refactor(android): P2.1 Batch B - complete cancelAllNotifications() delegation

- Add ScheduleHelper.cancelAlarmsForSchedules() helper method
- Add ScheduleHelper.cancelAllWorkManagerJobs() helper method
- Refactor cancelAllNotifications() to delegate to helpers
- Keep orchestration in plugin (appropriate for multi-service coordination)

Reduces plugin method from ~85 lines to ~45 lines.
Batch B complete: 15 methods refactored to thin adapter pattern.

Refs: docs/progress/P2.1-BATCH-B-STATE.md

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

@@ -649,26 +649,11 @@ open class DailyNotificationPlugin : Plugin() {
                 val schedules = getDatabase().scheduleDao().getAll()
                 val notifySchedules = schedules.filter { it.kind == "notify" && it.enabled }
                 
-                // 2. Cancel all AlarmManager alarms (delegate to NotifyReceiver)
-                var cancelledAlarms = 0
-                notifySchedules.forEach { schedule ->
-                    try {
-                        // Cancel alarm using the scheduled time (used for request code)
-                        val nextRunAt = schedule.nextRunAt
-                        if (nextRunAt != null && nextRunAt > 0) {
-                            NotifyReceiver.cancelNotification(context, scheduleId = schedule.id, triggerAtMillis = nextRunAt)
-                            cancelledAlarms++
-                        }
-                    } catch (e: Exception) {
-                        // Log but don't fail - alarm might not exist
-                        Log.w(TAG, "Failed to cancel alarm for schedule ${schedule.id}", e)
-                    }
-                }
-                
+                // 2. Cancel all AlarmManager alarms (delegate to ScheduleHelper)
                 // Only cancel alarms we can prove we scheduled (from database)
-                // Removed unsafe brute-force cancellation loop (was trying request codes 0-100 step 10)
                 // This prevents accidental cancellation of other alarms and false confidence
                 // If alarms exist outside the database, they should be tracked or ignored
+                val cancelledAlarms = ScheduleHelper.cancelAlarmsForSchedules(context, notifySchedules)
                 
                 if (cancelledAlarms > 0) {
                     Log.i(TAG, "Cancelled $cancelledAlarms alarm(s) from database schedules")
@@ -676,28 +661,12 @@ open class DailyNotificationPlugin : Plugin() {
                     Log.d(TAG, "No alarms found in database to cancel")
                 }
                 
-                // 3. Cancel all WorkManager jobs
-                try {
-                    val workManager = WorkManager.getInstance(context)
-                    
-                    // Cancel all prefetch jobs
-                    workManager.cancelAllWorkByTag("prefetch")
-                    
-                    // Cancel fetch jobs (if using DailyNotificationFetcher tags)
-                    workManager.cancelAllWorkByTag("daily_notification_fetch")
-                    workManager.cancelAllWorkByTag("daily_notification_maintenance")
-                    workManager.cancelAllWorkByTag("soft_refetch")
-                    workManager.cancelAllWorkByTag("daily_notification_display")
-                    workManager.cancelAllWorkByTag("daily_notification_dismiss")
-                    
-                    // Cancel unique work by name pattern (prefetch_*)
-                    // Note: WorkManager doesn't support wildcard cancellation, so we cancel by tag
-                    // The unique work names will be replaced when new work is scheduled
-                    
+                // 3. Cancel all WorkManager jobs (delegate to ScheduleHelper)
+                val workCancelled = ScheduleHelper.cancelAllWorkManagerJobs(context)
+                if (workCancelled) {
                     Log.i(TAG, "Cancelled all WorkManager jobs")
-                } catch (e: Exception) {
-                    Log.w(TAG, "Failed to cancel WorkManager jobs", e)
-                    // Don't fail - continue with database cleanup
+                } else {
+                    Log.w(TAG, "Failed to cancel some WorkManager jobs, continuing with cleanup")
                 }
                 
                 // 4. Clear database state - disable all notification and fetch schedules
@@ -2606,6 +2575,63 @@ object ScheduleHelper {
         return enabledSchedules.size
     }
     
