Render startup immediately and defer native work with a smooth home transition

mobile/lib/main.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 import 'package:path_provider/path_provider.dart';
 import 'package:timezone/data/latest.dart' as tzdata;
@@ -25,21 +27,31 @@ Widget buildApplication(
 );
 Future<void> main() async {
   WidgetsFlutterBinding.ensureInitialized();
-  tzdata.initializeTimeZones();
-  final selection = ValueNotifier<String?>(null);
-  final gateway = PluginReminderGateway(onTap: (key) => selection.value = key);
-  final controller = AppController(
-    FileSnapshotStore(await getApplicationSupportDirectory()),
-    LocalNotificationService(gateway),
-    AndroidCalendarService(MethodCalendarGateway()),
-    DateTime.now,
-  );
+  AppController? controller;
   await launchApplication(
-    ready: controller.initialize(),
-    child: buildApplication(
-      controller,
-      notificationSelection: selection,
-      school: SchoolSession(),
-    ),
+    bootstrap: () async {
+      tzdata.initializeTimeZones();
+      final selection = ValueNotifier<String?>(null);
+      final gateway = PluginReminderGateway(
+        onTap: (key) => selection.value = key,
+      );
+      final value = AppController(
+        FileSnapshotStore(await getApplicationSupportDirectory()),
+        LocalNotificationService(gateway),
+        AndroidCalendarService(MethodCalendarGateway()),
+        DateTime.now,
+      );
+      await value.initialize(reconcileServices: false);
+      controller = value;
+      return buildApplication(
+        value,
+        notificationSelection: selection,
+        school: SchoolSession(),
+      );
+    },
+    onHomeReady: () {
+      final value = controller;
+      if (value != null) unawaited(value.refreshServices());
+    },
   );
 }