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/Task/CompleteTaskView.swift

@@ -22,6 +22,7 @@ struct CompleteTaskView: View {
     @State private var showCamera: Bool = false
     @State private var selectedContractor: ContractorSummary? = nil
     @State private var showContractorPicker: Bool = false
+    @State private var observationTask: Task<Void, Never>? = nil
 
     var body: some View {
         NavigationStack {
@@ -293,6 +294,10 @@ struct CompleteTaskView: View {
             .onAppear {
                 contractorViewModel.loadContractors()
             }
+            .onDisappear {
+                observationTask?.cancel()
+                observationTask = nil
+            }
             .handleErrors(
                 error: errorMessage,
                 onRetry: { handleComplete() }
@@ -333,9 +338,11 @@ struct CompleteTaskView: View {
             completionViewModel.createTaskCompletion(request: request)
         }
 
-        // Observe the result
-        Task {
+        // Observe the result — store the Task so it can be cancelled on dismiss
+        observationTask?.cancel()
+        observationTask = Task {
             for await state in completionViewModel.createCompletionState {
+                if Task.isCancelled { break }
                 await MainActor.run {
                     if let success = state as? ApiResultSuccess<TaskCompletionResponse> {
                         self.isSubmitting = false