Convert timetable state management to Riverpod

[Copilot]

Migrates class and schedule management from local StatefulWidget state to centralized Riverpod state management.

Changes

New Provider Infrastructure

• TimetableProvider: StateNotifier managing AsyncValue<Timetable?> with fetch, add, update, and set operations
• Handles API calls and SharedPreferences persistence automatically

Component Updates

• HomeScreen & CalendarScreen: Converted to ConsumerStatefulWidget
• Removed local timetable state variables and fetch methods
• State access via ref.watch(timetableProvider), mutations via ref.read(timetableProvider.notifier)
• Async state handling with .when() for loading/error/data states

App Initialization

• Wrapped root with ProviderScope in main.dart

Example

Before:

class _HomeScreenState extends State<HomeScreen> {
  Timetable? timetable;
  
  Future<void> fetchTimetable() async {
    final response = await ApiServices().getTimetable(context);
    setState(() { timetable = response; });
    await SharedService().saveTimetable(response);
  }
}

After:

class _HomeScreenState extends ConsumerState<HomeScreen> {
  @override
  Widget build(BuildContext context) {
    final timetableAsyncValue = ref.watch(timetableProvider);
    
    return timetableAsyncValue.when(
      data: (timetable) => HomeScreenSchedule(timetable: timetable),
      loading: () => CircularProgressIndicator(),
      error: (e, st) => ErrorWidget(),
    );
  }
}

Dependencies

• Added flutter_riverpod: ^2.6.1

Original prompt

convert state management to riverpod in frontend for class and schedule management

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