feat: Replace custom voice pipeline with ElevenLabs Conversational AI

[amethystani]

Summary

• Eliminates 2-6 second voice agent latency by replacing the custom 3-hop pipeline (Browser Speech Recognition → Groq LLM → TTS Service) with ElevenLabs Conversational AI
• Uses @elevenlabs/react SDK's useConversation hook which handles STT + LLM + TTS in a single real-time WebSocket connection with sub-second response times
• Removes all custom speech recognition, AI service routing, and multi-provider TTS logic from the call interface — zero custom code, just the real ElevenLabs endpoint

What changed

• Installed @elevenlabs/react (v0.14.1), replacing the deprecated @11labs/client (v0.0.4)
• Rewrote UserPhoneInterface.tsx to use useConversation hook instead of the manual STT → LLM → TTS pipeline
• Kept the existing UI (call controls, visual feedback, transcript captions, avatar animations)
• Kept the signed URL Netlify function (/api/elevenlabs-signed-url) for secure API key handling

Before vs After

	Before	After
Architecture	Browser Speech API → Groq LLM → TTS (Groq/ElevenLabs/DeAPI)	ElevenLabs WebSocket (all-in-one)
Latency	2-6 seconds	Sub-second
Custom code	~500 lines of speech recognition, AI routing, TTS orchestration	~50 lines wiring the SDK hook to UI

Test plan

• Navigate to /user/call and start a voice call
• Verify microphone permission prompt appears
• Speak and confirm sub-second AI responses
• Verify transcripts appear for both user and agent
• Test mute/unmute speaker toggle
• Test end call button
• Test back button navigation
• Verify no console errors during conversation

🤖 Generated with Claude Code

[netlify]

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