The Send and Print flow now lets users continue even when a customer or partner has no email address, instead of automatically opening the partner edit form. This reduces interruptions and gives users control over whether they want to review or update partner details before sending documents.

When you open a Send and Print dialog, if the partner had no email, then the form to edit the partner appears.
We're removing this behaviour and let the user decide if he wants to check the partners or not

![image](https://github.com/odoo/odoo/assets/1665365/440b0c1b-ce4e-411a-b82b-5d67104c4a0a)

Customers now see warning messages returned while adding products to the cart, such as availability or ordering issues. This helps shoppers understand why an item may not be added or why cart contents changed, reducing confusion and support requests.

When adding items to the cart, the server returns warnings that are never displayed to the customer. This commit makes use of the new notification system of website_sale to display it.

task-3502911