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/Persisence/SharedModelContainer.swift

@@ -27,6 +27,10 @@ enum SharedModelContainerError: LocalizedError {
 enum SharedModelContainer {
     private static let logger = Logger(subsystem: Bundle.main.bundleIdentifier ?? "com.tt.feels", category: "SharedModelContainer")
 
+    /// Indicates whether the app is running with in-memory storage due to a failed App Group container.
+    /// When `true`, all data will be lost on app restart.
+    static private(set) var isUsingInMemoryFallback = false
+
     /// Creates a ModelContainer with the appropriate configuration for app group sharing
     /// - Parameter useCloudKit: Whether to enable CloudKit sync (defaults to true)
     /// - Returns: Configured ModelContainer
@@ -68,6 +72,11 @@ enum SharedModelContainer {
             return try create(useCloudKit: useCloudKit)
         } catch {
             logger.warning("Falling back to in-memory storage due to: \(error.localizedDescription)")
+            logger.critical("App is using in-memory storage — all mood data will be lost on restart. App Group container failed: \(error.localizedDescription)")
+            #if DEBUG
+            assertionFailure("SharedModelContainer fell back to in-memory storage. App Group container is unavailable: \(error.localizedDescription)")
+            #endif
+            isUsingInMemoryFallback = true
             // Fall back to in-memory storage
             let schema = Schema([MoodEntryModel.self])
             let config = ModelConfiguration(schema: schema, isStoredInMemoryOnly: true)