Replace EventLogger with typed AnalyticsManager using PostHog

Complete analytics overhaul: delete EventLogger.swift, create Analytics.swift
with typed event enum (~45 events), screen tracking, super properties
(theme, icon pack, voting layout, etc.), session replay with kill switch,
autocapture, and network telemetry. Replace all 99 call sites across 38 files
with compiler-enforced typed events in object_action naming convention.

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

Shared/Onboarding/views/OnboardingSubscription.swift

@@ -96,7 +96,7 @@ struct OnboardingSubscription: View {
                 VStack(spacing: 12) {
                     // Subscribe button
                     Button(action: {
-                        EventLogger.log(event: "onboarding_subscribe_tapped")
+                        AnalyticsManager.shared.track(.onboardingSubscribeTapped)
                         showSubscriptionStore = true
                     }) {
                         HStack {
@@ -120,8 +120,8 @@ struct OnboardingSubscription: View {
 
                     // Skip button
                     Button(action: {
-                        EventLogger.log(event: "onboarding_complete")
-                        EventLogger.log(event: "onboarding_skip_subscription")
+                        AnalyticsManager.shared.track(.onboardingCompleted(dayId: nil))
+                        AnalyticsManager.shared.track(.onboardingSkipped)
                         completionClosure(onboardingData)
                     }) {
                         Text("Maybe Later")
@@ -138,10 +138,10 @@ struct OnboardingSubscription: View {
         }
         .sheet(isPresented: $showSubscriptionStore, onDismiss: {
             // After subscription store closes, complete onboarding
-            EventLogger.log(event: "onboarding_complete")
+            AnalyticsManager.shared.track(.onboardingCompleted(dayId: nil))
             completionClosure(onboardingData)
         }) {
-            FeelsSubscriptionStoreView()
+            FeelsSubscriptionStoreView(source: "onboarding")
         }
     }
 }

Shared/Onboarding/views/OnboardingWrapup.swift

@@ -60,9 +60,7 @@ struct OnboardingWrapup: View {
                             .foregroundColor(Color(UIColor.white))
                         
                         Button(action: {
-                            EventLogger.log(event: "onboarding_complete")
-                            EventLogger.log(event: "onboarding_complete_day_id",
-                                            withData: ["id": onboardingData.inputDay.rawValue])
+                            AnalyticsManager.shared.track(.onboardingCompleted(dayId: String(onboardingData.inputDay.rawValue)))
                             completionClosure(onboardingData)
                         }, label: {
                             Text(String(localized: "onboarding_wrap_up_complete_button"))