Fix save work area.

Fix export graph with styles.
Fix css packer.

script/shared/utils.js

@@ -95,4 +95,9 @@ function getCanvasLogicWidth(canvas) {
 function getCanvasLogicHeight(canvas) {
     const dpr = window.devicePixelRatio || 1;
     return canvas.height / dpr;
+}
+
+function getLogicToCanvasSize(size) {
+    const dpr = window.devicePixelRatio || 1;
+    return size * dpr;
 }