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/Views/InsightsView/InsightsView.swift

@@ -171,14 +171,14 @@ struct InsightsView: View {
             }
         }
         .sheet(isPresented: $showSubscriptionStore) {
-            FeelsSubscriptionStoreView()
+            FeelsSubscriptionStoreView(source: "insights_gate")
         }
         .background(
             theme.currentTheme.bg
                 .edgesIgnoringSafeArea(.all)
         )
         .onAppear {
-            EventLogger.log(event: "show_insights_view")
+            AnalyticsManager.shared.trackScreen(.insights)
             viewModel.generateInsights()
         }
         .padding(.top)