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/program-browse.yaml

@@ -0,0 +1,42 @@
+# Program Browsing Test
+# Tests navigation through programs from home screen
+# Prerequisite: User must have completed onboarding
+
+appId: com.millianlmx.tabatafit
+name: Program Browsing
+
+---
+# Verify home screen loaded
+- assertVisible: "program-card-upper-body"
+- assertVisible: "program-card-lower-body"
+- assertVisible: "program-card-full-body"
+
+# Tap Upper Body program
+- tapOn: "program-upper-body-cta"
+
+# Wait for program detail screen
+- assertVisible:
+    text: ".*Upper Body.*"
+    timeout: 5000
+
+# Navigate back
+- back
+
+# Tap Lower Body program
+- assertVisible: "program-card-lower-body"
+- tapOn: "program-lower-body-cta"
+- assertVisible:
+    text: ".*Lower Body.*"
+    timeout: 5000
+- back
+
+# Tap Full Body program
+- assertVisible: "program-card-full-body"
+- tapOn: "program-full-body-cta"
+- assertVisible:
+    text: ".*Full Body.*"
+    timeout: 5000
+- back
+
+# Verify we're back on home
+- assertVisible: "program-card-upper-body"