Add app version management, update checks, and periodic SW updates

- Introduced version.json and appVersionAssetPlugin for build-time version tracking.
- Enhanced settings page with update check/status UI.
- Refactored bootstrap to handle SW updates and initiate periodic checks.

public/service-worker.js

@@ -3,7 +3,6 @@ const APP_SHELL = ['/', '/index.html', '/manifest.webmanifest', '/offline.html',
 
 self.addEventListener('install', (event) => {
   event.waitUntil(caches.open(CACHE_NAME).then((cache) => cache.addAll(APP_SHELL)));
-  self.skipWaiting();
 });
 
 self.addEventListener('activate', (event) => {
@@ -19,6 +18,12 @@ self.addEventListener('activate', (event) => {
   self.clients.claim();
 });
 
+self.addEventListener('message', (event) => {
+  if (event?.data?.type === 'SKIP_WAITING') {
+    self.skipWaiting();
+  }
+});
+
 self.addEventListener('fetch', (event) => {
   if (event.request.method !== 'GET') {
     return;
@@ -40,6 +45,11 @@ self.addEventListener('fetch', (event) => {
     return;
   }
 
+  if (requestUrl.pathname === '/version.json') {
+    event.respondWith(fetch(event.request, { cache: 'no-store' }));
+    return;
+  }
+
   const destination = event.request.destination;
   if (
     destination === 'script' ||