feat: use dynamic axis labels in compass and trajectories UI

Replace hardcoded 'Links-Rechts' / 'Progressief-Conservatief' axis labels
with values from classify_axes(). Add per-year interpretation caption when
axis quality score is below the 0.65 correlation threshold.

explorer.py

@@ -199,6 +199,17 @@ def load_positions(
         normalize_vectors=True,
     )
 
+    try:
+        from analysis.axis_classifier import classify_axes
+
+        axis_def = classify_axes(positions_by_window, axis_def, db_path)
+    except Exception:
+        import logging
+
+        logging.getLogger(__name__).exception(
+            "classify_axes failed; using generic axis labels"
+        )
+
     # Filter displayed windows by window_size AFTER PCA computation.
     if window_size == "annual":
         annual_keys = set(w for w in all_available if "-Q" not in w)
@@ -831,6 +842,7 @@ def build_compass_tab(db_path: str, window_size: str) -> None:
 
     # Motion counts per year — sparse years get a warning label.
     _SPARSE_YEARS = {"2016", "2017", "2018"}
+    _THRESHOLD = 0.65
 
     def _window_label(w: str) -> str:
         if w == "current_parliament":
@@ -904,6 +916,9 @@ def build_compass_tab(db_path: str, window_size: str) -> None:
         st.info("Geen partijen met genoeg Kamerleden voor dit venster.")
         return
 
+    _x_label = axis_def.get("x_label", "Links\u2013Rechts")
+    _y_label = axis_def.get("y_label", "Progressief\u2013Conservatief")
+
     if level == "Partijen":
         # Aggregate to party centroids
         df_party = df_pos.groupby("party", as_index=False).agg(
@@ -924,8 +939,8 @@ def build_compass_tab(db_path: str, window_size: str) -> None:
             color_discrete_map=colour_map,
             title=f"Politiek Kompas — {_window_label(window_idx)} (partijen)",
             labels={
-                "x": "Links ← → Rechts",
-                "y": "Progressief / Conservatief",
+                "x": _x_label,
+                "y": _y_label,
                 "n": "Kamerleden",
             },
         )
@@ -943,7 +958,7 @@ def build_compass_tab(db_path: str, window_size: str) -> None:
             hover_data={"party": True, "x": ":.3f", "y": ":.3f"},
             color_discrete_map=colour_map,
             title=f"Politiek Kompas — {_window_label(window_idx)}",
-            labels={"x": "Links ← → Rechts", "y": "Progressief / Conservatief"},
+            labels={"x": _x_label, "y": _y_label},
         )
 
     fig.update_layout(
@@ -956,6 +971,18 @@ def build_compass_tab(db_path: str, window_size: str) -> None:
 
     with col1:
         st.plotly_chart(fig, use_container_width=True)
+        _x_interp = axis_def.get("x_interpretation", {}).get(window_idx, "")
+        _y_interp = axis_def.get("y_interpretation", {}).get(window_idx, "")
+        if (
+            _x_interp
+            and axis_def.get("x_quality", {}).get(window_idx, 1.0) < _THRESHOLD
+        ):
+            st.caption(_x_interp)
+        if (
+            _y_interp
+            and axis_def.get("y_quality", {}).get(window_idx, 1.0) < _THRESHOLD
+        ):
+            st.caption(_y_interp)
 
     # --- Voting discipline section ---
     _MIN_MOTIONS_FOR_DISCIPLINE = 5
@@ -1047,7 +1074,7 @@ def build_trajectories_tab(db_path: str, window_size: str) -> None:
     st.subheader("Partij Trajectories")
     st.markdown("Hoe bewegen partijen over de tijdsvensters heen?")
 
-    positions_by_window, _ = load_positions(db_path, window_size)
+    positions_by_window, axis_def = load_positions(db_path, window_size)
     if not positions_by_window:
         st.warning("Geen positiedata beschikbaar.")
         return
@@ -1117,8 +1144,8 @@ def build_trajectories_tab(db_path: str, window_size: str) -> None:
 
     fig.update_layout(
         title="Partij trajectories",
-        xaxis_title="Links ← → Rechts",
-        yaxis_title="Progressief / Conservatief",
+        xaxis_title=axis_def.get("x_label", "Links\u2013Rechts"),
+        yaxis_title=axis_def.get("y_label", "Progressief\u2013Conservatief"),
         height=600,
         legend_title_text="Partij",
     )