Test the @std/oauth library using Playwright MCP tools.

• Val Town MCP server access
• Playwright MCP tools (mcp__playwright__*)

mcp__playwright__browser_navigate({
  url: "https://std--91178458b42e11f0b6f30224a6c84d84.web.val.run"
});

mcp__playwright__browser_click({ 
  element: "Log in link", 
  ref: "e5" 
});

Expected: Redirects to Val Town OAuth authorization page

mcp__playwright__browser_click({ 
  element: "Allow button", 
  ref: "e18" 
});

Expected: Redirects back to app, shows "Logged in as: [username]"

Navigate to home page again - should still be logged in.

mcp__playwright__browser_click({ 
  element: "Log out link", 
  ref: "e6" 
});

Expected: Returns to logged out state

• OAuth authorization flow
• Session cookie creation
• User data from ID token
• Encrypted sessions
• Logout

• Sessions last 30 days
• User data stored in encrypted cookie
• No database required