AI CHASER STABILITY FIX (CRITICAL PATCH)
Replaced Event Tick with Timer-Based FakeTick in the AI Controller to reduce unnecessary CPU load and ensure consistent behavior across all hardware.
Added IsValid safety checks throughout the AI Controller and Behavior Tree Tasks:
Player references and pawn targets are now validated before access.
Prevents Accessed None crashes caused by perception of destroyed or unloaded actors.
Removed deprecated Trace by Channel damage logic, which was improperly targeting outdated damage interfaces and causing sporadic crashes on certain systems.
Cleaned up MoveTo Player and Frozen State BTTasks to fail gracefully when their targets are invalid, instead of crashing or locking behavior trees.