Add comprehensive test coverage for dashboard components:
- Dashboard.test.tsx: Main component integration tests
- WelcomeHeader.test.tsx: User greeting and time-based messages
- DashboardQuickStats.test.tsx: Stats cards rendering and links
- RecentProjects.test.tsx: Project cards grid and navigation
- PendingApprovals.test.tsx: Approval items and actions
- EmptyState.test.tsx: New user onboarding experience
46 tests covering rendering, interactions, and edge cases.
