Add missing svelte export condition to package.json

[mike-moreau]

For compatibility with vite-plugin-svelte https://github.com/sveltejs/vite-plugin-svelte/blob/main/docs/faq.md#missing-exports-condition

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Description

[rchavezj]

Please accept this PR :(

[salemlf]

Please accept this PR :(

It looks like the mantainer hasn't worked on the project since late 2022, hopefully a fork of the project will take off!