Replace PostHog integration with AnalyticsManager architecture

Remove old PostHogAnalytics singleton and replace with guide-based
two-file architecture: AnalyticsManager (singleton wrapper with super
properties, session replay, opt-out, subscription funnel) and
AnalyticsEvent (type-safe enum with associated values).

Key changes:
- New API key, self-hosted analytics endpoint
- All 19 events ported to type-safe AnalyticsEvent enum
- Screen tracking via AnalyticsManager.Screen enum + SwiftUI modifier
- Remove all identify() calls — fully anonymous analytics
- Add lifecycle hooks: flush on background, update super properties on foreground
- Add privacy opt-out toggle in Settings
- Subscription funnel methods ready for IAP integration

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

iosApp/iosApp/Task/CompleteTaskView.swift

@@ -221,7 +221,11 @@ struct CompleteTaskView: View {
                                             onRemove: {
                                                 withAnimation {
                                                     selectedImages.remove(at: index)
-                                                    selectedItems.remove(at: index)
+                                                    // Camera photos don't exist in selectedItems.
+                                                    // Guard the index to avoid out-of-bounds crashes.
+                                                    if index < selectedItems.count {
+                                                        selectedItems.remove(at: index)
+                                                    }
                                                 }
                                             }
                                         )
@@ -333,25 +337,19 @@ struct CompleteTaskView: View {
         Task {
             for await state in completionViewModel.createCompletionState {
                 await MainActor.run {
-                    switch state {
-                    case let success as ApiResultSuccess<TaskCompletionResponse>:
+                    if let success = state as? ApiResultSuccess<TaskCompletionResponse> {
                         self.isSubmitting = false
                         self.onComplete(success.data?.updatedTask)  // Pass back updated task
                         self.dismiss()
-                    case let error as ApiResultError:
+                    } else if let error = ApiResultBridge.error(from: state) {
                         self.errorMessage = error.message
                         self.showError = true
                         self.isSubmitting = false
-                    case is ApiResultLoading:
-                        // Still loading, continue waiting
-                        break
-                    default:
-                        break
                     }
                 }
 
                 // Break out of loop on terminal states
-                if state is ApiResultSuccess<TaskCompletionResponse> || state is ApiResultError {
+                if state is ApiResultSuccess<TaskCompletionResponse> || ApiResultBridge.isError(state) {
                     break
                 }
             }
@@ -470,4 +468,3 @@ struct ContractorPickerView: View {
         }
     }
 }
-