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

.maestro/flows/reset-state.yaml

@@ -0,0 +1,17 @@
+# Reset App State Helper
+# Use this to reset the app to a fresh state for testing
+
+appId: com.millianlmx.tabatafit
+name: Reset App State
+
+---
+# Kill the app
+- killApp
+
+# Clear app data (iOS Simulator)
+# Note: On Android, use: adb shell pm clear com.millianlmx.tabatafit
+- launchApp:
+    clearState: true
+
+# App should start at onboarding
+- assertVisible: "onboarding-problem-cta"