Fixes

• Rewrote the pitch composition matrix to fix the rotation angle issue of the third-person lean animation when the view pitch changes.
• Fixed the animation's snap‑back and intermittent jitter.
• 重写俯仰合成矩阵，以此修复第三人称据枪动画，在视角俯仰时的旋转角度问题。
• 修复了动画的回弹和间歇性抽搐。