Add AI-powered mental wellness features: Reflection Companion, Pattern Tags, Weekly Digest

Three new Foundation Models features to deepen user engagement with mental wellness:

1. AI Reflection Companion — personalized feedback after completing guided reflections,
   referencing the user's actual words with personality-pack-adapted tone
2. Mood Pattern Tags — auto-extracts theme tags (work, family, stress, etc.) from notes
   and reflections, displayed as colored pills on entries
3. Weekly Emotional Digest — BGTask-scheduled Sunday digest with headline, summary,
   highlight, and intention; shown as card in Insights tab with notification

All features: on-device (zero cost), premium-gated, iOS 26+ with graceful degradation.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Shared/BGTask.swift

@@ -11,6 +11,7 @@ import BackgroundTasks
 class BGTask {
     static let updateDBMissingID = "com.88oakapps.reflect.dbUpdateMissing"
     static let weatherRetryID = "com.88oakapps.reflect.weatherRetry"
+    static let weeklyDigestID = "com.88oakapps.reflect.weeklyDigest"
 
     @MainActor
     class func runFillInMissingDatesTask(task: BGProcessingTask) {
@@ -55,6 +56,65 @@ class BGTask {
         }
     }
 
+    @MainActor
+    class func runWeeklyDigestTask(task: BGProcessingTask) {
+        BGTask.scheduleWeeklyDigest()
+
+        task.expirationHandler = {
+            task.setTaskCompleted(success: false)
+        }
+
+        if #available(iOS 26, *) {
+            Task {
+                guard !IAPManager.shared.shouldShowPaywall else {
+                    task.setTaskCompleted(success: true)
+                    return
+                }
+
+                do {
+                    let digest = try await FoundationModelsDigestService.shared.generateWeeklyDigest()
+
+                    // Send local notification with the headline
+                    let personalityPack = UserDefaultsStore.personalityPackable()
+                    LocalNotification.scheduleDigestNotification(headline: digest.headline, personalityPack: personalityPack)
+
+                    task.setTaskCompleted(success: true)
+                } catch {
+                    print("Weekly digest generation failed: \(error)")
+                    task.setTaskCompleted(success: false)
+                }
+            }
+        } else {
+            task.setTaskCompleted(success: true)
+        }
+    }
+
+    class func scheduleWeeklyDigest() {
+        let request = BGProcessingTaskRequest(identifier: BGTask.weeklyDigestID)
+        request.requiresNetworkConnectivity = false
+        request.requiresExternalPower = false
+
+        // Schedule for next Sunday at 7 PM
+        let calendar = Calendar.current
+        var components = calendar.dateComponents([.yearForWeekOfYear, .weekOfYear], from: Date())
+        components.weekday = 1 // Sunday
+        components.hour = 19
+        components.minute = 0
+
+        var nextSunday = calendar.date(from: components) ?? Date()
+        if nextSunday <= Date() {
+            nextSunday = calendar.date(byAdding: .weekOfYear, value: 1, to: nextSunday)!
+        }
+
+        request.earliestBeginDate = nextSunday
+
+        do {
+            try BGTaskScheduler.shared.submit(request)
+        } catch {
+            print("Could not schedule weekly digest: \(error)")
+        }
+    }
+
     class func scheduleBackgroundProcessing() {
         let request = BGProcessingTaskRequest(identifier: BGTask.updateDBMissingID)
         request.requiresNetworkConnectivity = false