test(e2e,unit): add navigation edge cases and component coverage

- Add missing-paths E2E spec for desktop/mobile navigation and contrast
- Add local Playwright config for dev server testing
- Expand unit tests for CMS data server, products, contact and UI components
- Adjust jest config for new test patterns

e2e/playwright.local.config.ts

@@ -0,0 +1,27 @@
+import { defineConfig, devices } from '@playwright/test';
+
+export default defineConfig({
+  testDir: './',
+  fullyParallel: true,
+  forbidOnly: !!process.env.CI,
+  retries: 0,
+  workers: 1,
+  reporter: [['list', { printSteps: true }]],
+  use: {
+    baseURL: process.env.E2E_BASE_URL || 'http://localhost:3000',
+    trace: 'on-first-retry',
+    screenshot: 'only-on-failure',
+    ignoreHTTPSErrors: true,
+    actionTimeout: 15000,
+    navigationTimeout: 30000,
+  },
+  expect: {
+    timeout: 15000,
+  },
+  projects: [
+    {
+      name: 'chromium',
+      use: { ...devices['Desktop Chrome'] },
+    },
+  ],
+});