fix: better error logging and validation in weapon selector

- Add debug logging for skipped weapons
- Handle empty strings and 'null' values
- Verify all files use correct API attribute names

ui/weapon_selector.py

@@ -113,13 +113,22 @@ class WeaponSelectorDialog(QDialog):
                 try:
                     # Validate that decay and ammo are valid numbers
                     decay_val = w.decay if w.decay is not None else 0
+                    # NexusWeapon uses ammo_burn, not ammo
                     ammo_val = w.ammo_burn if w.ammo_burn is not None else 0
+                    
+                    # Additional validation - skip if values are empty strings or 'null'
+                    if decay_val == '' or decay_val == 'null':
+                        decay_val = 0
+                    if ammo_val == '' or ammo_val == 'null':
+                        ammo_val = 0
+                    
                     # Try to convert to Decimal to validate
                     Decimal(str(decay_val))
                     Decimal(str(ammo_val))
                     self._weapons.append(w)
-                except (InvalidOperation, ValueError, TypeError):
+                except (InvalidOperation, ValueError, TypeError) as e:
                     # Skip weapons with invalid data
+                    logger.debug(f"Skipping weapon {getattr(w, 'name', 'unknown')} due to invalid decay/ammo: {e}")
                     continue
             
             # Sort by name