fix: show recording state on first click, fix error state via WS

frontend/app.js

@@ -55,7 +55,9 @@ function setStatus(status) {
 btn.addEventListener('click', async () => {
   const r = await apiFetch('/toggle', { method: 'POST' });
   const data = await r.json();
-  if (data.action === 'reset') {
+  if (data.action === 'started') {
+    setStatus('recording');
+  } else if (data.action === 'reset') {
     preview.textContent = 'Noch keine Aufnahme verarbeitet.';
     preview.classList.remove('has-content');
     setStatus('idle');
@@ -78,7 +80,7 @@ function connectWs() {
       loadTranscripts();
     }
     if (msg.event === 'error') {
-      setStatus('idle');
+      setStatus('error');
       preview.textContent = `Fehler: ${msg.message}`;
     }
   };