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

vitest.config.ts

@@ -0,0 +1,52 @@
+import { defineConfig } from 'vitest/config'
+import { resolve } from 'path'
+
+export default defineConfig({
+  test: {
+    globals: true,
+    environment: 'jsdom',
+    setupFiles: ['./src/__tests__/setup.ts'],
+    include: ['src/**/*.{test,spec}.{ts,tsx}'],
+    exclude: [
+      'src/__tests__/components/rendering/**',
+      'src/__tests__/integration/*.render.test.tsx',
+      'node_modules',
+    ],
+    coverage: {
+      provider: 'v8',
+      reporter: ['text', 'json', 'json-summary', 'html', 'lcov'],
+      include: ['src/**/*.{ts,tsx}'],
+      exclude: [
+        'src/**/__tests__/**',
+        'src/**/*.d.ts',
+        'src/**/*.test.{ts,tsx}',
+        'src/**/*.spec.{ts,tsx}',
+        'src/**/index.ts',
+        'src/**/types.ts',
+        'src/**/CLAUDE.md',
+        'src/shared/data/dataService.ts',
+        'src/shared/data/useTranslatedData.ts',
+        'src/shared/services/sync.ts',
+        'src/shared/services/analytics.ts',
+      ],
+      thresholds: {
+        'src/shared/stores/**': { lines: 85, branches: 65, functions: 90, statements: 85 },
+        'src/shared/services/purchases.ts': { lines: 100 },
+        'src/shared/services/sync.ts': { lines: 80 },
+        'src/shared/services/analytics.ts': { lines: 80 },
+        'src/shared/data/achievements.ts': { lines: 100 },
+        'src/shared/data/collections.ts': { lines: 100 },
+        'src/shared/data/programs.ts': { lines: 90 },
+        'src/shared/data/trainers.ts': { lines: 100 },
+        'src/shared/data/workouts.ts': { lines: 100 },
+      },
+    },
+    testTimeout: 10000,
+    hookTimeout: 10000,
+  },
+  resolve: {
+    alias: {
+      '@': resolve(__dirname, '.'),
+    },
+  },
+})