[IMP] website_sale: ability to set a cover (or other building block) in /shop/category/X

This commit closes #29045

addons/website_sale/models/product.py

@@ -68,6 +68,7 @@ class ProductPublicCategory(models.Model):
     # buttons have consistent styling.
     # In this case, the default image is set by the js code.
     image = fields.Binary(attachment=True, help="This field holds the image used as image for the category, limited to 1024x1024px.")
+    website_description = fields.Html('Category Description', sanitize_attributes=False, translate=html_translate)
     image_medium = fields.Binary(string='Medium-sized image', attachment=True,
                                  help="Medium-sized image of the category. It is automatically "
                                  "resized as a 128x128px image, with aspect ratio preserved. "

addons/website_sale/views/templates.xml

@@ -203,6 +203,9 @@
                     <div class="row mt-3">
                         <div class="d-none" id="products_grid_before"></div>
                         <div class="col-lg-12" id="products_grid">
+                            <div t-if="category" class="mb16" id="category_header">
+                                <div t-field="category.website_description"/>
+                            </div>
                             <table width="100%">
                                 <tbody>
                                     <tr t-ignore="true">