chore: remove unused service worker cleanup

web/src/main.tsx

@@ -3,16 +3,6 @@ import { createRoot } from 'react-dom/client'
 import './index.css'
 import App from './App.tsx'
 
-// This app has no service worker of its own, but browsers that visited this origin before the
-// redesign/desktop-multicolumn rewrite may still have the old one registered (see
-// public/service-worker.js) -- force an immediate update check rather than waiting for the
-// browser's own lazy schedule, so it gets replaced by the kill switch right away.
-if ('serviceWorker' in navigator) {
-  navigator.serviceWorker.getRegistrations().then(regs => {
-    regs.forEach(reg => reg.update())
-  })
-}
-
 createRoot(document.getElementById('root')!).render(
   <StrictMode>
     <App />