sync: update from private repo (d8074a7)

ui/src/main.tsx

@@ -2,8 +2,13 @@ import { createRoot } from 'react-dom/client';
 import { QueryClientProvider } from '@tanstack/react-query';
 import { App } from './App';
 import { queryClient } from './lib/queryClient';
+import { initTheme } from './lib/theme';
 import './index.css';
 
+// Keep [data-theme] in sync with the OS while pref is 'system'. The initial
+// attribute is already set pre-paint by the inline script in index.html.
+initTheme();
+
 createRoot(document.getElementById('root')!).render(
   <QueryClientProvider client={queryClient}>
     <App />