feat: compose Android app and verify native calendar and reminders

mobile/lib/app/hepan_app.dart

@@ -1,4 +1,8 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
+
+import '../domain/schedule_engine.dart';
+import '../features/timetable/course_details.dart';
 
 import 'app_controller.dart';
 import 'app_theme.dart';
@@ -13,28 +17,40 @@ class HepanApp extends StatelessWidget {
     required this.controller,
     this.schoolBuilder,
     this.school,
+    this.notificationSelection,
   });
   final AppController controller;
   final Widget Function()? schoolBuilder;
   final SchoolSession? school;
+  final ValueNotifier<String?>? notificationSelection;
   @override
   Widget build(BuildContext context) => MaterialApp(
     debugShowCheckedModeBanner: false,
     title: '河畔Everyday',
     theme: hepanTheme(),
+    locale: const Locale('zh', 'CN'),
+    supportedLocales: const [Locale('zh', 'CN')],
+    localizationsDelegates: GlobalMaterialLocalizations.delegates,
     home: _Shell(
       controller: controller,
       schoolBuilder: schoolBuilder,
       school: school,
+      notificationSelection: notificationSelection,
     ),
   );
 }
 
 class _Shell extends StatefulWidget {
-  const _Shell({required this.controller, this.schoolBuilder, this.school});
+  const _Shell({
+    required this.controller,
+    this.schoolBuilder,
+    this.school,
+    this.notificationSelection,
+  });
   final AppController controller;
   final Widget Function()? schoolBuilder;
   final SchoolSession? school;
+  final ValueNotifier<String?>? notificationSelection;
   @override
   State<_Shell> createState() => _ShellState();
 }
@@ -45,14 +61,45 @@ class _ShellState extends State<_Shell> with WidgetsBindingObserver {
   void initState() {
     super.initState();
     WidgetsBinding.instance.addObserver(this);
+    widget.notificationSelection?.addListener(_selectNotification);
+    WidgetsBinding.instance.addPostFrameCallback((_) => _selectNotification());
   }
 
   @override
   void dispose() {
     WidgetsBinding.instance.removeObserver(this);
+    widget.notificationSelection?.removeListener(_selectNotification);
     super.dispose();
   }
 
+  Future<void> _selectNotification() async {
+    final key = widget.notificationSelection?.value;
+    if (key == null || !mounted) {
+      return;
+    }
+    widget.notificationSelection!.value = null;
+    await widget.controller.leaveDemo();
+    if (!mounted) {
+      return;
+    }
+    Navigator.of(context).popUntil((route) => route.isFirst);
+    setState(() => _tab = 0);
+    final semester = widget.controller.snapshot.settings.semester;
+    if (semester == null) {
+      return;
+    }
+    final events = ScheduleEngine.occurrences(
+      widget.controller.snapshot.courses,
+      semester,
+    ).where((e) => e.key == key);
+    if (events.isNotEmpty) {
+      showCourseDetails(context, events.first);
+    } else {
+      ScaffoldMessenger.of(context)
+          .showSnackBar(const SnackBar(content: Text('这门课程已更新，请查看当前课表')));
+    }
+  }
+
   @override
   void didChangeAppLifecycleState(AppLifecycleState state) {
     if (state == AppLifecycleState.resumed) {