fix(android): cancel only fetch-related WorkManager jobs when scheduling daily notification

Prevents a second notification (UUID alarm) with fallback or placeholder text by
cancelling pending prefetch/fetch work when the user schedules or reschedules.
cleanupExistingNotificationSchedules only cancels alarms for DB schedule IDs;
alarms from DailyNotificationFetchWorker use a UUID and were never cancelled.

Add ScheduleHelper.cancelFetchRelatedWorkManagerJobs() to cancel only the
prefetch and daily_notification_fetch tags (not display, dismiss, or maintenance).
Call it after cleanup and before scheduleDailyNotification. Future fetched-content
flows can use distinct WorkManager tags and will not be affected by this path.

android/src/main/java/com/timesafari/dailynotification/DailyNotificationPlugin.kt

@@ -1137,6 +1137,14 @@ open class DailyNotificationPlugin : Plugin() {
                         Log.i(TAG, "scheduleDailyNotification: No cleanup needed - existing schedule will be updated via upsert: $scheduleId")
                     }
                     
+                    // Cancel only fetch-related WorkManager jobs so they cannot create a second (UUID) alarm
+                    // with fallback or placeholder text. Does not cancel display/dismiss; future fetched-content
+                    // flows should use distinct tags so they are not affected.
+                    val workCancelled = ScheduleHelper.cancelFetchRelatedWorkManagerJobs(context)
+                    if (workCancelled) {
+                        Log.i(TAG, "scheduleDailyNotification: Cancelled pending prefetch/fetch WorkManager jobs")
+                    }
+                    
                     val config = UserNotificationConfig(
                         enabled = true,
                         schedule = cronExpression,
@@ -2846,6 +2854,27 @@ object ScheduleHelper {
         }
     }
     
+    /**
+     * Cancel only WorkManager jobs that can create a second (UUID) alarm for the static-reminder path:
+     * prefetch and daily_notification_fetch. Does not cancel display, dismiss, or maintenance.
+     * Use this when handling scheduleDailyNotification so pending prefetch does not run and create
+     * a duplicate alarm; future fetched-content flows should use distinct tags so they are not affected.
+     *
+     * @param context Application context
+     * @return true if cancellation was successful
+     */
+    suspend fun cancelFetchRelatedWorkManagerJobs(context: Context): Boolean {
+        return try {
+            val workManager = WorkManager.getInstance(context)
+            workManager.cancelAllWorkByTag("prefetch")
+            workManager.cancelAllWorkByTag("daily_notification_fetch")
+            true
+        } catch (e: Exception) {
+            Log.w("ScheduleHelper", "Failed to cancel fetch-related WorkManager jobs", e)
+            false
+        }
+    }
+
     /**
      * Cancel all WorkManager jobs by tags
      *