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/swap-chain/is-fullscreen.md

@@ -0,0 +1,21 @@
+# RHISwapChain::IsFullscreen
+
+```cpp
+virtual bool IsFullscreen() const = 0;
+```
+
+检查是否处于全屏模式。
+
+**返回：** 如果全屏返回 true
+
+**示例：**
+
+```cpp
+if (swapChain->IsFullscreen()) {
+    // 全屏模式
+}
+```
+
+## 相关文档
+
+- [RHISwapChain 总览](swap-chain.md) - 返回类总览