feat: Apple Watch app + Paywall + Privacy Policy + rebranding

## Major Features
- Apple Watch companion app (6 phases complete)
  - WatchConnectivity iPhone ↔ Watch
  - HealthKit integration (HR, calories)
  - SwiftUI premium UI
  - 9 complication types
  - Always-On Display support

- Paywall screen with RevenueCat integration
- Privacy Policy screen
- App rebranding: tabatago → TabataFit
- Bundle ID: com.millianlmx.tabatafit

## Changes
- New: ios/TabataFit Watch App/ (complete Watch app)
- New: app/paywall.tsx (subscription UI)
- New: app/privacy.tsx (privacy policy)
- New: src/features/watch/ (Watch sync hooks)
- New: admin-web/ (admin dashboard)
- Updated: app.json, package.json (branding)
- Updated: profile.tsx (paywall + privacy links)
- Updated: i18n translations (EN/FR/DE/ES)
- New: app icon 1024x1024

## Watch App Files
- TabataFitWatchApp.swift (entry point)
- ContentView.swift (premium UI)
- HealthKitManager.swift (HR + calories)
- WatchSessionManager.swift (communication)
- Complications/ (WidgetKit)
- UserDefaults+Shared.swift (data sharing)

app/_layout.tsx

@@ -28,7 +28,7 @@ import { ThemeProvider, useThemeColors } from '@/src/shared/theme'
 import { useUserStore } from '@/src/shared/stores'
 import { useNotifications } from '@/src/shared/hooks'
 import { initializePurchases } from '@/src/shared/services/purchases'
-import { initializeAnalytics, getPostHogClient } from '@/src/shared/services/analytics'
+import { initializeAnalytics, getPostHogClient, trackScreen } from '@/src/shared/services/analytics'
 
 Notifications.setNotificationHandler({
   handleNotification: async () => ({
@@ -105,7 +105,7 @@ function RootLayoutInner() {
             <Stack.Screen
               name="workout/[id]"
               options={{
-                animation: 'slide_from_bottom',
+                animation: 'slide_from_right',
               }}
             />
             <Stack.Screen
@@ -137,13 +137,21 @@ function RootLayoutInner() {
       </View>
   )
 
-  // Skip PostHogProvider in dev to avoid SDK errors without a real API key
-  if (__DEV__) {
+  const posthogClient = getPostHogClient()
+
+  // Only wrap with PostHogProvider if client is initialized
+  if (!posthogClient) {
     return content
   }
 
   return (
-    <PostHogProvider client={getPostHogClient() ?? undefined} autocapture={{ captureScreens: true }}>
+    <PostHogProvider
+      client={posthogClient}
+      autocapture={{
+        captureScreens: true,
+        captureTouches: true,
+      }}
+    >
       {content}
     </PostHogProvider>
   )