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/Models/CustomWidgetStateViewModel.swift

@@ -0,0 +1,13 @@
+//
+//  CustomWidgetStateViewModel.swift
+//  Feels
+//
+//  Created by Trey Tartt on 3/31/22.
+//
+
+import Foundation
+
+class CustomWidgetStateViewModel: ObservableObject {
+    @Published var selectedItem: CustomWidgetModel? = nil
+    @Published var showSheet = false
+}

Shared/Models/SharingImageModels.swift

@@ -8,9 +8,9 @@
 import SwiftUI
 import LinkPresentation
 
-class StupidAssShareObservableObject: ObservableObject {
-    @Published var fuckingWrappedShrable: UIImage? = nil
-    @Published var showFuckingSheet = false
+class ShareImageStateViewModel: ObservableObject {
+    @Published var selectedShareImage: UIImage? = nil
+    @Published var showSheet = false
 }
 
 class ShareActivityItemSource: NSObject, UIActivityItemSource {

Shared/Models/StupidAssCustomWidgetObservableObject.swift

@@ -1,13 +0,0 @@
-//
-//  StupidAssCustomWidgetObservableObject.swift
-//  Feels
-//
-//  Created by Trey Tartt on 3/31/22.
-//
-
-import Foundation
-
-class StupidAssCustomWidgetObservableObject: ObservableObject {
-    @Published var fuckingWrapped: CustomWidgetModel? = nil
-    @Published var showFuckingSheet = false
-}