Add boot phase status messages

src/frontend/src/main.ts

@@ -8,6 +8,8 @@ function setBootStatus(message: string): void {
   document.getElementById('boot-status')!.textContent = message;
 }
 
+setBootStatus('Starting frontend bundle...');
+
 window.addEventListener('error', (event) => {
   setBootStatus(`Frontend error: ${event.message || 'unknown'}`);
 });
@@ -16,11 +18,17 @@ window.addEventListener('unhandledrejection', (event) => {
   setBootStatus(`Frontend rejection: ${String(event.reason || 'unknown')}`);
 });
 
+const bootTimeout = window.setTimeout(() => {
+  setBootStatus('Bootstrap still running...');
+}, 3000);
+
 bootstrapApplication(AppComponent, appConfig)
   .then(() => {
+    window.clearTimeout(bootTimeout);
     document.getElementById('boot-status')?.remove();
   })
   .catch((err) => {
+    window.clearTimeout(bootTimeout);
     console.error(err);
     setBootStatus(`Bootstrap failed: ${String(err)}`);
   });