anim: fix creature animation not updating on swim/fly state transitions

Previously, the animation update for other entities (creatures, players)
was only triggered when the moving/idle state changed. This meant a
creature landing while still moving would stay in FlyForward instead of
switching to Run, and a flying-idle creature touching down would keep
the FlyIdle animation instead of returning to Stand.

Fix: track creatureWasSwimming_ and creatureWasFlying_ alongside
creatureWasMoving_, and fire the animation update whenever any of the
three locomotion flags change. Clean up the new maps on world reset and
on per-creature despawn.

include/core/application.hpp

@@ -187,7 +187,9 @@ private:
     std::unordered_map<uint64_t, uint32_t> creatureInstances_;  // guid → render instanceId
     std::unordered_map<uint64_t, uint32_t> creatureModelIds_;   // guid → loaded modelId
     std::unordered_map<uint64_t, glm::vec3> creatureRenderPosCache_; // guid -> last synced render position
-    std::unordered_map<uint64_t, bool> creatureWasMoving_;       // guid -> previous-frame movement state
+    std::unordered_map<uint64_t, bool> creatureWasMoving_;        // guid -> previous-frame movement state
+    std::unordered_map<uint64_t, bool> creatureWasSwimming_;     // guid -> previous-frame swim state (for anim transition detection)
+    std::unordered_map<uint64_t, bool> creatureWasFlying_;       // guid -> previous-frame flying state (for anim transition detection)
     std::unordered_map<uint64_t, bool> creatureSwimmingState_;   // guid -> currently in swim mode (SWIMMING flag)
     std::unordered_map<uint64_t, bool> creatureWalkingState_;    // guid -> walking (WALKING flag, selects Walk(4) vs Run(5))
     std::unordered_map<uint64_t, bool> creatureFlyingState_;     // guid -> currently flying (FLYING flag)