fix: the exported pdf has part white background in dark mode (#3408)

packages/component/src/components/workspace/index.css.ts

@@ -1,3 +1,4 @@
+import { lightCssVariables } from '@toeverything/theme';
 import type { ComplexStyleRule } from '@vanilla-extract/css';
 import { globalStyle, style } from '@vanilla-extract/css';
 
@@ -53,6 +54,12 @@ globalStyle(`html[data-theme="dark"] ${appStyle}`, {
   vars: {
     '--affine-noise-opacity': '0.1',
   },
+
+  '@media': {
+    print: {
+      vars: lightCssVariables,
+    },
+  },
 });
 
 export const mainContainerStyle = style({