✨ Shut down button for streamlit app

[enryH]

Relevant especially for GUI application.

• see https://discuss.streamlit.io/t/close-streamlit-app-with-button-click/35132/5

[Copilot]

Pull Request Overview

This PR implements a shutdown button for the Streamlit app by adding a new sidebar button that, when clicked, terminates the app process.

• Integrated a shutdown button in the navigation panel.
• Refactored multi-line strings using textwrap.dedent for clarity.
• Added an encoding parameter when writing the navigation script.

Comments suppressed due to low confidence (2)

src/vuegen/streamlit_reportview.py:168

• Consider adding tests to verify that the shutdown functionality is triggered as expected when the button is clicked.

                    if exit_app:

src/vuegen/streamlit_reportview.py:174

• Consider handling potential exceptions from process termination or using p.kill() if an immediate shutdown is required, and possibly following up with a verification step to ensure the process terminates successfully.

                        p.terminate()

[enryH]

This is ready?

[sayalaruano]

Yes, I think it's ready