docs(ui): Add UI layout refactor plan and OpenSpec changes

- Update decision-log with UI layout decisions (Feb 18, 2026)
- Update architecture with frontend layout patterns
- Update config.yaml with TDD, documentation, UI standards rules
- Create p00-api-documentation change (Scribe annotations)
- Create p01-ui-foundation change (types, stores, Lucide)
- Create p02-app-layout change (AppLayout, Sidebar, TopBar)
- Create p03-dashboard-enhancement change (PageHeader, StatCard)
- Create p04-content-patterns change (DataTable, FilterBar)
- Create p05-page-migrations change (page migrations)
- Fix E2E auth tests (11/11 passing)
- Add JWT expiry validation to dashboard guard

openspec/changes/p03-dashboard-enhancement/proposal.md

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+# Proposal: Dashboard Enhancement
+
+## Overview
+Transform the dashboard page into a data-rich overview with KPI stat cards and allocation preview, using the new layout components.
+
+## Goals
+- Create PageHeader component for consistent page titles
+- Create StatCard component for KPI display
+- Enhance dashboard with team/project/ utilization KPIs
+- Add quick links to common actions
+- Polish login page for consistency
+
+## Non-Goals
+- Allocation matrix component (done in p04)
+- Other page implementations (done in p05)
+
+## Priority
+**MEDIUM** - First "real" page using new layout
+
+## Scope
+
+### PageHeader Component
+- Page title
+- Optional description
+- Action buttons slot
+- Consistent styling
+
+### StatCard Component
+- Value display
+- Label
+- Trend indicator (up/down)
+- Icon support
+- DaisyUI stat styling
+
+### Dashboard Enhancement
+- Row of 4 stat cards (Active Projects, Team Members, Current Month Allocations, Avg Utilization)
+- Quick actions section
+- Recent activity placeholder
+
+### Login Polish
+- Center card vertically
+- Add app logo/branding
+- Improve form styling
+
+## Success Criteria
+- [ ] PageHeader component created
+- [ ] StatCard component created
+- [ ] Dashboard shows 4 KPI cards
+- [ ] Login page polished
+- [ ] All tests pass
+
+## Estimated Effort
+2-3 hours
+
+## Dependencies
+- p02-app-layout
+
+## Blocks
+- p04-content-patterns (can start in parallel)
+- p05-page-migrations