Consider Native File System API as a source

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https://web.dev/native-file-system/
https://groups.google.com/a/chromium.org/g/blink-dev/c/9Fcpl2KVfbk

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https://web.dev/file-handling/

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Could use this technique for using this API: https://discourse.elm-lang.org/t/service-worker-ffi/6408

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We'll need to mark sources as unavailable, if the source is used on another device.

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Opening files directly from the desktop: https://developer.chrome.com/blog/new-in-chrome-102/#file-handlers