Implement Login page with PocketBase auth (P1.6)

Add functional login page with email/password form:
- Client component with controlled form inputs
- PocketBase authentication integration
- Error handling with visual feedback
- Loading states (disabled inputs, button text change)
- Form validation (prevents empty submissions)
- Redirect to dashboard on successful login

Test infrastructure improvements:
- Add @testing-library/jest-dom for DOM matchers
- Add global test setup with cleanup between tests
- Configure vitest.config.ts with setupFiles

14 new tests covering form rendering, auth flow, error
handling, and validation.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

IMPLEMENTATION_PLAN.md

@@ -40,11 +40,11 @@ This file is maintained by Ralph. Run `./ralph-sandbox.sh plan 3` to generate ta
 | POST /api/cron/garmin-sync | 501 | Has CRON_SECRET auth check, core logic TODO |
 | POST /api/cron/notifications | 501 | Has CRON_SECRET auth check, core logic TODO |
 
-### Pages (7 total, ALL placeholders)
+### Pages (7 total)
 | Page | Status | Notes |
 |------|--------|-------|
 | Dashboard (`/`) | Placeholder | Needs real data integration |
-| Login (`/login`) | Placeholder | Needs PocketBase auth integration |
+| Login (`/login`) | **COMPLETE** | Email/password form with auth, error handling, loading states |
 | Settings (`/settings`) | Placeholder | Needs form implementation |
 | Settings/Garmin (`/settings/garmin`) | Placeholder | Needs token management UI |
 | Calendar (`/calendar`) | Placeholder | Needs MonthView integration |
@@ -75,6 +75,7 @@ This file is maintained by Ralph. Run `./ralph-sandbox.sh plan 3` to generate ta
 | `src/app/api/cycle/current/route.test.ts` | **EXISTS** - 10 tests (GET current cycle, auth, all phases, rollover, custom lengths) |
 | `src/app/api/today/route.test.ts` | **EXISTS** - 22 tests (daily snapshot, auth, decision, overrides, phases, nutrition, biometrics) |
 | `src/app/api/overrides/route.test.ts` | **EXISTS** - 14 tests (POST/DELETE overrides, auth, validation, type checks) |
+| `src/app/login/page.test.tsx` | **EXISTS** - 14 tests (form rendering, auth flow, error handling, validation) |
 | `src/lib/nutrition.test.ts` | **MISSING** |
 | `src/lib/email.test.ts` | **MISSING** |
 | `src/lib/ics.test.ts` | **MISSING** |
@@ -210,12 +211,15 @@ Minimum viable product - app can be used for daily decisions.
 - **Why:** Emergency overrides are critical for flare days
 - **Depends On:** P0.1, P0.2, P0.3
 
-### P1.6: Login Page Implementation
-- [ ] Functional login form with PocketBase auth
+### P1.6: Login Page Implementation ✅ COMPLETE
+- [x] Functional login form with PocketBase auth
 - **Files:**
-  - `src/app/login/page.tsx` - Form with email/password, error handling, redirect
+  - `src/app/login/page.tsx` - Client component with email/password form, error handling, loading states, redirect
 - **Tests:**
-  - E2E test: valid login redirects to dashboard, invalid shows error
+  - `src/app/login/page.test.tsx` - 14 tests covering rendering, form submission, auth flow, error handling, validation
+- **Infrastructure Added:**
+  - `src/test-setup.ts` - Global test setup with @testing-library/jest-dom and cleanup
+  - Updated `vitest.config.ts` to include setupFiles
 - **Why:** Users need to authenticate to use the app
 - **Depends On:** P0.1
 
@@ -507,6 +511,12 @@ P2.14 Mini calendar
 - [x] **POST /api/overrides** - Adds override to user.activeOverrides array, 14 tests (P1.5)
 - [x] **DELETE /api/overrides** - Removes override from user.activeOverrides array, 14 tests (P1.5)
 
+### Pages
+- [x] **Login Page** - Email/password form with PocketBase auth, error handling, loading states, redirect, 14 tests (P1.6)
+
+### Test Infrastructure
+- [x] **test-setup.ts** - Global test setup with @testing-library/jest-dom matchers and cleanup
+
 ---
 
 ## Discovered Issues