Ice Barrier, NPC Movement, and Position Synchronization Fixes

This update resolves several issues affecting skill targeting and position synchronization.

### Ice Barrier

Fixed an issue that occasionally caused Ice Barrier to follow the direction of the character model instead of the player’s camera aim.

The skill now follows the intended targeting direction more consistently.

### NPC Movement

Corrected the final position synchronization of NPCs after using movement skills.

This resolves a visual issue that could make NPCs appear to slide after they had stopped moving.

### Player Synchronization

Improved the character-positioning system to reduce cases of player desynchronization during movement and combat.