Export CSS file in package.json

[Copilot]

The package builds dist/tooling.ui.kit.css but doesn't expose it in the exports field, causing module resolution failures in consuming applications.

Changes

• Added CSS file export to package.json exports field

"exports": {
  ".": {
    "import": "./dist/tooling-ui-kit.es.js",
    "require": "./dist/tooling-ui-kit.umd.js"
  },
  "./dist/tooling.ui.kit.css": "./dist/tooling.ui.kit.css"
}

This allows consumers to import the stylesheet:

import '@sw-consulting/tooling.ui.kit/dist/tooling.ui.kit.css'

Original prompt

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This section details on the original issue you should resolve

<issue_title>Library installation issue</issue_title>
<issue_description>https://github.com/sw-consulting/media-pi.ui/actions/runs/20078071897/job/57597679684#step:8:32</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Library installation issue #12

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