Webpack: new scss files are not handled correctly

Right now, adding a new .scss file requires manually creating and committing a corresponding `.scss.d.ts` for the TypeScript definitions.

Ideally, the `.scss.d.ts` should be auto-generated including for brand new `.scss` files when they are first added. There are webpack plugins and build tools available to assist with this missing step.

Start by locating the Webpack configuration and the current handling of .scss and .scss.d.ts files. Check how existing SCSS declarations are generated, then verify that adding a brand-new .scss file produces its corresponding TypeScript definition without manual creation.

Written by the indexing model from the issue text.