Configure the package to compile TypeScript and copy SCSS files to dist/
before publishing, rather than publishing raw source files. This allows
us to use tsc-alias for @src imports.
Also use a more modern export map to decouple the internal file
structure from the package's API, and add a build step to CI.
BREAKING CHANGE: Consuming projects may need to update their imports or
SASS @use lines.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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