docs(01-04): complete Google OAuth plan

Tasks completed: 3/3
- Create Google Sign-In button component
- Add Google button to login and register pages
- Document Google OAuth setup process

SUMMARY: .planning/phases/01-foundation-auth/01-04-SUMMARY.md

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.planning/STATE.md

@@ -10,28 +10,28 @@ See: .planning/PROJECT.md (updated 2026-01-30)
 ## Current Position
 
 Phase: 1 of 10 (Foundation & Auth)
-Plan: 1 of 6 (Project Setup - COMPLETE)
+Plan: 4 of 6 (Google OAuth - COMPLETE)
 Status: In progress
-Last activity: 2026-01-31 — Completed 01-01-PLAN.md (Project Setup)
+Last activity: 2026-01-31 — Completed 01-04-PLAN.md (Google OAuth)
 
-Progress: [█░░░░░░░░░] ~2% (1/~60 plans estimated)
+Progress: [███░░░░░░░] ~5% (3/~60 plans estimated)
 
 ## Performance Metrics
 
 **Velocity:**
-- Total plans completed: 1
-- Average duration: 8min
-- Total execution time: 0.13 hours
+- Total plans completed: 3
+- Average duration: 6min
+- Total execution time: 0.28 hours
 
 **By Phase:**
 
 | Phase | Plans | Total | Avg/Plan |
 |-------|-------|-------|----------|
-| 01-foundation-auth | 1 | 8min | 8min |
+| 01-foundation-auth | 3 | 17min | 5.7min |
 
 **Recent Trend:**
-- Last 5 plans: 01-01 (8min)
-- Trend: N/A (need more data)
+- Last 5 plans: 01-01 (8min), 01-02 (5min), 01-04 (4min)
+- Trend: Improving (faster execution)
 
 *Updated after each plan completion*
 
@@ -50,6 +50,8 @@ Recent decisions affecting current work:
 - 01-01: Used @supabase/ssr instead of deprecated auth-helpers-nextjs
 - 01-01: Async cookies() pattern for Next.js 15+ Server Components
 - 01-01: Placeholder env values - real Supabase project created at deploy time
+- 01-04: Google button above email form (faster option first)
+- 01-04: Created full auth pages in parallel plan execution
 
 ### Pending Todos
 
@@ -64,9 +66,14 @@ None yet.
 - Phase 6: Job queue reliability critical — BullMQ on Redis, not setTimeout
 - Phase 10: WhatsApp Business verification takes 2-4 weeks — start process early
 
+**Plan coordination note:**
+- 01-03 and 01-04 were designed as parallel plans (wave 2)
+- 01-04 executed first, created login/register pages
+- When 01-03 runs, it may need to handle already-existing files
+
 ## Session Continuity
 
 Last session: 2026-01-31
-Stopped at: Completed 01-01-PLAN.md (Project Setup)
+Stopped at: Completed 01-04-PLAN.md (Google OAuth)
 Resume file: None
-Next step: Execute 01-02-PLAN.md (Database Schema)
+Next step: Execute 01-03-PLAN.md (Auth Forms) or 01-05-PLAN.md (Middleware)

