Update requirements.txt and README.md with current dependencies and correct entry point

Co-authored-by: tmaier-kettering <109093855+tmaier-kettering@users.noreply.github.com>

Author: Copilot

README.md

@@ -37,7 +37,7 @@ pip install -r requirements.txt
 ### 1. First Launch
 Run the application:
 ```bash
-python ui/main_window.py
+python main.py
 ```
 
 ### 2. Configure API Key
@@ -110,7 +110,7 @@ text
 ### Settings Options
 
 - **API Key**: Your OpenAI API key (stored securely)
-- **Model**: AI model to use (default: o3)
+- **Model**: AI model to use (default: gpt-4o)
 - **Max Batches**: Number of recent batches to display (default: 4)
 - **Timezone**: Timezone for displaying batch creation times
 

requirements.txt

@@ -1,28 +1,25 @@
 # CodebookAI Dependencies
+# Requires Python 3.9+ with tkinter support
 
 # Core AI/ML libraries
 openai>=1.100.0          # OpenAI API client for text classification
 pandas>=2.0.0            # Data manipulation and analysis
-
-# GUI framework (typically installed with Python)
-# tkinter is part of Python standard library
+pydantic>=2.0.0          # Data validation and settings management
 
 # System integration
 keyring>=25.0.0          # Secure credential storage across platforms
 
-# Type hints support (Python < 3.10)
-typing-extensions>=4.0.0  # Enhanced type annotations
+# Type hints support for older Python versions
+typing-extensions>=4.0.0  # Enhanced type annotations (backport features)
 
-# Additional dependencies that may be needed
-# These are automatically installed with the above packages but listed for clarity:
-# - pydantic (data validation, from openai)
+# Note: The following are included automatically with the above packages:
 # - httpx (HTTP client, from openai)
 # - numpy (numerical computing, from pandas)
 # - python-dateutil (date utilities, from pandas)
 # - pytz (timezone handling, from pandas)
 
-# Development note:
-# This application also requires Python 3.9+ with tkinter support
-# On Ubuntu/Debian: sudo apt install python3-tk
-# On CentOS/RHEL: sudo yum install tkinter
-# On macOS/Windows: tkinter is included with Python
+# System Dependencies:
+# GUI framework tkinter is part of Python standard library but may need separate installation:
+# Ubuntu/Debian: sudo apt update && sudo apt install python3-tk
+# CentOS/RHEL: sudo yum install tkinter  
+# macOS/Windows: tkinter is included with Python installations