docs(phase-02): add validation strategy

.planning/phases/02-dashboard-charts-and-layout/02-VALIDATION.md

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+---
+phase: 2
+slug: dashboard-charts-and-layout
+status: draft
+nyquist_compliant: false
+wave_0_complete: false
+created: 2026-03-16
+---
+
+# Phase 2 — Validation Strategy
+
+> Per-phase validation contract for feedback sampling during execution.
+
+---
+
+## Test Infrastructure
+
+| Property | Value |
+|----------|-------|
+| **Framework** | None (no test framework installed) |
+| **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 |
+|---------|------|------|-------------|-----------|-------------------|-------------|--------|
+| 02-01-xx | 01 | 1 | UI-DONUT-01 | manual-only | `bun run build` | N/A | ⬜ pending |
+| 02-01-xx | 01 | 1 | UI-BAR-01 | manual-only | `bun run build` | N/A | ⬜ pending |
+| 02-01-xx | 01 | 1 | UI-HBAR-01 | manual-only | `bun run build` | N/A | ⬜ pending |
+| 02-02-xx | 02 | 1 | UI-DASH-01 | manual-only | `bun run build` | N/A | ⬜ pending |
+
+*Status: ⬜ pending · ✅ green · ❌ red · ⚠️ flaky*
+
+---
+
+## Wave 0 Requirements
+
+Existing infrastructure covers all phase requirements. No test framework installation needed — `bun run build` (TypeScript type-check + Vite build) serves as the automated quality gate.
+
+---
+
+## Manual-Only Verifications
+
+| Behavior | Requirement | Why Manual | Test Instructions |
+|----------|-------------|------------|-------------------|
+| Expense donut chart renders with center total label, active hover expansion, custom legend | UI-DONUT-01 | Visual/interactive chart rendering — no test framework installed | Open dashboard, verify donut chart shows category segments, center total, hover expands sector, legend below |
+| Vertical bar chart shows income budgeted vs actual | UI-BAR-01 | Visual chart rendering | Open dashboard with income items, verify grouped bars for budgeted (muted) vs actual (vivid) |
+| Horizontal bar chart shows spend budget vs actual by category type | UI-HBAR-01 | Visual chart rendering | Open dashboard with expense items, verify horizontal bars with red accent for over-budget |
+| 3-column chart layout, month navigation, empty states | UI-DASH-01 | Layout, navigation, and responsive behavior | Verify 3-column grid, arrow+dropdown month nav, URL params update, empty/zero states render correctly |
+
+---
+
+## 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