fix: correct WebSocket setup and audio format for Gemini Live API

- Setup message uses "config" key (not "setup")
- Audio sent as realtimeInput.audio (not mediaChunks)
- Added message logging for debugging

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

src/components/configurator/VoiceAgentProvider.tsx

@@ -278,14 +278,12 @@ export default function VoiceAgentProvider({ locale, children }: VoiceAgentProvi
       wsRef.current = ws;
 
       ws.onopen = () => {
-        // Send setup message with config
+        // Send setup message — must use "config" key per Gemini Live API spec
         ws.send(JSON.stringify({
-          setup: {
+          config: {
             model: `models/${model}`,
-            generationConfig: {
-              responseModalities: config.responseModalities,
-              speechConfig: config.speechConfig,
-            },
+            responseModalities: config.responseModalities,
+            speechConfig: config.speechConfig,
             systemInstruction: {
               parts: [{ text: config.systemInstruction }],
             },
@@ -300,7 +298,10 @@ export default function VoiceAgentProvider({ locale, children }: VoiceAgentProvi
           const base64 = arrayBufferToBase64(event.data.data.int16arrayBuffer);
           ws.send(JSON.stringify({
             realtimeInput: {
-              mediaChunks: [{ mimeType: 'audio/pcm;rate=16000', data: base64 }],
+              audio: {
+                data: base64,
+                mimeType: 'audio/pcm;rate=16000',
+              },
             },
           }));
         }
@@ -308,9 +309,11 @@ export default function VoiceAgentProvider({ locale, children }: VoiceAgentProvi
 
       ws.onmessage = async (event) => {
         const msg = JSON.parse(event.data as string);
+        console.log('[VoiceAgent] Message:', JSON.stringify(msg).slice(0, 200));
 
-        // Setup complete
-        if (msg.setupComplete) {
+        // Setup complete — Gemini sends back a setupComplete message
+        if (msg.setupComplete !== undefined) {
+          console.log('[VoiceAgent] Setup complete, session active');
           setStatus('active');
           trackAmplitude();
           return;