Add Apple platform features and UX improvements

- Add HealthKit State of Mind sync for mood entries
- Add Live Activity with streak display and rating time window
- Add App Shortcuts/Siri integration for voice mood logging
- Add TipKit hints for feature discovery
- Add centralized MoodLogger for consistent side effects
- Add reminder time setting in Settings with time picker
- Fix duplicate notifications when changing reminder time
- Fix Live Activity streak showing 0 when not yet rated today
- Fix slow tap response in entry detail mood selection
- Update widget timeline to refresh at rating time
- Sync widgets when reminder time changes

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Shared/Views/DayView/DayViewViewModel.swift

@@ -7,6 +7,7 @@
 
 import SwiftUI
 import SwiftData
+import WidgetKit
 
 @MainActor
 class DayViewViewModel: ObservableObject {
@@ -60,12 +61,28 @@ class DayViewViewModel: ObservableObject {
     }
 
     public func add(mood: Mood, forDate date: Date, entryType: EntryType) {
-        DataController.shared.add(mood: mood, forDate: date, entryType: entryType)
+        MoodLogger.shared.logMood(mood, for: date, entryType: entryType)
     }
 
     public func update(entry: MoodEntryModel, toMood mood: Mood) {
         if !DataController.shared.update(entryDate: entry.forDate, withMood: mood) {
             print("Failed to update mood entry")
+            return
+        }
+
+        // Sync to HealthKit for past day updates
+        guard mood != .missing && mood != .placeholder else { return }
+
+        let healthKitEnabled = GroupUserDefaults.groupDefaults.bool(forKey: UserDefaultsStore.Keys.healthKitEnabled.rawValue)
+        if healthKitEnabled {
+            Task {
+                try? await HealthKitManager.shared.saveMood(mood, for: entry.forDate)
+            }
+        }
+
+        // Reload widgets asynchronously to avoid UI delay
+        Task { @MainActor in
+            WidgetCenter.shared.reloadAllTimelines()
         }
     }