fix: correct _on_armor_changed to handle NexusArmorSet type

- NexusArmorSet.pieces is List[str], not Dict
- Removed code that tried to call .items() on the list
- Now simply clears current_armor_set when pieces are modified

ui/loadout_manager.py

@@ -2044,18 +2044,9 @@ class LoadoutManagerDialog(QDialog):
     def _on_armor_changed(self):
         """Handle armor piece or plate change."""
         # If individual pieces are changed, we're no longer using a pure full set
+        # Note: current_armor_set is a NexusArmorSet which has pieces as List[str]
+        # We can't easily check if pieces match, so just clear the set reference
         if self.current_armor_set:
-            # Check if all pieces match the set
-            all_match = True
-            for slot, piece in self.current_armor_set.pieces.items():
-                widget = self.slot_widgets.get(slot)
-                if widget:
-                    current = widget.get_piece()
-                    if not current or current.item_id != piece.item_id:
-                        all_match = False
-                        break
-
-            if not all_match:
             self.current_armor_set = None
 
         self._update_armor_summary()