fix: improve doc link navigation and tree display
- Fix link resolution with proper relative/absolute path handling - Improve link styling with underline decoration - Hide leaf nodes from tree, only show directories - Fix log file path for packaged app
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docs/api/math/vector2/cross.md
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docs/api/math/vector2/cross.md
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# Vector2::Cross
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```cpp
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static float Cross(const Vector2& a, const Vector2& b)
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```
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计算两个 2D 向量的叉积(返回标量)。结果为正值表示 b 在 a 的逆时针方向。
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**参数:**
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- `a` - 第一个向量
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- `b` - 第二个向量
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**返回:** `float` - 叉积结果 a.x * b.y - a.y * b.x
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**复杂度:** O(1)
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**示例:**
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```cpp
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Vector2 a(1.0f, 0.0f);
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Vector2 b(0.0f, 1.0f);
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float cross = Vector2::Cross(a, b); // 1.0f (逆时针)
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```
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