fix: improve floating-point precision handling in bernstein function

[ChengYi996]

问题：
部分 GPU（如 Adreno 740）在边界计算时产生微小浮点误差，
导致顶点被错误判定为越界。

解决方案：
使用 clamp() 容忍浮点精度误差，并添加参数有效性检查。

之前：
// ❌ 不处理（假设精度完美）
if(t > 1.0) return 0.0; // 1.0000002 会被拒绝

现在：
// ✅ 处理（容忍精度误差）
t = clamp(t, 0.0, 1.0); // 1.0000002 修正为 1.0
if(k < 0 || k > n) return 0.0;

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