Adds getter for checking if a slot is unfillable

src/Battling/Models/BattleSide.hpp

@@ -78,6 +78,16 @@ namespace CreatureLib::Battling {
             }
         }
 
+        inline bool IsSlotUnfillabe(const ArbUt::BorrowedPtr<Creature>& creature) const noexcept {
+            for (u8 i = 0; i < _creaturesPerSide; i++) {
+                if (!_creatures[i].HasValue())
+                    continue;
+                if (_creatures[i].GetValue() == creature) {
+                    return _fillableSlots.At(i) l
+                }
+            }
+        }
+
         bool IsDefeated() noexcept {
             for (auto b : _fillableSlots) {
                 if (b)