Add notification permission flow in settings

lib/features/reminders/scheduling/reminder_scheduler.dart

@@ -7,6 +7,9 @@ abstract class ReminderScheduler {
 
   /// Clears all platform-scheduled reminder jobs.
   Future<void> clearAll();
+
+  /// Requests notification permissions where the platform requires them.
+  Future<bool> requestPermissions();
 }
 
 /// Default scheduler used until platform notifications are integrated.
@@ -18,4 +21,7 @@ class NoopReminderScheduler implements ReminderScheduler {
 
   @override
   Future<void> reconcile(List<ReminderRule> reminders) async {}
+
+  @override
+  Future<bool> requestPermissions() async => true;
 }

lib/features/reminders/scheduling/reminder_scheduler_local_notifications.dart

@@ -59,6 +59,15 @@ class LocalNotificationsReminderScheduler implements ReminderScheduler {
     }
   }
 
+  @override
+  Future<bool> requestPermissions() async {
+    if (!_supportsSchedulingPlatform()) {
+      return false;
+    }
+    await _driver.ensureInitialized();
+    return _driver.requestPermissions();
+  }
+
   DateTimeComponents? _repeatComponents(ReminderCadence cadence) {
     return switch (cadence) {
       ReminderCadence.daily => DateTimeComponents.time,
@@ -107,6 +116,8 @@ abstract class ReminderNotificationsDriver {
     required DateTimeComponents? repeatComponents,
     required String payload,
   });
+
+  Future<bool> requestPermissions();
 }
 
 class FlutterReminderNotificationsDriver
@@ -148,6 +159,38 @@ class FlutterReminderNotificationsDriver
     );
   }
 
+  @override
+  Future<bool> requestPermissions() async {
+    if (defaultTargetPlatform == TargetPlatform.android) {
+      return await _plugin
+              .resolvePlatformSpecificImplementation<
+                AndroidFlutterLocalNotificationsPlugin
+              >()
+              ?.requestNotificationsPermission() ??
+          false;
+    }
+
+    if (defaultTargetPlatform == TargetPlatform.iOS) {
+      return await _plugin
+              .resolvePlatformSpecificImplementation<
+                IOSFlutterLocalNotificationsPlugin
+              >()
+              ?.requestPermissions(alert: true, badge: true, sound: true) ??
+          false;
+    }
+
+    if (defaultTargetPlatform == TargetPlatform.macOS) {
+      return await _plugin
+              .resolvePlatformSpecificImplementation<
+                MacOSFlutterLocalNotificationsPlugin
+              >()
+              ?.requestPermissions(alert: true, badge: true, sound: true) ??
+          false;
+    }
+
+    return true;
+  }
+
   Future<void> _initialize() async {
     await _plugin.initialize(
       settings: const InitializationSettings(