Enhancements: Dark Mode Support, Customizable Button and Calendar

[moshOntong-IT]

This pull request includes several significant improvements to the user interface of the application.

1. Dark Mode Support: The application now fully supports dark mode, enhancing usability in low-light environments and providing users with more options for personalizing their app experience.

2. Customizable Button: The button component has been revamped to offer greater customizability. Developers now have more control over the appearance of buttons, enabling them to better align with the app's overall design aesthetic and user experience.

3. Customizable Calendar: The calendar component has been updated to offer enhanced customizability. This update provides developers with the ability to tailor the calendar's appearance to better suit the app's design and functional requirements.

These enhancements contribute to an improved user experience and provide developers with greater flexibility when integrating these components into their apps. All changes have been thoroughly tested to ensure functionality and usability.

[moshOntong-IT]

I have updated the example folder so that you can see the changes I added here a Theme mode button at appbar actions

[moshOntong-IT]

@radikris i need your approval for this