feat: Support exporting with dark mode (#3046)

Co-authored-by: Lipis <lipiridis@gmail.com>
Co-authored-by: dwelle <luzar.david@gmail.com>

src/types.ts

@@ -57,6 +57,7 @@ export type AppState = {
   elementLocked: boolean;
   exportBackground: boolean;
   exportEmbedScene: boolean;
+  exportWithDarkMode: boolean;
   shouldAddWatermark: boolean;
   currentItemStrokeColor: string;
   currentItemBackgroundColor: string;