chore(07-01): install @playwright/test@1.60.0, add test:e2e scripts

- Add @playwright/test@1.60.0 to apps/pwa devDependencies (pinned, not floated)
- Install WebKit and Chromium browser engines via playwright install
- Add test:e2e, test:e2e:ui, test:e2e:headed scripts to apps/pwa/package.json
- Add root workspace test:e2e delegate script to package.json

apps/pwa/package.json

@@ -8,7 +8,10 @@
     "build": "tsc && vite build",
     "preview": "vite preview",
     "typecheck": "tsc --noEmit",
-    "test": "vitest run"
+    "test": "vitest run",
+    "test:e2e": "playwright test",
+    "test:e2e:ui": "playwright test --ui",
+    "test:e2e:headed": "playwright test --headed"
   },
   "dependencies": {
     "@dnd-kit/core": "^6.3.1",
@@ -31,6 +34,7 @@
     "zustand": "5.0.14"
   },
   "devDependencies": {
+    "@playwright/test": "1.60.0",
     "@testing-library/jest-dom": "^6.6.3",
     "@testing-library/react": "^16.3.0",
     "@types/react": "^19.0.0",