feat(07-01): add playwright.config.ts with two-profile device matrix

- Two projects: iphone/WebKit (iPhone 14) + pixel/Chromium (Pixel 7)
- serviceWorkers: 'block' on both profiles per D-02/Pitfall 15
- env-driven baseURL via PLAYWRIGHT_BASE_URL (D-08/Rule 8)
- globalSetup ref to e2e/global-setup.ts (Plan 02 implements)
- webServer manages vite only with reuseExistingServer (D-10)
- no storageState, no toHaveScreenshot per D-01/UI-SPEC Rule 6
- add e2e/global-setup.ts placeholder (stub) so config path resolves

apps/pwa/e2e/global-setup.ts

@@ -0,0 +1,15 @@
+/**
+ * global-setup.ts — Phase 7 Plan 02 will implement this
+ *
+ * Placeholder to satisfy Playwright config path resolution.
+ * Plan 02 replaces this with:
+ *   - health poll on baseURL/health (D-08 readiness gate)
+ *   - mysql2 DB seed: TRUNCATE + INSERT onto calendar id=10 + lists for user 1 (D-05/D-06/D-07)
+ *
+ * Run:
+ *   pnpm --filter @familysync/pwa test:e2e
+ */
+
+export default async function globalSetup(): Promise<void> {
+  // Implemented in Plan 02
+}