URL Parameter Test

# URL Parameter Extraction Test

## Test Instructions:

To test URL parameter extraction and Base64 decoding, add parameters to the URL:

- Test with simple code parameter
- Test with Base64 code parameter ("test code")
- Test with Base64 code parameter ("Hello World")
- Test with Base64 ZenUML code
- Test with multiple parameters
- Test with invalid Base64 (should fallback)
- Test with no code parameter

### Base64 Encoding Helper:

Enter text to encode as Base64:

Base64 result: