Update app.py

"Added voice input feature to chat interface, including backend route and frontend UI changes"

"Updated import statements to use `langchain_community` instead of `langchain` for `llms` and `document_loaders` modules."

"Updated .env file with new API tokens, refactored app.py to include CORS, added question suggestion feature, and modified templates/chat.html with new styles and layout."

Update app.py

Update app.py

replicate error

fixed coloring

new style

first commit