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/admin/collections.tsx

@@ -0,0 +1,201 @@
+import { useState } from 'react'
+import {
+  View,
+  Text,
+  ScrollView,
+  TouchableOpacity,
+  StyleSheet,
+  ActivityIndicator,
+  Alert,
+} from 'react-native'
+import { useRouter } from 'expo-router'
+import { useCollections } from '../../src/shared/hooks/useSupabaseData'
+import { adminService } from '../../src/admin/services/adminService'
+import type { Collection } from '../../src/shared/types'
+
+export default function AdminCollectionsScreen() {
+  const router = useRouter()
+  const { collections, loading, refetch } = useCollections()
+  const [updatingId, setUpdatingId] = useState<string | null>(null)
+
+  const handleDelete = (collection: Collection) => {
+    Alert.alert(
+      'Delete Collection',
+      `Are you sure you want to delete "${collection.title}"?`,
+      [
+        { text: 'Cancel', style: 'cancel' },
+        { 
+          text: 'Delete', 
+          style: 'destructive',
+          onPress: async () => {
+            Alert.alert('Info', 'Collection deletion not yet implemented')
+          }
+        },
+      ]
+    )
+  }
+
+  if (loading) {
+    return (
+      <View style={[styles.container, styles.centered]}>
+        <ActivityIndicator size="large" color="#FF6B35" />
+      </View>
+    )
+  }
+
+  return (
+    <View style={styles.container}>
+      <View style={styles.header}>
+        <TouchableOpacity onPress={() => router.back()} style={styles.backButton}>
+          <Text style={styles.backText}>← Back</Text>
+        </TouchableOpacity>
+        <Text style={styles.title}>Collections</Text>
+        <TouchableOpacity style={styles.addButton}>
+          <Text style={styles.addButtonText}>+ Add</Text>
+        </TouchableOpacity>
+      </View>
+
+      <ScrollView style={styles.content}>
+        {collections.map((collection) => (
+          <View key={collection.id} style={styles.collectionCard}>
+            <View style={styles.iconContainer}>
+              <Text style={styles.icon}>{collection.icon}</Text>
+            </View>
+            
+            <View style={styles.collectionInfo}>
+              <Text style={styles.collectionTitle}>{collection.title}</Text>
+              <Text style={styles.collectionDescription}>{collection.description}</Text>
+              <Text style={styles.collectionMeta}>
+                {collection.workoutIds.length} workouts
+              </Text>
+            </View>
+            
+            <View style={styles.actions}>
+              <TouchableOpacity style={styles.editButton}>
+                <Text style={styles.editText}>Edit</Text>
+              </TouchableOpacity>
+              <TouchableOpacity 
+                style={[styles.deleteButton, updatingId === collection.id && styles.disabledButton]}
+                onPress={() => handleDelete(collection)}
+                disabled={updatingId === collection.id}
+              >
+                <Text style={styles.deleteText}>
+                  {updatingId === collection.id ? '...' : 'Delete'}
+                </Text>
+              </TouchableOpacity>
+            </View>
+          </View>
+        ))}
+      </ScrollView>
+    </View>
+  )
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    backgroundColor: '#000',
+  },
+  centered: {
+    justifyContent: 'center',
+    alignItems: 'center',
+  },
+  header: {
+    flexDirection: 'row',
+    justifyContent: 'space-between',
+    alignItems: 'center',
+    padding: 20,
+    paddingTop: 60,
+    borderBottomWidth: 1,
+    borderBottomColor: '#1C1C1E',
+  },
+  backButton: {
+    padding: 8,
+  },
+  backText: {
+    color: '#FF6B35',
+    fontSize: 16,
+  },
+  title: {
+    fontSize: 20,
+    fontWeight: 'bold',
+    color: '#fff',
+  },
+  addButton: {
+    backgroundColor: '#FF6B35',
+    paddingHorizontal: 16,
+    paddingVertical: 8,
+    borderRadius: 8,
+  },
+  addButtonText: {
+    color: '#000',
+    fontWeight: 'bold',
+  },
+  content: {
+    flex: 1,
+    padding: 16,
+  },
+  collectionCard: {
+    backgroundColor: '#1C1C1E',
+    borderRadius: 12,
+    padding: 16,
+    marginBottom: 12,
+    flexDirection: 'row',
+    alignItems: 'center',
+  },
+  iconContainer: {
+    width: 48,
+    height: 48,
+    borderRadius: 24,
+    backgroundColor: '#2C2C2E',
+    justifyContent: 'center',
+    alignItems: 'center',
+    marginRight: 12,
+  },
+  icon: {
+    fontSize: 24,
+  },
+  collectionInfo: {
+    flex: 1,
+  },
+  collectionTitle: {
+    fontSize: 16,
+    fontWeight: 'bold',
+    color: '#fff',
+    marginBottom: 4,
+  },
+  collectionDescription: {
+    fontSize: 14,
+    color: '#999',
+    marginBottom: 4,
+  },
+  collectionMeta: {
+    fontSize: 12,
+    color: '#666',
+  },
+  actions: {
+    flexDirection: 'row',
+    gap: 8,
+  },
+  editButton: {
+    backgroundColor: '#2C2C2E',
+    paddingHorizontal: 12,
+    paddingVertical: 8,
+    borderRadius: 6,
+  },
+  editText: {
+    color: '#5AC8FA',
+  },
+  deleteButton: {
+    backgroundColor: '#2C2C2E',
+    paddingHorizontal: 12,
+    paddingVertical: 8,
+    borderRadius: 6,
+  },
+  disabledButton: {
+    opacity: 0.5,
+  },
+  deleteText: {
+    color: '#FF3B30',
+  },
+})