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>

FeelsWidget2/FeelsVoteWidget.swift

@@ -34,7 +34,7 @@ struct VoteMoodIntent: AppIntent {
 
         // Widget uses simplified mood logging since it can't access HealthKitManager/TipsManager
         // Full side effects (HealthKit sync, TipKit) will run when main app opens via MoodLogger
-        DataController.shared.add(mood: mood, forDate: votingDate, entryType: .widget)
+        WidgetDataProvider.shared.add(mood: mood, forDate: votingDate, entryType: .widget)
 
         // Store last voted date
         let dateString = ISO8601DateFormatter().string(from: Calendar.current.startOfDay(for: votingDate))
@@ -53,24 +53,8 @@ struct VoteMoodIntent: AppIntent {
 
     @MainActor
     private func calculateCurrentStreak() -> Int {
-        var streak = 0
-        var checkDate = ShowBasedOnVoteLogics.getCurrentVotingDate(onboardingData: UserDefaultsStore.getOnboarding())
-
-        while true {
-            let dayStart = Calendar.current.startOfDay(for: checkDate)
-            let dayEnd = Calendar.current.date(bySettingHour: 23, minute: 59, second: 59, of: dayStart)!
-
-            let entry = DataController.shared.getData(startDate: dayStart, endDate: dayEnd, includedDays: []).first
-
-            if let entry = entry, entry.mood != .missing && entry.mood != .placeholder {
-                streak += 1
-                checkDate = Calendar.current.date(byAdding: .day, value: -1, to: checkDate)!
-            } else {
-                break
-            }
-        }
-
-        return streak
+        // Use WidgetDataProvider for read operations
+        return WidgetDataProvider.shared.getCurrentStreak()
     }
 }
 
@@ -142,12 +126,15 @@ struct VoteWidgetProvider: TimelineProvider {
     private func createEntry() -> VoteWidgetEntry {
         let hasSubscription = GroupUserDefaults.groupDefaults.bool(forKey: UserDefaultsStore.Keys.hasActiveSubscription.rawValue)
 
+        // Use WidgetDataProvider for isolated read-only data access
+        let dataProvider = WidgetDataProvider.shared
+
         let votingDate = ShowBasedOnVoteLogics.getCurrentVotingDate(onboardingData: UserDefaultsStore.getOnboarding())
         let dayStart = Calendar.current.startOfDay(for: votingDate)
         let dayEnd = Calendar.current.date(bySettingHour: 23, minute: 59, second: 59, of: dayStart)!
 
         // Check if user has voted today
-        let todayEntry = DataController.shared.getData(startDate: dayStart, endDate: dayEnd, includedDays: []).first
+        let todayEntry = dataProvider.getData(startDate: dayStart, endDate: dayEnd, includedDays: []).first
         let hasVotedToday = todayEntry != nil && todayEntry?.mood != Mood.missing && todayEntry?.mood != Mood.placeholder
 
         // Get today's mood if voted
@@ -156,7 +143,7 @@ struct VoteWidgetProvider: TimelineProvider {
         // Get stats for display after voting
         var stats: MoodStats? = nil
         if hasVotedToday {
-            let allEntries = DataController.shared.getData(
+            let allEntries = dataProvider.getData(
                 startDate: Date(timeIntervalSince1970: 0),
                 endDate: Date(),
                 includedDays: []