feat(compass): switch to annual SVD windows by default

- load_positions annual mode now selects actual annual window_ids
  ('2022', '2023', etc.) instead of Q4 quarterly approximations,
  with current_parliament appended as the most-recent anchor
- Sidebar radio defaults to 'Per jaar' (annual) instead of quarterly
- Dutch labels for window size radio: 'Per jaar' / 'Per kwartaal'

explorer.py

@@ -172,8 +172,14 @@ def load_positions(
     # Mixed-dim windows cause np.vstack to fail in compute_2d_axes.
     available = get_uniform_dim_windows(db_path)
     if window_size == "annual":
-        # Keep only Q4 windows (one representative window per year)
-        available = [w for w in available if w.endswith("-Q4")]
+        # Use actual annual windows (no "-Q" suffix, not "current_parliament").
+        # These are window_ids like "2022", "2023", etc. computed over full calendar years.
+        # Always include current_parliament as the most-recent anchor.
+        annual = [w for w in available if "-Q" not in w and w != "current_parliament"]
+        # Sort so current_parliament comes last (after all year windows)
+        available = sorted(annual) + (
+            ["current_parliament"] if "current_parliament" in available else []
+        )
 
     if not available:
         return {}, {}
@@ -1442,7 +1448,12 @@ def run_app() -> None:
     # Sidebar
     st.sidebar.title("Instellingen")
     db_path = st.sidebar.text_input("DuckDB pad", value="data/motions.db")
-    window_size = st.sidebar.radio("Venstergrootte", ["quarterly", "annual"], index=0)
+    window_size = st.sidebar.radio(
+        "Venstergrootte",
+        options=["annual", "quarterly"],
+        format_func=lambda x: "Per jaar" if x == "annual" else "Per kwartaal",
+        index=0,
+    )
     show_rejected = st.sidebar.checkbox("Toon verworpen moties", value=False)
 
     # About section