This update adjusts how WhatsApp-related screens are connected to the underlying Odoo interface so they remain compatible with recent layout changes. It is a minor maintenance improvement that helps keep the WhatsApp feature working reliably without changing business workflows.

This update improves explanatory notes in the code for mail-related features, making future maintenance easier for developers. It does not change how users interact with the system, but supports ongoing work on email-like chatter flows.

Just fixing / improving some docstrings while passing by.

Part of Task-4273479 : [mail] Email-like chatter flow