03f4134190
- Introduced UserMessage widget for displaying user input with a styled prompt. - Updated onboarding steps to include UI backend selection (Rich CLI or Textual TUI). - Modified EvoScientistConfig to store selected UI backend. - Enhanced configuration handling to support UI backend environment variable. - Updated README with new UI backend options and commands. - Added tests for new UI backend functionality and UserMessage widget. - Removed obsolete test files and ensured existing tests are updated accordingly.