.planning/phases/01-foundation-auth/01-04-SUMMARY.md

@@ -0,0 +1,144 @@
+---
+phase: 01-foundation-auth
+plan: 04
+subsystem: auth
+tags: [google, oauth, supabase, social-login, react]
+
+# Dependency graph
+requires:
+  - phase: 01-01
+    provides: Supabase client utilities
+  - phase: 01-02
+    provides: Database schema with profiles table
+provides:
+  - GoogleSignInButton component with signInWithOAuth
+  - Login page with Google OAuth + email form
+  - Register page with Google OAuth + email form
+  - Google OAuth setup documentation
+affects: [01-05-middleware, 01-06-protected-routes]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - "Google OAuth via Supabase signInWithOAuth"
+    - "Social login button above email form with 'oppure' divider"
+    - "Client-side OAuth redirect handling"
+
+key-files:
+  created:
+    - src/components/auth/google-button.tsx
+    - src/components/auth/login-form.tsx
+    - src/components/auth/register-form.tsx
+    - src/app/(auth)/layout.tsx
+    - src/app/(auth)/login/page.tsx
+    - src/app/(auth)/register/page.tsx
+    - src/components/ui/input.tsx
+    - docs/GOOGLE_OAUTH_SETUP.md
+  modified:
+    - src/lib/utils.ts
+    - src/components/ui/button.tsx
+    - src/components/ui/card.tsx
+
+key-decisions:
+  - "Google button placed above email form (faster option first)"
+  - "Created full login/register pages since 01-03 not yet executed (parallel wave)"
+  - "Client-side forms instead of Server Actions (simpler for OAuth flow)"
+
+patterns-established:
+  - "Social login pattern: GoogleSignInButton component with signInWithOAuth"
+  - "Auth page pattern: Card with Google button + 'oppure' divider + email form"
+  - "Italian text: 'Accedi con Google', 'oppure', 'Registrati'"
+
+# Metrics
+duration: 4min
+completed: 2026-01-31
+---
+
+# Phase 01 Plan 04: Google OAuth Summary
+
+**Google OAuth login button with signInWithOAuth, integrated into login and register pages with Italian text and setup documentation**
+
+## Performance
+
+- **Duration:** 4 min
+- **Started:** 2026-01-31T04:04:21Z
+- **Completed:** 2026-01-31T04:08:41Z
+- **Tasks:** 3
+- **Files created:** 11
+
+## Accomplishments
+
+- Created GoogleSignInButton component with Google icon SVG and signInWithOAuth
+- Built complete login and register pages with Google button prominently above email form
+- Added "oppure" divider to separate social login from email form
+- Created comprehensive Google OAuth setup documentation
+- All UI text in Italian per project requirement
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Create Google Sign-In button component** - `1d454d2` (feat)
+2. **Task 2: Add Google button to login and register pages** - `dcbd7e8` (feat)
+3. **Task 3: Document Google OAuth setup process** - `bd0df40` (docs)
+
+## Files Created
+
+- `src/lib/utils.ts` - cn() utility for class name merging
+- `src/components/ui/button.tsx` - Button component with variants
+- `src/components/ui/card.tsx` - Card component with Header, Title, Content
+- `src/components/ui/input.tsx` - Input component with error state
+- `src/components/auth/google-button.tsx` - Google OAuth button
+- `src/components/auth/login-form.tsx` - Email/password login form
+- `src/components/auth/register-form.tsx` - Registration form with validation
+- `src/app/(auth)/layout.tsx` - Centered auth layout
+- `src/app/(auth)/login/page.tsx` - Login page with Google + email
+- `src/app/(auth)/register/page.tsx` - Register page with Google + email
+- `docs/GOOGLE_OAUTH_SETUP.md` - Setup guide for Google Cloud + Supabase
+
+## Decisions Made
+
+1. **Google button above email form** - Faster login option should be more prominent
+2. **Created full auth pages** - Plan runs parallel with 01-03 which also creates these pages; created complete pages with Google integration since 01-03 not yet executed
+3. **Client-side forms** - Used client-side state management for forms since OAuth requires client-side redirect handling; Server Actions can be added later if needed
+
+## Deviations from Plan
+
+### Auto-fixed Issues
+
+**1. [Rule 3 - Blocking] Created UI components and forms not in plan scope**
+- **Found during:** Task 2 (Add Google button to pages)
+- **Issue:** Login/register pages didn't exist (01-03 not yet executed), and plan specifies "If they don't exist, create them with the Google button included"
+- **Fix:** Created full auth pages including layout, forms, and UI components
+- **Files created:** src/components/ui/input.tsx, src/components/auth/login-form.tsx, src/components/auth/register-form.tsx, src/app/(auth)/layout.tsx
+- **Verification:** Build passes, pages render correctly
+- **Committed in:** dcbd7e8
+
+---
+
+**Total deviations:** 1 auto-fixed (blocking - parallel plan dependency)
+**Impact on plan:** Extended scope to create complete auth UI since parallel plan 01-03 not yet executed. When 01-03 runs, it may need to skip or modify already-created files.
+
+## Issues Encountered
+
+None - plan executed smoothly.
+
+## User Setup Required
+
+**External services require manual configuration.** See `docs/GOOGLE_OAUTH_SETUP.md` for:
+- Google Cloud Console OAuth client ID creation
+- Supabase Dashboard Google provider configuration
+- Testing steps and troubleshooting guide
+
+## Next Phase Readiness
+
+- Google OAuth button ready and functional
+- Login and register pages complete
+- Auth callback at /auth/callback expected to exist (from 01-01)
+- Middleware for session refresh needed (01-05)
+- Protected routes needed for /dashboard redirect (01-06)
+
+---
+*Phase: 01-foundation-auth*
+*Completed: 2026-01-31*