feat: add testing infrastructure — Vitest, Playwright, CI, git hooks

Add comprehensive testing covering 420 unit/handler tests across 24 Vitest
files, 9 Playwright E2E specs, accessibility scans, and visual regression.
Includes GitHub Actions CI, Husky pre-push hook, and TESTING.md docs.

e2e/member-dashboard.spec.js

@@ -0,0 +1,35 @@
+import { test, expect } from './helpers/fixtures.js'
+
+test.describe('Member dashboard', () => {
+  test('dashboard loads for authenticated user', async ({ adminPage }) => {
+    await adminPage.goto('/member/dashboard')
+
+    await expect(adminPage.getByText('Welcome back')).toBeVisible({ timeout: 10000 })
+  })
+
+  test('shows navigation links', async ({ adminPage }) => {
+    await adminPage.goto('/member/dashboard')
+
+    // Wait for dashboard content to render
+    await expect(adminPage.getByText('Welcome back')).toBeVisible({ timeout: 10000 })
+
+    // Verify quick action links are present
+    await expect(adminPage.getByText('Update your profile')).toBeVisible()
+    await expect(adminPage.getByText('Browse members')).toBeVisible()
+    await expect(adminPage.getByText('Manage account')).toBeVisible()
+  })
+
+  test('unauthenticated shows sign-in prompt', async ({ browser }) => {
+    const context = await browser.newContext()
+    const page = await context.newPage()
+
+    await page.goto('/member/dashboard')
+
+    // Should show the sign-in required message or a login modal
+    await expect(
+      page.getByText('Sign in required').or(page.getByText('Sign in to your dashboard'))
+    ).toBeVisible({ timeout: 10000 })
+
+    await context.close()
+  })
+})