Add task completion animations, subscription trials, and quiet debug console

- Completion animations: play user-selected animation on task card after completing,
  with DataManager guard to prevent race condition during animation playback.
  Works in both AllTasksView and ResidenceDetailView. Animation preference
  persisted via @AppStorage and configurable from Settings.
- Subscription: add trial fields (trialStart, trialEnd, trialActive) and
  subscriptionSource to model, cross-platform purchase guard, trial banner
  in upgrade prompt, and platform-aware subscription management in profile.
- Analytics: disable PostHog SDK debug logging and remove console print
  statements to reduce debug console noise.
- Documents: remove redundant nested do-catch blocks in ViewModel wrapper.
- Widgets: add debounced timeline reloads and thread-safe file I/O queue.
- Onboarding: fix animation leak on disappear, remove unused state vars.
- Remove unused files (ContentView, StateFlowExtensions, CustomView).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

iosApp/iosApp/MainTabView.swift

@@ -3,13 +3,13 @@ import SwiftUI
 struct MainTabView: View {
     @EnvironmentObject private var themeManager: ThemeManager
     @State private var selectedTab = 0
-    @StateObject private var authManager = AuthenticationManager.shared
+    @ObservedObject private var authManager = AuthenticationManager.shared
     @ObservedObject private var pushManager = PushNotificationManager.shared
     var refreshID: UUID
 
     var body: some View {
         TabView(selection: $selectedTab) {
-            NavigationView {
+            NavigationStack {
                 ResidencesListView()
             }
             .id(refreshID)
@@ -19,7 +19,7 @@ struct MainTabView: View {
             .tag(0)
             .accessibilityIdentifier(AccessibilityIdentifiers.Navigation.residencesTab)
 
-            NavigationView {
+            NavigationStack {
                 AllTasksView()
             }
             .id(refreshID)
@@ -29,7 +29,7 @@ struct MainTabView: View {
             .tag(1)
             .accessibilityIdentifier(AccessibilityIdentifiers.Navigation.tasksTab)
 
-            NavigationView {
+            NavigationStack {
                 ContractorsListView()
             }
             .id(refreshID)
@@ -39,7 +39,7 @@ struct MainTabView: View {
             .tag(2)
             .accessibilityIdentifier(AccessibilityIdentifiers.Navigation.contractorsTab)
 
-            NavigationView {
+            NavigationStack {
                 DocumentsWarrantiesView(residenceId: nil)
             }
             .id(refreshID)
@@ -50,7 +50,7 @@ struct MainTabView: View {
             .accessibilityIdentifier(AccessibilityIdentifiers.Navigation.documentsTab)
         }
         .tint(Color.appPrimary)
-        .onChange(of: authManager.isAuthenticated) { _ in
+        .onChange(of: authManager.isAuthenticated) { _, _ in
             selectedTab = 0
         }
         .onAppear {