docs(api): enhance theme api doc
@@ -663,7 +663,10 @@ class WindowManager extends WebviewWindowHandle {
/**
* Gets the window's current theme.
*
- * Only implemented on Windows and macOS 10.14+.
+ * #### Platform-specific
+ *
+ * - **Linux:** Not implemented, always returns `light`.
+ * - **macOS:** Theme was introduced on macOS 10.14. Returns `light` on macOS 10.13 and below.
*
* @example
* ```typescript
