feat: show errors direclty under the input

Improve error handling for coupon code input. Added a catch block to handle errors when adding a coupon code to the basket. The error message is now displayed directly under the input field, providing a better user experience.

Related: #20 (closed)

Closes #20 (closed)

mentioned in commit 7e22532c

merged

This MR is included in version 2.2.0

The release is available on GitLab release.

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