feat: add PostHog analytics with full event tracking across app

Integrate self-hosted PostHog (SPM) with AnalyticsManager singleton wrapping
all SDK calls. Adds ~40 type-safe events covering trip planning, schedule,
progress, IAP, settings, polls, export, and share flows. Includes session
replay, autocapture, network telemetry, privacy opt-out toggle in Settings,
and super properties (app version, device, pro status, selected sports).

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

SportsTime/Features/Settings/Views/SettingsView.swift

@@ -39,6 +39,9 @@ struct SettingsView: View {
             // Travel Preferences
             travelSection
 
+            // Privacy
+            privacySection
+
             // Icon Generator
             iconGeneratorSection
 
@@ -79,6 +82,7 @@ struct SettingsView: View {
                 Button {
                     withAnimation(.easeInOut(duration: 0.2)) {
                         AppearanceManager.shared.currentMode = mode
+                        AnalyticsManager.shared.track(.appearanceChanged(mode: mode.displayName))
                     }
                 } label: {
                     HStack(spacing: 12) {
@@ -181,7 +185,10 @@ struct SettingsView: View {
         Section {
             Toggle(isOn: Binding(
                 get: { DesignStyleManager.shared.animationsEnabled },
-                set: { DesignStyleManager.shared.animationsEnabled = $0 }
+                set: {
+                    DesignStyleManager.shared.animationsEnabled = $0
+                    AnalyticsManager.shared.track(.animationsToggled(enabled: $0))
+                }
             )) {
                 Label {
                     VStack(alignment: .leading, spacing: 2) {
@@ -257,6 +264,42 @@ struct SettingsView: View {
         .listRowBackground(Theme.cardBackground(colorScheme))
     }
 
+    // MARK: - Privacy Section
+
+    private var privacySection: some View {
+        Section {
+            Toggle(isOn: Binding(
+                get: { !AnalyticsManager.shared.isOptedOut },
+                set: { enabled in
+                    if enabled {
+                        AnalyticsManager.shared.optIn()
+                    } else {
+                        AnalyticsManager.shared.optOut()
+                    }
+                }
+            )) {
+                Label {
+                    VStack(alignment: .leading, spacing: 2) {
+                        Text("Share Analytics")
+                            .font(.body)
+                            .foregroundStyle(.primary)
+                        Text("Help improve SportsTime by sharing anonymous usage data")
+                            .font(.caption)
+                            .foregroundStyle(.secondary)
+                    }
+                } icon: {
+                    Image(systemName: "chart.bar.xaxis")
+                        .foregroundStyle(Theme.warmOrange)
+                }
+            }
+        } header: {
+            Text("Privacy")
+        } footer: {
+            Text("No personal data is collected. Analytics are fully anonymous.")
+        }
+        .listRowBackground(Theme.cardBackground(colorScheme))
+    }
+
     // MARK: - About Section
 
     private var aboutSection: some View {
@@ -573,7 +616,7 @@ struct SettingsView: View {
 
                 Button {
                     Task {
-                        await StoreManager.shared.restorePurchases()
+                        await StoreManager.shared.restorePurchases(source: "settings")
                     }
                 } label: {
                     Label("Restore Purchases", systemImage: "arrow.clockwise")
@@ -584,7 +627,7 @@ struct SettingsView: View {
         }
         .listRowBackground(Theme.cardBackground(colorScheme))
         .sheet(isPresented: $showPaywall) {
-            PaywallView()
+            PaywallView(source: "settings")
         }
     }