This function checks if the required Python package (ladybug)
is available in the user's reticulate environment. If the package is missing,
it provides a clear, actionable message guiding the user on how to install it manually.
This function checks if the required Python package (ladybug)
is available in the user's reticulate environment. If the package is missing,
it provides a clear, actionable message guiding the user on how to install it manually.