fix(02): CSS-safe occurrence ids + error boundary to surface render errors

Schedule-X rejects ids containing ':' '[' ']' (the old ${uid}::${iso} form) — mint ev-<uid>-<epochMs> instead. Add an ErrorBoundary so a render throw shows the error instead of a blank page.

apps/pwa/src/main.tsx

@@ -12,6 +12,7 @@ import React from 'react'
 import ReactDOM from 'react-dom/client'
 import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
 import App from './App.js'
+import { ErrorBoundary } from './components/ErrorBoundary.js'
 
 const queryClient = new QueryClient({
   defaultOptions: {
@@ -25,7 +26,9 @@ const queryClient = new QueryClient({
 ReactDOM.createRoot(document.getElementById('root')!).render(
   <React.StrictMode>
     <QueryClientProvider client={queryClient}>
-      <App />
+      <ErrorBoundary>
+        <App />
+      </ErrorBoundary>
     </QueryClientProvider>
   </React.StrictMode>,
 )