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.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "lonc-web",
-  "version": "0.1.3",
+  "version": "0.1.4",
   "private": true,
   "type": "module",
   "scripts": {