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
-     vectors for a window and project each MP onto it.  The sign is arbitrary
-     but consistent within a window.
+ 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
+    but consistent within a window.
 
-  2. Anchor mode: define the axis as the vector from the centroid of
-     ``left_parties`` to the centroid of ``right_parties``.  Project all MPs
-     onto this normalised anchor axis.
+ 2. Anchor mode: define the axis as the vector from the centroid of
+    ``left_parties`` to the centroid of ``right_parties``.  Project all MPs
+    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.
-        right_parties = {
-            "PVV",
-            "VVD",
-            "FVD",
-            "BBB",
-            "JA21",
-            "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",
-        }
+        # Use CANONICAL_LEFT/RIGHT from config for consistency with SVD components tab.
+        # X-axis: CANONICAL_RIGHT (right) vs CANONICAL_LEFT (left)
+        # Y-axis: CANONICAL_LEFT (progressive) vs cons_parties (conservative)
+        right_parties = CANONICAL_RIGHT
+        left_parties = CANONICAL_LEFT
+        cons_parties = CANONICAL_RIGHT  # Conservative = right-leaning parties
+        prog_parties = CANONICAL_LEFT  # Progressive = left-leaning parties
 
         # Ensure consistent left/right and progressive/conservative orientation
         # by checking canonical party centroids and flipping axis signs if needed.