Update to playwright

{
  "official": [
    {
      "name": "playwright",
      "source": "./external_plugins/playwright",
      "category": "testing",
      "homepage": "https://github.com/anthropics/claude-plugins-public/tree/main/external_plugins/playwright",
      "description": "Browser automation and end-to-end testing MCP server by Microsoft. Enables Claude to interact with web pages, take screenshots, fill forms, click elements, and perform automated browser testing workflows."
    }
  ]
}