- Introduced a new function `applyThemeParamsToCss` to map Telegram theme parameters to CSS variables, improving theme customization.
- Updated the `applyTheme` function to utilize the new theme parameters and set background/header colors accordingly.
- Added a favicon to the project by linking `favicon.png` in `index.html`.
- Modified CSS for the light theme to use CSS variables for better flexibility and maintainability.
- Enhanced styling for light theme elements, including container borders and calendar sticky behavior.
