Introduced a `.hidden` CSS class to control the visibility of elements
and initially applied it to the error box, making it hidden by default.
JavaScript logic was added to remove this class dynamically, allowing
for the error box to be shown conditionally based on specific criteria.
This change enhances user experience by preventing immediate display of
error messages on page load, instead allowing for dynamic visibility
control based on application state or user actions.
This commit sets up webpack as the module bundler along with
configurations for transforming ES6+ code using Babel and compiling SASS
into CSS. It includes necessary dependencies such as `babel-loader`,
`sass-loader`, `css-loader`, `style-loader`, and plugins like
`mini-css-extract-plugin` to extract CSS into separate files. This setup
facilitates the development of a modern web application by enabling the
use of the latest JavaScript features and streamlined CSS
pre-processing.
