fix: extract service worker setup to Svelte app initialization

lib/frontend/index.js

@@ -2,11 +2,14 @@ import App from './components/App.svelte'
 
 import * as stores from './stores'
 import * as services from './services'
+import serviceWorkerBoot from './sw-boot'
 
 const boot = () => {
 
   services.storageListener.register()
 
+  serviceWorkerBoot()
+
   new App({
     target: document.querySelector('#root'),
   })