Sync GUI from GitHub: tutorial, default placeholders, help links

Update src/pages/04_Final_Overview.py

Improve login UI design - cleaner, centered layout

Improve OAuth login button visibility and error handling

Implement Hugging Face OAuth for user-specific session caching

Add session management, OAuth support, and Hugging Face login checks

updated gui

correct gui code

Duplicate from streamlit/streamlit-template-space