) vs CANONICAL_LEFT (left)
-            "PVV",
+        # Y-axis: CANONICAL_LEFT (progressive) vs cons_parties (conservative)
-            "VVD",
+        right_parties = CANONICAL_RIGHT
-            "FVD",
+        left_parties = CANONICAL_LEFT
-            "BBB",
+        cons_parties = CANONICAL_RIGHT  # Conservative = right-leaning parties
-            "JA21",
+        prog_parties = CANONICAL_LEFT  # Progressive = left-leaning parties
-            "Nieuw Sociaal Contract",
-        }
-        left_parties = {"SP", "PvdA", "GL", "GroenLinks", "GroenLinks-PvdA", "DENK"}
-        cons_parties = {
-            "PVV",
-            "VVD",
-            "FVD",
-            "CDA",
-            "SGP",
-            "BBB",
-            "JA21",
-            "Nieuw Sociaal Contract",
-        }
-        prog_parties = {
-            "GL",
-            "GroenLinks",
-            "PvdA",
-            "PvdD",
-            "SP",
-            "GroenLinks-PvdA",
-            "DENK",
-        }
 
         # Ensure consistent left/right and progressive/conservative orientation
         # by checking canonical party centroids and flipping axis signs if needed.

tests/test_axis_label_fallback.py

@@ -10,8 +10,12 @@ def test_display_label_for_modal():
     y_label = axis_classifier.display_label_for_modal(None, "y")
 
     # Should return component 1 and 2 labels from SVD_THEMES
-    assert "Rechts versus links" in x_label or "links" in x_label.lower()
+    # SVD_THEMES[0] = "Economische sectorbelangen versus sociale welvaart"
-    assert "Nationalistisch" in y_label or "kosmopolitisch" in y_label
+    # SVD_THEMES[1] = "Nationalistische versus multilateralistische oriëntatie"
+    assert (
+        "Economische sectorbelangen" in x_label or "sectorbelangen" in x_label.lower()
+    )
+    assert "Nationalistisch" in y_label or "nationalistisch" in y_label.lower()
 
 
 def test_display_label_for_modal_maps_as_labels():
@@ -19,9 +23,11 @@ def test_display_label_for_modal_maps_as_labels():
     x_label = axis_classifier.display_label_for_modal("As 1", "x")
     y_label = axis_classifier.display_label_for_modal("As 2", "y")
 
-    # Should return component 1 and 2 labels
+    # Should return component 1 and 2 labels from SVD_THEMES
-    assert "Rechts versus links" in x_label or "links" in x_label.lower()
+    assert (
-    assert "Nationalistisch" in y_label or "kosmopolitisch" in y_label
+        "Economische sectorbelangen" in x_label or "sectorbelangen" in x_label.lower()
+    )
+    assert "Nationalistisch" in y_label or "nationalistisch" in y_label.lower()
 
 
 def test_display_label_for_modal_stempatroon():
@@ -29,9 +35,11 @@ def test_display_label_for_modal_stempatroon():
     x_label = axis_classifier.display_label_for_modal("Stempatroon As 1", "x")
     y_label = axis_classifier.display_label_for_modal("Stempatroon As 2", "y")
 
-    # Should return component 1 and 2 labels
+    # Should return component 1 and 2 labels from SVD_THEMES
-    assert "Rechts versus links" in x_label or "links" in x_label.lower()
+    assert (
-    assert "Nationalistisch" in y_label or "kosmopolitisch" in y_label
+        "Economische sectorbelangen" in x_label or "sectorbelangen" in x_label.lower()
+    )
+    assert "Nationalistisch" in y_label or "nationalistisch" in y_label.lower()
 
 
 def test_classify_axes_modal_fallback(monkeypatch, tmp_path):
@@ -82,12 +90,12 @@ def test_classify_axes_modal_fallback(monkeypatch, tmp_path):
     if not enriched or not isinstance(enriched, dict):
         pytest.skip("classify_axes returned no enrichment in this environment")
 
-    # Should now return SVD component labels instead of hardcoded values
+    # Should now return SVD component labels from SVD_THEMES
     assert (
-        "Rechts versus links" in enriched["x_label"]
+        "Economische sectorbelangen" in enriched["x_label"]
-        or "links" in enriched["x_label"].lower()
+        or "sectorbelangen" in enriched["x_label"].lower()
     )
     assert (
         "Nationalistisch" in enriched["y_label"]
-        or "kosmopolitisch" in enriched["y_label"]
+        or "nationalistisch" in enriched["y_label"].lower()
     )

tests/test_svd_labels.py

@@ -78,17 +78,17 @@ def test_get_svd_label_returns_correct_label():
     """Test that get_svd_label returns the correct label for each component."""
     from analysis.svd_labels import get_svd_label
 
-    # Component 1 should return Rechts versus links label
+    # Component 1 should return "Economische sectorbelangen versus sociale welvaart"
     label1 = get_svd_label(1)
-    assert "Rechts versus links" in label1 or "links" in label1.lower()
+    assert "Economische sectorbelangen" in label1 or "sectorbelangen" in label1.lower()
 
-    # Component 2 should return Nationalistisch versus kosmopolitisch label
+    # Component 2 should return "Nationalistische versus multilateralistische oriëntatie"
     label2 = get_svd_label(2)
-    assert "Nationalistisch" in label2 or "kosmopolitisch" in label2
+    assert "Nationalistisch" in label2 or "nationalistisch" in label2.lower()
 
-    # Component 3 should return Verzorgingsstaat label
+    # Component 3 should return "Verzorgingsstaat versus defensie en nationale veiligheid"
     label3 = get_svd_label(3)
-    assert "Verzorgingsstaat" in label3 or "Marktwerking" in label3
+    assert "Verzorgingsstaat" in label3 or "verzorgingsstaat" in label3.lower()
 
 
 def test_compute_flip_direction_right_on_left():