- Add trailing commas to button name parameters in widgets
- Reformat constructor definitions for consistency
- Clean up unnecessary whitespace in widget render logic
- Introduced the default_selected parameter in the Radio widget
- Updated Radio widget to mark default selected option visually
- Removed TODO comment for the default_selected implementation
- Form and TextEditor classes now accept submit_button_name and cancel_button_name
- Widget's chatmark header updated with customizable submit and cancel labels
- Adjusted initialization of Checkbox and Radio classes with button label parameters
