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

docs/api/rhi/opengl/pipeline-state/get-depth-stencil-state.md

@@ -0,0 +1,25 @@
+# OpenGLPipelineState::GetDepthStencilState
+
+```cpp
+const OpenGLDepthStencilState& GetDepthStencilState() const;
+```
+
+获取当前深度模板状态。
+
+**返回：** 深度模板状态结构体引用
+
+**线程安全：** ❌
+
+**示例：**
+
+```cpp
+const auto& dsState = pipelineState->GetDepthStencilState();
+if (dsState.depthTestEnable) {
+    // depth test is enabled
+}
+```
+
+## 相关文档
+
+- [OpenGLPipelineState 总览](pipeline-state.md) - 返回类总览
+- [SetDepthStencilState](set-depth-stencil-state.md) - 设置深度模板状态