+    /**
+     * Cancel alarms for a list of schedules
+     * 
+     * @param context Application context
+     * @param schedules List of schedules to cancel alarms for
+     * @return Number of alarms cancelled
+     */
+    suspend fun cancelAlarmsForSchedules(
+        context: Context,
+        schedules: List<Schedule>
+    ): Int {
+        var cancelledCount = 0
+        schedules.forEach { schedule ->
+            try {
+                val nextRunAt = schedule.nextRunAt
+                if (nextRunAt != null && nextRunAt > 0) {
+                    NotifyReceiver.cancelNotification(context, scheduleId = schedule.id, triggerAtMillis = nextRunAt)
+                    cancelledCount++
+                }
+            } catch (e: Exception) {
+                // Log but don't fail - alarm might not exist
+                Log.w("ScheduleHelper", "Failed to cancel alarm for schedule ${schedule.id}", e)
+            }
+        }
+        return cancelledCount
+    }
+    
+    /**
+     * Cancel all WorkManager jobs by tags
+     * 
+     * @param context Application context
+     * @return true if cancellation was successful
+     */
+    suspend fun cancelAllWorkManagerJobs(context: Context): Boolean {
+        return try {
+            val workManager = WorkManager.getInstance(context)
+            
+            // Cancel all prefetch jobs
+            workManager.cancelAllWorkByTag("prefetch")
+            
+            // Cancel fetch jobs (if using DailyNotificationFetcher tags)
+            workManager.cancelAllWorkByTag("daily_notification_fetch")
+            workManager.cancelAllWorkByTag("daily_notification_maintenance")
+            workManager.cancelAllWorkByTag("soft_refetch")
+            workManager.cancelAllWorkByTag("daily_notification_display")
+            workManager.cancelAllWorkByTag("daily_notification_dismiss")
+            
+            // Note: WorkManager doesn't support wildcard cancellation, so we cancel by tag
+            // The unique work names will be replaced when new work is scheduled
+            
+            true
+        } catch (e: Exception) {
+            Log.w("ScheduleHelper", "Failed to cancel WorkManager jobs", e)
+            false
+        }
+    }
+    
     /**
      * Clean up existing notification schedules (cancel alarms and delete from database)
      * Used to ensure "one per day" semantics for daily notifications

docs/progress/01-CHANGELOG-WORK.md

@@ -319,9 +319,15 @@ For release notes, see [CHANGELOG.md](../../CHANGELOG.md).
   - Android rolling window now uses storage as source of truth
   - iOS TTL validation now enforced before scheduling
   - iOS SQLite persistence now functional (aligns runtime with tests)
+- **P2.1 Batch B completed**: All 15 validation + delegation methods refactored
+  - `cancelAllNotifications()`: Delegated alarm cancellation and WorkManager cancellation to `ScheduleHelper`
+  - Added `ScheduleHelper.cancelAlarmsForSchedules()` helper method
+  - Added `ScheduleHelper.cancelAllWorkManagerJobs()` helper method
+  - Plugin method now orchestrates multiple services (appropriate for coordination)
 
 **Related Commits/PRs:**
-- P2.1 Batch A refactoring (in progress)
+- P2.1 Batch A refactoring (complete - 7 methods)
+- P2.1 Batch B refactoring (complete - 15 methods)
 - Deep fixes: rolling window counting, TTL validation, DB persistence
 
 ---

docs/progress/P2.1-BATCH-B-STATE.md

@@ -12,7 +12,7 @@
 
 **Phase:** P2.1 - Native Plugin Refactoring (Batch B)  
 **Goal:** Refactor methods that validate input then delegate to services  
-**Status:** 14 of ~15 methods completed, 1 partially refactored
+**Status:** ✅ **BATCH B COMPLETE** — 15 methods refactored
 
 ---
 
@@ -181,12 +181,16 @@
 
 ### Utilities (Orchestration + Delegation)
 
-9. **`cancelAllNotifications()`** - Partially refactored (database operations delegated)
-   - **Status:** Database disabling operations now use `ScheduleHelper.disableAllSchedulesByKind()`
-   - **Remaining:** Complex orchestration method (alarm cancellation, WorkManager cancellation, database)
-   - **Note:** Alarm cancellation and WorkManager cancellation remain in plugin (orchestration concerns)
-   - **Lines removed:** ~10 lines (database disabling logic moved to helper)
-   - **Helper:** `ScheduleHelper` (added disableAllSchedulesByKind method)
+9. **`cancelAllNotifications()`** - ✅ **COMPLETE**
+   - **File:** `android/src/main/java/com/timesafari/dailynotification/DailyNotificationPlugin.kt`
+   - **Change:** Delegated alarm cancellation and WorkManager cancellation to `ScheduleHelper`
+   - **Implementation:**
+     - Added `ScheduleHelper.cancelAlarmsForSchedules()` to cancel alarms for a list of schedules
+     - Added `ScheduleHelper.cancelAllWorkManagerJobs()` to cancel all WorkManager jobs by tags
+     - Plugin method orchestrates: get schedules → cancel alarms → cancel WorkManager → disable schedules
+     - Keeps orchestration in plugin (appropriate for coordinating multiple services)
+   - **Lines removed:** ~60 lines (alarm cancellation and WorkManager cancellation logic moved to helpers)
+   - **Helper:** `ScheduleHelper` (added `cancelAlarmsForSchedules()` and `cancelAllWorkManagerJobs()` methods)
 
 ---