VoIP will no longer appear as the first app on the homepage. Its position has been adjusted to appear after WhatsApp, making the app ordering more intentional and less prominent for users who do not need VoIP first.

Change the sequence number of the VoIP root menu so that it doesn't show up as the first app on the homepage.

The sequence number is set to 261 in order to put VoIP right after WhatsApp, which is 260 at the time.

The Sign app receives small interface refinements to make sending and managing signature requests smoother. These updates help users navigate common signing workflows more comfortably without changing the core process.

## Purpose

Improvements to the user experience when using the sign application.

## Specification

Minor tweaks to the UI of sign

Task: 4306332

Signing fields no longer use a blurred background over the document content. This makes the document easier to read while users review and complete signature items.

With this PR, the sign items no longer have a background that blurs what is underneath.

Task: 4984615

This update adds automated tests for Enterprise Point of Sale custom behavior, helping ensure these workflows keep working as expected. It reduces the risk of regressions in preparation displays, sessions, and related configuration when future changes are made.

This commit adds hoot tests for the overriden methods of point_of_sale in the pos_enterprise module.

taskId: 4945820

Forward-Port-Of: odoo/enterprise#90758

The rental website checkout has been updated to match recent changes in the cart summary layout. This helps keep the shopping cart experience consistent and prevents display issues for customers renting products online.

The cart summary now uses a separate template, so related templates need to be updated accordingly.

Community PR:  
- https://github.com/odoo/odoo/pull/215859

task-4761121