Setup Script Needs Error Handling and Better User Experience

## Current Behavior
The current setup script (`setup.sh`) has several limitations:
1. Uses incorrect virtual environment deactivation (`source deactivate`)
2. No error handling for failed operations
3. No feedback during installation steps
4. No dependency checking before running
5. Lacks proper security practices (unquoted variables)
6. No clear indication of success or failure

## Desired Behavior
The setup script should:
- Properly activate and deactivate virtual environments
- Provide clear feedback for each step of the installation
- Handle errors gracefully and exit with helpful messages
- Check for required dependencies before starting
- Follow shell scripting best practices
- Give users clear indication of success/failure
- Use color coding for better readability

## Technical Details
### Areas Needing Improvement
1. Virtual Environment Management
```bash
# Current (incorrect):
source deactivate

# Should be:
deactivate
```

2. Error Handling
```bash
# Need to add:
set -e
# Plus proper error checking for each operation
```

3. Dependency Checking
```bash
# Need checks for:
- python3
- git
- wget
```

## Impact
This improvement will:
- Reduce setup failures
- Make troubleshooting easier
- Improve user experience
- Make the script more maintainable
- Prevent partial/incomplete installations

## Acceptance Criteria
- [ ] Script exits on any error with helpful message
- [ ] All required dependencies are checked before starting
- [ ] Virtual environment is properly activated and deactivated
- [ ] User receives clear feedback for each step
- [ ] Failed operations provide meaningful error messages
- [ ] Successful completion is clearly indicated
- [ ] Code follows shell scripting best practices