refactor: use nuxt plugin to provide pwa helpers globally (#604)

composables/pwa/index.ts

@@ -1,43 +0,0 @@
-import { useRegisterSW } from 'virtual:pwa-register/vue'
-
-export function usePWA() {
-  const online = useOnline()
-
-  const {
-    needRefresh, updateServiceWorker,
-  } = useRegisterSW({
-    immediate: true,
-    onRegisteredSW(swUrl, r) {
-      if (!r || r.installing)
-        return
-
-      setInterval(async () => {
-        if (!online.value)
-          return
-
-        const resp = await fetch(swUrl, {
-          cache: 'no-store',
-          headers: {
-            'cache': 'no-store',
-            'cache-control': 'no-cache',
-          },
-        })
-
-        if (resp?.status === 200)
-          await r.update()
-      }, 60 * 60 * 1000 /* 1 hour */)
-    },
-  })
-
-  const close = async () => {
-    needRefresh.value = false
-  }
-
-  return {
-    needRefresh,
-    updateServiceWorker,
-    close,
-  }
-}
-
-export const pwa = reactive(usePWA())