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

supabase/schema.sql

@@ -235,3 +235,77 @@ ON CONFLICT DO NOTHING;
 -- SELECT id, email, 'admin' 
 -- FROM auth.users 
 -- WHERE email = 'your-email@example.com';
+
+-- ============================================================
+-- USER SYNC TABLES (Premium Feature - Anonymous Auth)
+-- ============================================================
+
+-- User profiles (created after opt-in to sync for personalization)
+CREATE TABLE IF NOT EXISTS public.user_profiles (
+  id UUID PRIMARY KEY REFERENCES auth.users(id) ON DELETE CASCADE,
+  email TEXT,
+  name TEXT NOT NULL,
+  fitness_level TEXT NOT NULL,
+  goal TEXT NOT NULL,
+  weekly_frequency INTEGER NOT NULL,
+  barriers JSONB DEFAULT '[]',
+  is_anonymous BOOLEAN DEFAULT true,
+  sync_enabled BOOLEAN DEFAULT true,
+  subscription_plan TEXT DEFAULT 'premium-yearly',
+  onboarding_completed_at TIMESTAMP WITH TIME ZONE,
+  created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+  updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
+);
+
+-- Workout sessions (synced history for personalization)
+CREATE TABLE IF NOT EXISTS public.workout_sessions (
+  id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+  user_id UUID NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
+  workout_id UUID NOT NULL REFERENCES public.workouts(id),
+  completed_at TIMESTAMP WITH TIME ZONE NOT NULL,
+  duration_seconds INTEGER,
+  calories_burned INTEGER,
+  feeling_rating INTEGER CHECK (feeling_rating BETWEEN 1 AND 5),
+  created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
+);
+
+-- User preferences for personalization
+CREATE TABLE IF NOT EXISTS public.user_preferences (
+  id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+  user_id UUID NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
+  preferred_categories TEXT[] DEFAULT '{}',
+  preferred_trainers TEXT[] DEFAULT '{}',
+  preferred_durations INTEGER[] DEFAULT '{}',
+  difficulty_preference TEXT DEFAULT 'matched',
+  created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+  updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+  UNIQUE(user_id)
+);
+
+-- Indexes for performance
+CREATE INDEX IF NOT EXISTS idx_workout_sessions_user_id ON public.workout_sessions(user_id);
+CREATE INDEX IF NOT EXISTS idx_workout_sessions_completed_at ON public.workout_sessions(completed_at DESC);
+CREATE INDEX IF NOT EXISTS idx_user_profiles_email ON public.user_profiles(email);
+
+-- RLS Policies for user data protection
+ALTER TABLE public.user_profiles ENABLE ROW LEVEL SECURITY;
+ALTER TABLE public.workout_sessions ENABLE ROW LEVEL SECURITY;
+ALTER TABLE public.user_preferences ENABLE ROW LEVEL SECURITY;
+
+CREATE POLICY "Users manage own profile" 
+  ON public.user_profiles FOR ALL USING (id = auth.uid());
+
+CREATE POLICY "Users manage own sessions" 
+  ON public.workout_sessions FOR ALL USING (user_id = auth.uid());
+
+CREATE POLICY "Users manage own preferences" 
+  ON public.user_preferences FOR ALL USING (user_id = auth.uid());
+
+-- Triggers for updated_at
+CREATE TRIGGER update_user_profiles_updated_at 
+  BEFORE UPDATE ON public.user_profiles 
+  FOR EACH ROW EXECUTE FUNCTION public.update_updated_at_column();
+
+CREATE TRIGGER update_user_preferences_updated_at 
+  BEFORE UPDATE ON public.user_preferences 
+  FOR EACH ROW EXECUTE FUNCTION public.update_updated_at_column();