Improvement: Add link to the nested GARAN label

### Technical TODO

The EU has already used this approach several times in its own examples within the guidelines. I therefore personally expect it to become the standard for online shops that clicking the nested GARAN label itself opens the modal, rather than requiring users to click an additional link displayed underneath it.

To ensure a consistent implementation across all Shopware pages — for example the cart, checkout, and other relevant storefront views — I would recommend making the nested label itself clickable and using it to open the corresponding modal.

No files or tests are named. Start by locating the nested GARAN label and its modal in the storefront cart, checkout, and other relevant views; then trace how the existing link opens the modal. Done means the nested label itself opens the corresponding modal consistently across all Shopware pages.

Written by the indexing model from the issue text.