feat(14-01): add desktop Playwright project (Desktop Chrome, 1280x720, no hasTouch)

- Appended 'desktop' project entry after 'pixel' in playwright.config.ts projects array
- Uses devices['Desktop Chrome'] with serviceWorkers: 'block' (D-02/Pitfall 15)
- No baseURL override — inherited from top-level use block (D-08)
- Updated file header jsdoc: three-profile matrix, added --project=desktop example

apps/pwa/playwright.config.ts

@@ -1,15 +1,16 @@
 /**
- * Playwright configuration — Phase 7 Mobile Test Harness
+ * Playwright configuration — Phase 7 Mobile Test Harness + Phase 14 Desktop
  *
- * Two-profile device matrix: iPhone 14/WebKit + Pixel 7/Chromium
+ * Three-profile device matrix: iPhone 14/WebKit + Pixel 7/Chromium + Desktop Chrome
  * Auth: DEV_AUTH_BYPASS=true on the API (never storageState — D-01/Pitfall 14)
- * SW: serviceWorkers: 'block' on both profiles (D-02/Pitfall 15)
+ * SW: serviceWorkers: 'block' on all profiles (D-02/Pitfall 15)
  * baseURL: env-driven PLAYWRIGHT_BASE_URL (D-08/Rule 8)
  * webServer: manages Vite only — API+MariaDB+Redis stay compose-managed (D-10)
  *
  * Run:
  *   pnpm --filter @familysync/pwa test:e2e
  *   pnpm --filter @familysync/pwa exec playwright test --project=pixel
+ *   pnpm --filter @familysync/pwa exec playwright test --project=desktop
  */
 import { defineConfig, devices } from '@playwright/test';
 
@@ -52,6 +53,14 @@ export default defineConfig({
         serviceWorkers: 'block',
       },
     },
+    {
+      // Desktop Chrome: 1280×720 viewport, Chromium engine, no hasTouch (D-06)
+      name: 'desktop',
+      use: {
+        ...devices['Desktop Chrome'],
+        serviceWorkers: 'block',
+      },
+    },
   ],
 
   // D-10: manage Vite only; API+MariaDB+Redis are compose-managed