feat: explore tab, React Query data layer, programs, sync, analytics, testing infrastructure

- Replace browse tab with Supabase-connected explore tab with filters
- Add React Query for data fetching with loading states
- Add 3 structured programs with weekly progression
- Add Supabase anonymous auth sync service
- Add PostHog analytics with screen tracking and events
- Add comprehensive test strategy (Vitest + Maestro E2E)
- Add RevenueCat subscription system with DEV simulation
- Add i18n translations for new screens (EN/FR/DE/ES)
- Add data deletion modal, sync consent modal
- Add assessment screen and program routes
- Add GitHub Actions CI workflow
- Update activity store with sync integration

app/complete/[id].tsx

@@ -3,7 +3,7 @@
  * Celebration with real data from activity store
  */
 
-import { useRef, useEffect, useMemo } from 'react'
+import { useRef, useEffect, useMemo, useState } from 'react'
 import {
   View,
   Text as RNText,
@@ -23,9 +23,12 @@ import * as Sharing from 'expo-sharing'
 import { useTranslation } from 'react-i18next'
 
 import { useHaptics } from '@/src/shared/hooks'
-import { useActivityStore } from '@/src/shared/stores'
+import { useActivityStore, useUserStore } from '@/src/shared/stores'
 import { getWorkoutById, getPopularWorkouts } from '@/src/shared/data'
 import { useTranslatedWorkout, useTranslatedWorkouts } from '@/src/shared/data/useTranslatedData'
+import { SyncConsentModal } from '@/src/shared/components/SyncConsentModal'
+import { enableSync } from '@/src/shared/services/sync'
+import type { WorkoutSessionData } from '@/src/shared/types'
 
 import { useThemeColors, BRAND } from '@/src/shared/theme'
 import type { ThemeColors } from '@/src/shared/theme/types'
@@ -270,6 +273,10 @@ export default function WorkoutCompleteScreen() {
   const history = useActivityStore((s) => s.history)
   const recentWorkouts = history.slice(0, 1)
 
+  // Sync consent modal state
+  const [showSyncPrompt, setShowSyncPrompt] = useState(false)
+  const { profile, setSyncStatus } = useUserStore()
+
   // Get the most recent result for this workout
   const latestResult = recentWorkouts[0]
   const resultCalories = latestResult?.calories ?? workout?.calories ?? 45
@@ -299,6 +306,54 @@ export default function WorkoutCompleteScreen() {
     router.push(`/workout/${workoutId}`)
   }
 
+  // Check if we should show sync prompt (after first workout for premium users)
+  useEffect(() => {
+    if (profile.syncStatus === 'prompt-pending') {
+      // Wait a moment for the user to see their results first
+      const timer = setTimeout(() => {
+        setShowSyncPrompt(true)
+      }, 1500)
+      return () => clearTimeout(timer)
+    }
+  }, [profile.syncStatus])
+
+  const handleSyncAccept = async () => {
+    setShowSyncPrompt(false)
+
+    // Prepare data for sync
+    const profileData = {
+      name: profile.name,
+      fitnessLevel: profile.fitnessLevel,
+      goal: profile.goal,
+      weeklyFrequency: profile.weeklyFrequency,
+      barriers: profile.barriers,
+      onboardingCompletedAt: new Date().toISOString(),
+    }
+
+    // Get all workout history for retroactive sync
+    const workoutHistory: WorkoutSessionData[] = history.map((w) => ({
+      workoutId: w.workoutId,
+      completedAt: new Date(w.completedAt).toISOString(),
+      durationSeconds: w.durationMinutes * 60,
+      caloriesBurned: w.calories,
+    }))
+
+    // Enable sync
+    const result = await enableSync(profileData, workoutHistory)
+
+    if (result.success) {
+      setSyncStatus('synced', result.userId || null)
+    } else {
+      // Show error - sync failed
+      setSyncStatus('never-synced')
+    }
+  }
+
+  const handleSyncDecline = () => {
+    setShowSyncPrompt(false)
+    setSyncStatus('never-synced') // Reset so we don't ask again
+  }
+
   // Simulate percentile
   const burnBarPercentile = Math.min(95, Math.max(40, Math.round((resultCalories / (workout?.calories ?? 45)) * 70)))
 
@@ -385,6 +440,13 @@ export default function WorkoutCompleteScreen() {
           </PrimaryButton>
         </View>
       </View>
+
+      {/* Sync Consent Modal */}
+      <SyncConsentModal
+        visible={showSyncPrompt}
+        onAccept={handleSyncAccept}
+        onDecline={handleSyncDecline}
+      />
     </View>
   )
 }