fix: ensure svelte dependency files are resolved reliably

Some svelte dependencies will require this setting. svelte-check made a
change in a recent release that the node-resolve plugin failed to find
it and added a `require('svelte-check')` statement which would fail.

rollup.config.mjs

@@ -24,6 +24,7 @@ export default {
         resolve({
             browser: true,
             dedupe: ["svelte"],
+            exportConditions: ['svelte'],
         }),
         commonjs(),
         postcss(),