fix(render): convert Trace::width through the UI scale, and fold the controller's tolerance conversion into Style::device()

src/render/renderer.cpp

@@ -743,7 +743,12 @@ void Renderer::draw_traces(const Plot& plot, const PlotLayout& layout) {
 
     stage_xy(gather_.data(), static_cast<u32>(gather_.size() / 2u),
              plot.x_axis(trace.axis_x).log, plot.y_axis(trace.axis_y).log);
-    flush_lines(mapping(plot, trace.axis_x, trace.axis_y), trace.color, trace.width);
+    // A trace's width is a logical size like every other stroke here, so it is
+    // converted too: left raw, a 1.5 px trace would be drawn 1.5 device px against a
+    // 3 device px axis line at scale 2 -- half the logical weight, which inverts the
+    // trace/axis hierarchy on a high-DPI panel.
+    flush_lines(mapping(plot, trace.axis_x, trace.axis_y), trace.color,
+                style_.device(trace.width));
   }
 }