Add premium features and reorganize Settings tab

Premium Features:
- Journal notes and photo attachments for mood entries
- Data export (CSV and PDF reports)
- Privacy lock with Face ID/Touch ID
- Apple Health integration for mood correlation
- 4 new personality packs (Motivational Coach, Zen Master, Best Friend, Data Analyst)

Settings Tab Reorganization:
- Combined Customize and Settings into single tab with segmented control
- Added upgrade banner with trial countdown above segment
- "Why Upgrade?" sheet showing all premium benefits
- Subscribe button opens improved StoreKit 2 subscription view

UI Improvements:
- Enhanced subscription store with feature highlights
- Entry detail view for viewing/editing notes and photos
- Removed duplicate subscription banners from tab content

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

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

Shared/Views/MainTabView.swift

@@ -20,7 +20,6 @@ struct MainTabView: View {
     let monthView: MonthView
     let yearView: YearView
     let insightsView: InsightsView
-    let customizeView: CustomizeView
 
     var body: some View {
         return TabView {
@@ -44,9 +43,9 @@ struct MainTabView: View {
                     Label(String(localized: "content_view_tab_insights"), systemImage: "lightbulb.fill")
                 }
 
-            customizeView
+            SettingsTabView()
                 .tabItem {
-                    Label(String(localized: "content_view_tab_customize"), systemImage: "pencil")
+                    Label("Settings", systemImage: "gear")
                 }
         }
         .accentColor(textColor)
@@ -87,7 +86,6 @@ struct MainTabView_Previews: PreviewProvider {
         MainTabView(dayView: DayView(viewModel: DayViewViewModel(addMonthStartWeekdayPadding: false)),
                     monthView: MonthView(viewModel: DayViewViewModel(addMonthStartWeekdayPadding: true)),
                     yearView: YearView(viewModel: YearViewModel()),
-                    insightsView: InsightsView(),
-                    customizeView: CustomizeView())
+                    insightsView: InsightsView())
     }
 }