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Not really familiar with the tools mentioned, but have you thought of creating a PWA? Then you'll have a downloadable package if the user chooses to do so. There is an example provided by NextJS, maybe give that a spin to see if you have the functions you are looking for? https://github.com/vercel/next.js/tree/canary/examples/progressive-web-app
Another way to approach it is to wrap the web app in a webview and use Tauri for custom logic, see https://github.com/tauri-apps/wry. You'd need to teach yourself some Rust though. I'm sure you could achieve something similar with Express. The performance will be similar to using a browser so not terrible.