test: 起 Playwright(electron) E2E 骨架 + 金标准往返测试（建→写→存→重开字节一致）

apps/desktop/package.json

@@ -7,7 +7,8 @@
   "scripts": {
     "dev": "electron-vite dev",
     "build": "electron-vite build",
-    "typecheck": "tsc -b"
+    "typecheck": "tsc -b",
+    "test:e2e": "electron-vite build && playwright test"
   },
   "dependencies": {
     "@hunter/shared": "workspace:*",
@@ -39,11 +40,13 @@
     "zustand": "^5.0.15"
   },
   "devDependencies": {
+    "@playwright/test": "^1.62.1",
     "@types/node": "^20.0.0",
     "@types/react": "^18.3.0",
     "@types/react-dom": "^18.3.0",
     "electron": "^30.0.0",
     "electron-vite": "^2.3.0",
+    "playwright": "^1.62.1",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
     "typescript": "^5.6.0",