refactor: split providers into feature modules

lib/features/schedules/providers/tasks_providers.dart

@@ -0,0 +1,72 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../../../app/error_message.dart';
+import '../../../app/load_state.dart';
+import '../../../models/schedule_task.dart';
+import '../../shared/providers/core_providers.dart';
+
+final tasksProvider =
+    NotifierProvider<TasksNotifier, LoadState<List<ScheduleTask>>>(
+      () => TasksNotifier(),
+    );
+
+class TasksNotifier extends Notifier<LoadState<List<ScheduleTask>>> {
+  @override
+  LoadState<List<ScheduleTask>> build() =>
+      const LoadState.idle(<ScheduleTask>[]);
+
+  Future<void> load() async {
+    state = LoadState.loading(state.data);
+    try {
+      final api = ref.read(apiProvider);
+      final res = await api.getTasks();
+      final tasks = ScheduleTask.listFromApi(res.data);
+
+      state = tasks.isEmpty ? LoadState.empty(tasks) : LoadState.data(tasks);
+    } catch (e) {
+      state = LoadState.error(state.data, describeLoadError(e));
+    }
+  }
+
+  Future<void> cancel(String jobId) async {
+    await ref.read(apiProvider).cancelTask(jobId);
+    await load();
+  }
+
+  Future<void> addOnce({
+    required String targetId,
+    required bool targetState,
+    int? hoursFromNow,
+    String? runAt,
+    bool isGroup = true,
+  }) async {
+    final params = <String, dynamic>{
+      'target_id': targetId,
+      'state': targetState,
+      'is_group': isGroup,
+    };
+    if (hoursFromNow != null) params['hours_from_now'] = hoursFromNow;
+    if (runAt != null) params['run_at'] = runAt;
+    await ref.read(apiProvider).scheduleOnce(params);
+    await load();
+  }
+
+  Future<void> addCron({
+    required String targetId,
+    required String hour,
+    required String minute,
+    String dayOfWeek = '*',
+    bool isGroup = true,
+    bool targetState = true,
+  }) async {
+    await ref.read(apiProvider).scheduleCron({
+      'target_id': targetId,
+      'hour': hour,
+      'minute': minute,
+      'day_of_week': dayOfWeek,
+      'is_group': isGroup,
+      'state': targetState,
+    });
+    await load();
+  }
+}