fix(explorer): normalise party name 'Nieuw Sociaal Contract' -> 'NSC'

explorer.py

@@ -64,7 +64,6 @@ KNOWN_MAJOR_PARTIES = [
     "CDA",
     "SP",
     "NSC",
-    "Nieuw Sociaal Contract",
     "CU",
     "BBB",
 ]
@@ -165,11 +164,16 @@ def load_positions(
 
 @st.cache_data(show_spinner="Partijkaart laden…")
 def load_party_map(db_path: str) -> Dict[str, str]:
-    """Return {mp_name: party} mapping from mp_metadata (with vote-based fallback)."""
+    """Return {mp_name: party} mapping, with party names normalised to abbreviations."""
     from analysis.visualize import _load_party_map
 
+    _PARTY_ALIASES: Dict[str, str] = {
+        "Nieuw Sociaal Contract": "NSC",
+    }
+
     try:
-        return _load_party_map(db_path)
+        raw = _load_party_map(db_path)
+        return {mp: _PARTY_ALIASES.get(party, party) for mp, party in raw.items()}
     except Exception:
         logger.exception("Failed to load party map")
         return {}