Update PWA version for focus improvements

- Bumped service worker cache to v8
- Updated manifest version to 1.0.2
- Forces PWA refresh to pick up keyboard focus improvements

public/manifest.json

@@ -2,7 +2,7 @@
   "name": "Ultimate Lists",
   "short_name": "Lists",
   "description": "The ultimate todo list app with advanced task management and continuous task input",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "start_url": "/",
   "scope": "/",
   "display": "standalone",