feat: compose Android app and verify native calendar and reminders

mobile/lib/services/android_calendar_service.dart

@@ -51,6 +51,11 @@ class AndroidCalendarService extends CalendarService {
   AndroidCalendarService(this.gateway);
   final CalendarGateway gateway;
   @override
+  Future<Map<String, String>> ownedEventIds(String calendarId) async => {
+    for (final event in await gateway.ownedEvents(calendarId))
+      if (event.owned && event.calendarId == calendarId) event.key: event.id,
+  };
+  @override
   Future<bool> requestAccess() => gateway.requestAccess();
   @override
   Future<List<DeviceCalendar>> listWritableCalendars() => gateway.calendars();

mobile/lib/services/calendar_service.dart

@@ -14,4 +14,6 @@ abstract class CalendarService {
     Map<String, String> knownEventIds,
   );
   Future<void> deleteOwned(Map<String, String> eventIds);
+  Future<Map<String, String>> ownedEventIds(String calendarId) async =>
+      const {};
 }

mobile/lib/services/local_notification_service.dart

@@ -147,18 +147,27 @@ class PluginReminderGateway extends ReminderGateway {
   final void Function(String key)? onTap;
   final _plugin = FlutterLocalNotificationsPlugin();
   Future<void>? _initializing;
-  Future<void> initialize() => _initializing ??= () async {
-    await _plugin.initialize(
-      settings: const InitializationSettings(
-        android: AndroidInitializationSettings('ic_stat_calendar'),
-      ),
-      onDidReceiveNotificationResponse: (response) => _select(response.payload),
-    );
-    final launch = await _plugin.getNotificationAppLaunchDetails();
-    if (launch?.didNotificationLaunchApp == true) {
-      _select(launch?.notificationResponse?.payload);
+  Future<void> initialize() => _initializing ??= Future<void>(() async {
+    try {
+      final ready = await _plugin.initialize(
+        settings: const InitializationSettings(
+          android: AndroidInitializationSettings('ic_stat_calendar'),
+        ),
+        onDidReceiveNotificationResponse: (response) =>
+            _select(response.payload),
+      );
+      if (ready != true) {
+        throw StateError('通知服务初始化失败');
+      }
+      final launch = await _plugin.getNotificationAppLaunchDetails();
+      if (launch?.didNotificationLaunchApp == true) {
+        _select(launch?.notificationResponse?.payload);
+      }
+    } catch (_) {
+      _initializing = null;
+      rethrow;
     }
-  }();
+  });
   void _select(String? payload) {
     if (payload?.startsWith('hepan:') == true) {
       onTap?.call(payload!.substring(6));