fix(notifications): clear scheduled notifications before refresh apply

Cancel all native notifications before applying the backend-provided schedule so
refreshNotifications always performs a full replacement and never leaves stale
entries behind.

src/services/notifications/NativeNotificationService.ts

@@ -585,6 +585,10 @@ export async function refreshNotifications(): Promise<void> {
       return;
     }
 
+    // Full replacement: clear prior scheduled notifications before applying backend schedule.
+    // (Plugin API name is cancelAllNotifications; equivalent intent to "clearAllNotifications".)
+    await DailyNotification.cancelAllNotifications();
+
     // Apply backend schedule to the native scheduler as recurring notifications.
     // The plugin's schedule API is cron/clockTime-based (recurring), so we map
     // the backend timestamps to clockTime (HH:mm) schedules.