feat: HSE dashboard with incident stats by type and site

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AWxyMibCuGGtSQSqfajDQ7

tests/components/dashboard/stat-card.test.tsx

@@ -0,0 +1,16 @@
+import { describe, it, expect } from 'vitest'
+import { render, screen } from '@testing-library/react'
+import { StatCard } from '@/components/dashboard/stat-card'
+
+describe('StatCard', () => {
+  it('renders label and value', () => {
+    render(<StatCard label="Total Incidents" value={42} />)
+    expect(screen.getByText('Total Incidents')).toBeTruthy()
+    expect(screen.getByText('42')).toBeTruthy()
+  })
+
+  it('renders optional sub text', () => {
+    render(<StatCard label="Open" value={12} sub="awaiting action" />)
+    expect(screen.getByText('awaiting action')).toBeTruthy()
+  })
+})