feat(render): logical style metrics with a UI scale, so chrome has a consistent physical size

adapters/glfw/glfw_host.hpp

@@ -48,7 +48,10 @@ using FrameFn = std::function<void(plot::Plot&, f64 dt)>;
 /// `glfwGetWindowSize()` disagree. The host calls `begin_frame` with the
 /// framebuffer size and scales every pointer coordinate by the ratio
 /// `framebuffer / window`, so a gesture lands on the pixels the plot was laid out
-/// in. On an unscaled display the ratio is 1.0 and nothing changes.
+/// in. The same ratio states the display to the renderer
+/// (`Style::ui_scale`), which is what makes the chrome -- labels, strokes, paddings
+/// -- one physical size at any scale. On an unscaled display the ratio is 1.0 and
+/// nothing changes.
 ///
 /// Headless smoke mode, read once per `run()`:
 ///