fix: add detailed error logging to voice agent for debugging

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/configurator/VoiceAgentProvider.tsx

@@ -243,7 +243,7 @@ export default function VoiceAgentProvider({ locale, children }: VoiceAgentProvi
         body: JSON.stringify({ locale }),
       });
       const tokenData = await tokenRes.json();
-      if (!tokenData.success) throw new Error('Token generation failed');
+      if (!tokenData.success) throw new Error(`Token generation failed: ${tokenData.error ?? tokenRes.status}`);
 
       const { apiKey, model, config } = tokenData;
 
@@ -353,22 +353,26 @@ export default function VoiceAgentProvider({ locale, children }: VoiceAgentProvi
         }
       };
 
-      ws.onerror = () => {
+      ws.onerror = (e) => {
+        console.error('[VoiceAgent] WebSocket error:', e);
         setStatus('error');
         setErrorMessage('Connection error. Please try again.');
       };
 
-      ws.onclose = () => {
+      ws.onclose = (e) => {
+        console.log('[VoiceAgent] WebSocket closed:', e.code, e.reason);
         if (status === 'active') {
           setStatus('idle');
         }
       };
     } catch (error) {
+      console.error('[VoiceAgent] Start failed:', error);
       setStatus('error');
       if (error instanceof DOMException && error.name === 'NotAllowedError') {
         setErrorMessage('Microphone access was denied.');
       } else {
-        setErrorMessage('Failed to start conversation. Please try again.');
+        const msg = error instanceof Error ? error.message : 'Unknown error';
+        setErrorMessage(`Failed to start: ${msg}`);
       }
     }
   }, [locale, trackAmplitude, handleToolCall, playAudioChunk, addTranscript, status]);