Fix boundary bugs, route side effects through MoodLogger, add data listeners

- Fix ExtensionDataProvider <= boundary to < in date queries (prevented cross-day leaks)
- Replace force-unwraps with guards and add error logging in DataControllerGET and ExtensionDataProvider
- Route DayViewViewModel update/delete through MoodLogger.shared (was duplicating side effects)
- Add data listeners to InsightsViewModel and YearViewModel for cross-tab refresh
- Add HealthKitManager.deleteMood(for:) for single-date cleanup
- Add SharedModelContainer.isUsingInMemoryFallback flag with critical logging
- Add analytics events: entryDeleted, allDataCleared, duplicatesRemoved, storageFallbackActivated

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Shared/Views/DayView/DayViewViewModel.swift

@@ -7,7 +7,6 @@
 
 import SwiftUI
 import SwiftData
-import WidgetKit
 
 @MainActor
 class DayViewViewModel: ObservableObject {
@@ -61,25 +60,8 @@ class DayViewViewModel: ObservableObject {
     }
 
     public func update(entry: MoodEntryModel, toMood mood: Mood) {
-        if !DataController.shared.update(entryDate: entry.forDate, withMood: mood) {
+        if !MoodLogger.shared.updateMood(entryDate: entry.forDate, withMood: mood) {
             print("Failed to update mood entry")
-            return
-        }
-
-        // Sync to HealthKit for past day updates (only if user has full access)
-        guard mood != .missing && mood != .placeholder else { return }
-
-        let healthKitEnabled = GroupUserDefaults.groupDefaults.bool(forKey: UserDefaultsStore.Keys.healthKitEnabled.rawValue)
-        let hasAccess = !IAPManager.shared.shouldShowPaywall
-        if healthKitEnabled && hasAccess {
-            Task {
-                try? await HealthKitManager.shared.saveMood(mood, for: entry.forDate)
-            }
-        }
-
-        // Reload widgets asynchronously to avoid UI delay
-        Task { @MainActor in
-            WidgetCenter.shared.reloadAllTimelines()
         }
     }
 
@@ -95,13 +77,9 @@ class DayViewViewModel: ObservableObject {
                 entriesToDelete.append(obj)
             }
             entriesToDelete.forEach({ entry in
-                let entryDate = entry.forDate
-                DataController.shared.modelContext.delete(entry)
-                self.add(mood: .missing, forDate: entryDate, entryType: .listView)
+                MoodLogger.shared.deleteMood(forDate: entry.forDate)
             })
         }
-
-        DataController.shared.save()
     }
 
     static func updateTitleHeader(forEntry entry: MoodEntryModel?) -> String {

Shared/Views/InsightsView/InsightsViewModel.swift

@@ -51,6 +51,19 @@ class InsightsViewModel: ObservableObject {
 
     init() {
         isAIAvailable = insightService.isAvailable
+
+        DataController.shared.addNewDataListener { [weak self] in
+            self?.onDataChanged()
+        }
+    }
+
+    /// Called when mood data changes in another tab. Invalidates cached insights
+    /// so they are regenerated with fresh data on next view appearance.
+    private func onDataChanged() {
+        insightService.invalidateCache()
+        monthLoadingState = .idle
+        yearLoadingState = .idle
+        allTimeLoadingState = .idle
     }
 
     // MARK: - Public Methods

Shared/Views/YearView/YearViewModel.swift

@@ -25,9 +25,19 @@ class YearViewModel: ObservableObject {
     }
 
     init() {
+        DataController.shared.addNewDataListener { [weak self] in
+            self?.refreshData()
+        }
         updateData()
     }
 
+    /// Re-fetch data using the current date range. Called by the data listener
+    /// when mood entries change in other tabs.
+    public func refreshData() {
+        updateData()
+        filterEntries(startDate: entryStartDate, endDate: entryEndDate)
+    }
+
     private func updateData() {
         let filteredEntries = DataController.shared.getData(startDate: Date(timeIntervalSince1970: 0),
                                                             endDate: Date(),