Fix build errors, resolve all warnings, and improve code quality

Widget Extension Fixes:
- Create standalone WidgetDataProvider for widget data isolation
- Add WIDGET_EXTENSION compiler flag for conditional compilation
- Fix DataController references in widget-shared files
- Sync widget version numbers with main app (23, 1.0.2)
- Add WidgetBackground color to asset catalog

Warning Resolutions:
- Fix UIScreen.main deprecation in BGView and SharingListView
- Fix Text '+' concatenation deprecation in PurchaseButtonView and SettingsTabView
- Fix exhaustive switch in BiometricAuthManager (add .none case)
- Fix var to let in ExportService (3 instances)
- Fix unused result warning in NoteEditorView
- Fix ForEach duplicate ID warnings in MonthView and YearView

Code Quality Improvements:
- Wrap bypassSubscription in #if DEBUG for security
- Rename StupidAssCustomWidgetObservableObject to CustomWidgetStateViewModel
- Add @MainActor to IconViewModel
- Replace fatalError with graceful fallback in SharedModelContainer
- Add [weak self] to closures in DayViewViewModel
- Add OSLog-based AppLogger for production logging
- Add ImageCache with NSCache for memory efficiency
- Add AccessibilityHelpers with Reduce Motion support
- Create DataControllerProtocol for dependency injection
- Update .gitignore with secrets exclusions

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

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

Shared/MoodStreakActivity.swift

@@ -181,7 +181,11 @@ class LiveActivityScheduler: ObservableObject {
         let dayStart = Calendar.current.startOfDay(for: votingDate)
         let dayEnd = Calendar.current.date(bySettingHour: 23, minute: 59, second: 59, of: dayStart)!
 
+        #if WIDGET_EXTENSION
+        let entry = WidgetDataProvider.shared.getData(startDate: dayStart, endDate: dayEnd, includedDays: []).first
+        #else
         let entry = DataController.shared.getData(startDate: dayStart, endDate: dayEnd, includedDays: []).first
+        #endif
         return entry != nil && entry?.mood != .missing && entry?.mood != .placeholder
     }
 
@@ -193,7 +197,11 @@ class LiveActivityScheduler: ObservableObject {
         // Check if current voting date has an entry
         let currentDayStart = Calendar.current.startOfDay(for: checkDate)
         let currentDayEnd = Calendar.current.date(bySettingHour: 23, minute: 59, second: 59, of: currentDayStart)!
+        #if WIDGET_EXTENSION
+        let currentEntry = WidgetDataProvider.shared.getData(startDate: currentDayStart, endDate: currentDayEnd, includedDays: []).first
+        #else
         let currentEntry = DataController.shared.getData(startDate: currentDayStart, endDate: currentDayEnd, includedDays: []).first
+        #endif
 
         // If no entry for current voting date, start counting from previous day
         // This ensures the streak shows correctly even if user hasn't rated today yet
@@ -205,7 +213,11 @@ class LiveActivityScheduler: ObservableObject {
             let dayStart = Calendar.current.startOfDay(for: checkDate)
             let dayEnd = Calendar.current.date(bySettingHour: 23, minute: 59, second: 59, of: dayStart)!
 
+            #if WIDGET_EXTENSION
+            let entry = WidgetDataProvider.shared.getData(startDate: dayStart, endDate: dayEnd, includedDays: []).first
+            #else
             let entry = DataController.shared.getData(startDate: dayStart, endDate: dayEnd, includedDays: []).first
+            #endif
 
             if let entry = entry, entry.mood != .missing && entry.mood != .placeholder {
                 streak += 1
@@ -224,7 +236,11 @@ class LiveActivityScheduler: ObservableObject {
         let dayStart = Calendar.current.startOfDay(for: votingDate)
         let dayEnd = Calendar.current.date(bySettingHour: 23, minute: 59, second: 59, of: dayStart)!
 
+        #if WIDGET_EXTENSION
+        let entry = WidgetDataProvider.shared.getData(startDate: dayStart, endDate: dayEnd, includedDays: []).first
+        #else
         let entry = DataController.shared.getData(startDate: dayStart, endDate: dayEnd, includedDays: []).first
+        #endif
         if let entry = entry, entry.mood != .missing && entry.mood != .placeholder {
             return entry.mood
         }