chore: ignore .svelte-kit anywhere, not just under web/

Generated SvelteKit files landed at the repo root when the web tooling ran from there,
and the previous rule only matched web/.svelte-kit/.

.gitignore

@@ -6,7 +6,7 @@ build/
 .env
 !web/.env
 node_modules/
-web/.svelte-kit/
+.svelte-kit/
 web/build/
 pipeline/work/
 pipeline/.nextflow*