The mail module has been reorganized so more display-related behavior is handled in shared models rather than individual interface components. This should make future improvements to chat, calls, and messaging screens easier to deliver while keeping the current user experience largely unchanged.

This commit moves code from components to models, by introduce some models and fields.

It also cleans a few things in models, like:
- use `Timer` model instead of `setTimeout`
- replace local variables by model fields

Task-2881075

Enterprise: https://github.com/odoo/enterprise/pull/28274

The VoIP module was adjusted to stay compatible with recent internal messaging changes in Odoo. This helps keep VoIP behavior stable for users after the underlying chatter component lifecycle was updated.

Task-2881075

Community: https://github.com/odoo/odoo/pull/93330