FEAT: Added Tracing for user selections

Enhance app.py and utils.py with improved variant selection and logging features; update final_arrangement.json to include volume automation and curve types for sections; modify .gitignore to exclude .env files and additional log patterns.

Update progress messages in app.py and utils.py for clarity during section variant generation

Refactor section configuration to load from final_arrangement.json and update finalise function to map section names to keys

Load environment variables using dotenv in app.py and add pandas to requirements.txt

Refactor TEMP_DIR assignment to use tempfile.mkdtemp() for creating a temporary directory

Implement initial project structure and setup