refine: remove no-op reportWebVitals from playground

CHANGELOG.md

@@ -47,6 +47,11 @@
 
 **Web**:
 
+- The playground no longer depends on `web-vitals`. `reportWebVitals` was called
+  with no argument, and its body is guarded on that argument being a function —
+  so the dynamic `import("web-vitals")` inside it never ran. It was Create React
+  App boilerplate that outlived the migration to Vite. (@prql-bot, #6233)
+
 **Integrations**:
 
 - The `prqlc` Python package now declares `requires-python = ">=3.10"`. Python

web/playground/package.json

@@ -22,7 +22,6 @@
     "react": "^19.2.0",
     "react-dom": "^19.2.0",
     "react-syntax-highlighter": "^16.1.0",
-    "web-vitals": "^6.1.0",
     "yaml": "^2.9.0"
   },
   "devDependencies": {

web/playground/src/main.jsx

@@ -3,16 +3,10 @@ import ReactDOM from "react-dom/client";
 import "./index.css";
 import "./highlight.css";
 import App from "./app/App";
-import reportWebVitals from "./reportWebVitals";
 
 const root = ReactDOM.createRoot(document.getElementById("root"));
 root.render(
   <React.StrictMode>
     <App />
   </React.StrictMode>,
 );
-
-// If you want to start measuring performance in your app, pass a function
-// to log results (for example: reportWebVitals(console.log))
-// or send to an analytics endpoint. Learn more: https://bit.ly/CRA-vitals
-reportWebVitals();