docs(02-01): complete auth page branding plan

- SUMMARY.md: auth pages branded with gradient bg, wordmark, Alert errors
- STATE.md: advanced progress, added decisions, updated session
- ROADMAP.md: phase 02 plan progress updated (1/2 summaries)
- REQUIREMENTS.md: AUTH-01 through AUTH-04 marked complete

.planning/phases/02-layout-and-brand-identity/02-layout-and-brand-identity-02-01-SUMMARY.md

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+---
+phase: 02-layout-and-brand-identity
+plan: "01"
+subsystem: auth-ui
+tags: [branding, auth, pastel-gradient, shadcn-alert, wordmark]
+dependency_graph:
+  requires: [frontend/src/lib/palette.ts, frontend/src/components/ui/alert.tsx]
+  provides: [branded-login-page, branded-register-page, shadcn-alert]
+  affects: [auth-flow-first-impression]
+tech_stack:
+  added: [shadcn-alert]
+  patterns: [palette-light-shades-for-bg, gradient-text-clip, inline-style-tokens]
+key_files:
+  created:
+    - frontend/src/components/ui/alert.tsx
+    - frontend/src/pages/LoginPage.test.tsx
+    - frontend/src/pages/RegisterPage.test.tsx
+  modified:
+    - frontend/src/pages/LoginPage.tsx
+    - frontend/src/pages/RegisterPage.tsx
+decisions:
+  - "Gradient background uses palette.saving.light, palette.bill.light, palette.investment.light at 135deg — three light shades for a subtle tinted-paper feel"
+  - "Wordmark gradient runs oklch(0.50 0.12 260) to oklch(0.50 0.12 320) — primary hue to pink-shifted hue"
+  - "Alert destructive replaces plain <p> error text — semantic role='alert' improves a11y and enables test assertion"
+metrics:
+  duration: "~8 minutes"
+  completed: "2026-03-11"
+  tasks_completed: 2
+  files_changed: 5
+---
+
+# Phase 02 Plan 01: Auth Page Branding Summary
+
+Pastel gradient login and register pages with a gradient text wordmark and shadcn Alert errors — auth screens transformed from plain white cards into the first branded touchpoint.
+
+## What Was Built
+
+Both LoginPage and RegisterPage received identical branding treatment:
+
+1. **Gradient background** — inline `style` with `linear-gradient(135deg, ...)` using `palette.saving.light`, `palette.bill.light`, and `palette.investment.light` light shades (~oklch 0.95-0.96 chroma 0.03-0.04). Replaces the `bg-background` Tailwind class.
+
+2. **Gradient text wordmark** — `<span data-testid="wordmark">` with CSS text-clip gradient from primary blue (hue 260) to pink-violet (hue 320) renders the app name in the card header below the page title.
+
+3. **shadcn Alert errors** — `Alert variant="destructive"` with `AlertCircle` icon and `AlertDescription` replaces the plain `<p className="text-sm text-destructive">` error display. Provides semantic `role="alert"` for a11y.
+
+4. **Card shadow** — `shadow-lg` added to Card for visual lift against the gradient background.
+
+## Tasks Completed
+
+| Task | Name | Commit | Files |
+|------|------|--------|-------|
+| 1 | Install shadcn Alert and create test scaffolds | dfd88de | alert.tsx, LoginPage.test.tsx, RegisterPage.test.tsx |
+| 2 | Brand LoginPage and RegisterPage | 381a060 | LoginPage.tsx, RegisterPage.tsx |
+
+## Verification Results
+
+- All 6 tests pass (AUTH-01 through AUTH-04): `bun vitest run src/pages/`
+- Full test suite: 35 tests pass, 0 failures
+- Production build: `bun run build` succeeds with zero errors
+
+## Deviations from Plan
+
+None — plan executed exactly as written.
+
+## Self-Check: PASSED