feat: alphabet list, change Layout etc

lib/app/router.dart

@@ -103,6 +103,10 @@ GoRouter createAppRouter({
   required AdminPinViewModel adminPinViewModel,
   required RemoteSyncViewModel remoteSyncViewModel,
 }) {
+  // go_router drops `extra` when it rebuilds a route from its location, e.g.
+  // when the app returns from Android's installer, so keep the last update
+  UpdateInfo? lastUpdate;
+
   return GoRouter(
     initialLocation: '/bar',
     observers: [routeObserver, SentryNavigatorObserver()],
@@ -194,8 +198,12 @@ GoRouter createAppRouter({
 
       GoRoute(
         path: '/update-progress',
+        redirect: (context, state) {
+          if (state.extra case final UpdateInfo update) lastUpdate = update;
+          return lastUpdate == null ? '/settings' : null;
+        },
         builder: (context, state) {
-          final update = state.extra as UpdateInfo;
+          final update = lastUpdate!;
           final simulate = state.uri.queryParameters['simulate'] == 'true';
           final simulateError =
               state.uri.queryParameters['simulateError'] == 'true';