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/Models/UserDefaultsStore.swift

@@ -96,6 +96,7 @@ class UserDefaultsStore {
         case dayViewStyle
         case privacyLockEnabled
         case healthKitEnabled
+        case healthKitSyncEnabled
 
         case contentViewCurrentSelectedHeaderViewBackDays
         case contentViewHeaderTag