QA: unit tests for API logic, Playwright smoke tests, pre-push check, manual QA checklist

Co-authored-by: Cursor <cursoragent@cursor.com>

package-lock.json

@@ -11,6 +11,9 @@
         "apps/*",
         "packages/*"
       ],
+      "devDependencies": {
+        "@playwright/test": "^1.64.0"
+      },
       "engines": {
         "node": ">=20"
       },
@@ -933,6 +936,22 @@
         "tslib": "^2.1.0"
       }
     },
+    "node_modules/@playwright/test": {
+      "version": "1.64.0",
+      "resolved": "https://registry.npmmirror.com/@playwright/test/-/test-1.64.0.tgz",
+      "integrity": "sha512-oTN9FNYuN6bqQMwiho6jJKLCG2/QOYCixGXuCjRmzOq23eODeukuY2XiAVoVpAECbuezMt1MHQjAiQxK8F+Y+g==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "playwright": "1.64.0"
+      },
+      "bin": {
+        "playwright": "cli.js"
+      },
+      "engines": {
+        "node": ">=20"
+      }
+    },
     "node_modules/@prisma/client": {
       "version": "6.19.3",
       "hasInstallScript": true,
@@ -4427,6 +4446,35 @@
         "pathe": "^2.0.3"
       }
     },
+    "node_modules/playwright": {
+      "version": "1.64.0",
+      "resolved": "https://registry.npmmirror.com/playwright/-/playwright-1.64.0.tgz",
+      "integrity": "sha512-kVzTnYFYEyQ9RGzBjNCd2+yEqWmVbxl3AHPynv3qQ6JTjv4a+kwRcnqQwIpuP3NnrnIrE/Q6wWAIAvMfIE2/Yg==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "playwright-core": "1.64.0"
+      },
+      "bin": {
+        "playwright": "cli.js"
+      },
+      "engines": {
+        "node": ">=20"
+      }
+    },
+    "node_modules/playwright-core": {
+      "version": "1.64.0",
+      "resolved": "https://registry.npmmirror.com/playwright-core/-/playwright-core-1.64.0.tgz",
+      "integrity": "sha512-T9r+MZkTECl2+oUcZ26YgZzTrYidTsIhYYkJix+6iDOymOb1FB2RLLSOxRGnZGv5DStt+aduIVbt+E8WygXYpg==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "playwright-core": "cli.js"
+      },
+      "engines": {
+        "node": ">=20"
+      }
+    },
     "node_modules/pluralize": {
       "version": "8.0.0",
       "dev": true,