In the ajax/frontend/basket/toOrderInProcess.php:
- The QUI\ERP\Order\Factory class was imported.
- In the event of an exception, a new order in process is created instead of just logging the
error. This change should improve the user experience by preventing any disruption in the order
process due to unexpected errors.

Improve readability and interpretability of code by explicitly stating null in union types. This
change has been applied across multiple files and functions.

PHP8.4 compatibility

Added a conditional check in src/QUI/ERP/Order/Basket/Basket.php to convert basketId to actual id
from user's session if it is a boolean value. This fixes potential issues that may arise with
non-integer basketIds.

Also, introduced a safeguard check before saving to ensure there is a valid User. If not, the save
function is exited early to prevent potential errors or undesired actions.

Changed the default value of paymentId status in the paymentChangeable list from 1 to 0 to ensure
accurate payment status representation.

Related: #176

Related: #174

Related: order-guestorder#6

Related: order-guestorder#6

For orders this is not needed. the internal instance cache causes more problems
due to the mix between uuid and id cache. the internal cache on uuid / id was therefore removed.
Orders have the data freshly fetched from the db anyway. therefore unnecessary.
In addition, a wrong order object was repeatedly retrieved when sending mail.

Related: quiqqer/order#163

Orders have not taken over the customer id.

Related: pcsg/buero#453

The UX was not optimal as a result. It was not clear that you could scroll and the guest order button was not visible.
For now flex removed and the login buttons are below each other