docs(phase-4): add validation strategy

.planning/phases/04-full-app-design-consistency/04-VALIDATION.md

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+---
+phase: 4
+slug: full-app-design-consistency
+status: draft
+nyquist_compliant: false
+wave_0_complete: false
+created: 2026-03-17
+---
+
+# Phase 4 — Validation Strategy
+
+> Per-phase validation contract for feedback sampling during execution.
+
+---
+
+## Test Infrastructure
+
+| Property | Value |
+|----------|-------|
+| **Framework** | None — no test framework configured |
+| **Config file** | None |
+| **Quick run command** | `bun run build` |
+| **Full suite command** | `bun run build && bun run lint` |
+| **Estimated runtime** | ~10 seconds |
+
+---
+
+## Sampling Rate
+
+- **After every task commit:** Run `bun run build`
+- **After every plan wave:** Run `bun run build && bun run lint`
+- **Before `/gsd:verify-work`:** Full suite must be green
+- **Max feedback latency:** 10 seconds
+
+---
+
+## Per-Task Verification Map
+
+| Task ID | Plan | Wave | Requirement | Test Type | Automated Command | File Exists | Status |
+|---------|------|------|-------------|-----------|-------------------|-------------|--------|
+| 04-01-01 | 01 | 1 | UI-AUTH-01 | visual/build | `bun run build` | N/A | ⬜ pending |
+| 04-01-02 | 01 | 1 | UI-DESIGN-01 | visual/build | `bun run build` | N/A | ⬜ pending |
+| 04-02-01 | 02 | 1 | UI-CATEGORIES-01 | visual/build | `bun run build` | N/A | ⬜ pending |
+| 04-02-02 | 02 | 1 | UI-TEMPLATE-01 | visual/build | `bun run build` | N/A | ⬜ pending |
+| 04-02-03 | 02 | 1 | UI-QUICKADD-01 | visual/build | `bun run build` | N/A | ⬜ pending |
+| 04-02-04 | 02 | 1 | UI-SETTINGS-01 | visual/build | `bun run build` | N/A | ⬜ pending |
+| 04-03-01 | 03 | 2 | UI-BUDGETS-01 | grep+build | `grep -r "text-green-600" src/pages/BudgetDetailPage.tsx \|\| echo "CLEAN"` | N/A | ⬜ pending |
+| 04-03-02 | 03 | 2 | UI-RESPONSIVE-01 | visual/manual | Manual browser review | N/A | ⬜ pending |
+
+*Status: ⬜ pending · ✅ green · ❌ red · ⚠️ flaky*
+
+---
+
+## Wave 0 Requirements
+
+*Existing infrastructure covers all phase requirements. This phase is 100% visual UI polish — no new logic, no new data flows. `bun run build` catches TypeScript type errors, `bun run lint` catches code quality issues.*
+
+---
+
+## Manual-Only Verifications
+
+| Behavior | Requirement | Why Manual | Test Instructions |
+|----------|-------------|------------|-------------------|
+| All 9 pages use PageShell | UI-DESIGN-01 | Visual layout consistency | Navigate each page, verify consistent header with title |
+| Auth pages show muted bg + logo + accent card | UI-AUTH-01 | Visual design | Open /login and /register, verify background and card |
+| Category group headers have accent styling | UI-CATEGORIES-01 | Visual design | Open /categories, verify left-border accent or enhanced dots |
+| BudgetDetail semantic tokens | UI-BUDGETS-01 | Color correctness | Open budget detail, verify red/green uses semantic tokens |
+| No jarring visual discontinuity | UI-RESPONSIVE-01 | Cross-page consistency | Navigate between all pages rapidly |
+| German locale fully translated | UI-DESIGN-01 | i18n completeness | Switch to German in settings, visit every page |
+
+---
+
+## Validation Sign-Off
+
+- [ ] All tasks have `<automated>` verify or Wave 0 dependencies
+- [ ] Sampling continuity: no 3 consecutive tasks without automated verify
+- [ ] Wave 0 covers all MISSING references
+- [ ] No watch-mode flags
+- [ ] Feedback latency < 10s
+- [ ] `nyquist_compliant: true` set in frontmatter
+
+**Approval:** pending