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/DayView/DayView.swift

@@ -40,7 +40,7 @@ struct DayView: View {
         ZStack {
             mainView
                 .onAppear(perform: {
-                    EventLogger.log(event: "show_home_view")
+                    AnalyticsManager.shared.trackScreen(.day)
                 })
                 .sheet(isPresented: $showingSheet) {
                     SettingsView()