Rental-related error messages on the website have been updated to use a more consistent visual style. This improves clarity for customers when they encounter invalid rental dates or options during the online shopping process.

Prior to this commit, invalid messages were not consistent. This commit adapts the style of these messages to achieve a consistent visual result.

Requires:
- https://github.com/odoo/enterprise/pull/50364

task-3586525

Several enterprise apps were updated to stay compatible with recent changes in Odoo's shared app framework. This keeps screens such as invoicing, Knowledge, point of sale displays, Sign, and the home menu working consistently after the platform update.

We adapt the enterprise code to the changes brought by https://github.com/odoo/odoo/pull/149217.