fix: extract service worker setup to Svelte app initialization

lib/frontend/stores/index.js

@@ -2,10 +2,12 @@ import configStore from './configStore'
 import eventStore from './eventStore'
 import parseStatusStore from './parseStatusStore'
 import requestStore from './requestStore'
+import swStatusStore from './swStatusStore'
 
 export {
   configStore,
   eventStore,
   parseStatusStore,
   requestStore,
+  swStatusStore,
 }