This internal cleanup changes how VoIP call updates refresh related conversation information, routing the process through the VoIP communication system. It should help keep the feature easier to maintain without changing day-to-day user workflows.

Part of task-3265211

https://github.com/odoo/odoo/pull/129583

The Point of Sale customer and payment screens were adjusted to stay compatible with recent platform updates. This helps keep localized POS workflows, including Chilean and Mexican e-invoicing and due-settlement payments, working smoothly after the refactor.