Redesign Video Brain: Step 1=Enter URL, Step 2=Auto-analyze, Step 3=Ask follow-up questions

Add transcript paste feature for Video Brain - users can paste transcript directly

Add YouTube transcript extraction, improve Video Brain with follow-up questions, fix all modes

Fix Video Brain URL handling, add API health check, improve error diagnostics

Fix backend URL for Hugging Face deployment, improve startup health check

Fix: Video Brain auto-load URL and Enter key submit

Fix: Tavily API format and Streamlit image compatibility

Add Product MVP and Video Brain modes + Render deployment

Add Docker and Azure deployment configuration

Perplexity AI Clone - Full Production Version with 8 Modes