Mental model (show this on day 1)

[Expo App] ──Supabase JS──► Auth / Postgres / Storage (RLS)
     │
     └──Bearer──► [Express :3001] ──service role──► Supabase
                        │
                        ├── OpenAI (embed + generate)
                        └── RevenueCat (Pro checks)

Chapter 1 — Project setup, Expo Router & styling

Goal: Running Expo app with navigation shell and Uniwind.

# Sub-chapter Files
1.1 Create Expo 55 project & scripts package.json, app.json, tsconfig.json
1.2 Wire Metro + Uniwind metro.config.js, src/global.css, src/uniwind-types.d.ts
1.3 Theme & navigation tokens src/lib/theme.ts, src/lib/navigation.ts
1.4 Root layout & splash src/app/_layout.tsx
1.5 Placeholder route groups src/app/(auth)/_layout.tsx, src/app/(app)/_layout.tsx, src/app/(app)/(tabs)/_layout.tsx

Checkpoint: App opens with empty auth/app shells.

Chapter 2 — Supabase project & typed client

Goal: App can talk to Supabase; types exist for later features.

# Sub-chapter Files
2.1 Create Supabase project & env .env (EXPO_PUBLIC_SUPABASE_URL, EXPO_PUBLIC_SUPABASE_KEY), supabase/config.toml
2.2 Extensions & enums supabase/migrations/20260708043706_extensions_and_enums.sql
2.3 Supabase JS client src/utils/supabase.ts

Checkpoint: Client initializes; no auth UI yet.

Chapter 3 — Auth, session & route guards

Goal: Sign up / login / logout; protected routes.

# Sub-chapter Files
3.1 Profiles table + trigger supabase/migrations/20260708043718_profiles.sql
3.2 Auth store (Zustand) + AuthScreen src/features/auth/auth.tsx
3.3 Login & signup screens src/app/(auth)/login.tsx, src/app/(auth)/signup.tsx
3.4 Auth layout redirect (logged-in → app) src/app/(auth)/_layout.tsx
3.5 App layout guard (logged-out → login) src/app/(app)/_layout.tsx
3.6 Init session in root src/app/_layout.tsx

Checkpoint: Full auth loop; unauthenticated users can’t enter (app).

Chapter 4 — Core schema: study sets, sources & RLS

Goal: Data model + security before any UI CRUD.