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It seems to be using Vercel to preview the app effect, which is quite interesting.

It's been some time that I worked with React Native, but I think you can use react-native-web to create web previews of the mobile app.

Yes, it provides pretty quick deployments. We just hit the limit a few minutes ago. Had to upgrade

In Project IDX you can view Flutter Web previews as a tab in VS Code. Have you considered trying some variant of that?